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Discontinued Operations (Schedule Of Properties Identified As Held For Sale) (Details) (USD $)
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12 Months Ended | |||||||||||||||||||||
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Mar. 31, 2013
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Dec. 31, 2012
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Apr. 10, 2013
19 Skyline Drive [Member]
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Dec. 31, 2012
16 And 18 Sentry Park West [Member]
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Mar. 31, 2013
Assets Held-for-sale [Member]
sqft
item
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Mar. 31, 2013
Assets Held-for-sale [Member]
19 Skyline Drive [Member]
sqft
item
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Mar. 31, 2013
Assets Held-for-sale [Member]
55 Corporate Drive [Member]
sqft
item
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Mar. 31, 2013
Assets Held-for-sale [Member]
51 Imclone Drive [Member]
sqft
item
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Mar. 31, 2013
Assets Held-for-sale [Member]
16 Sentry Park West [Member]
item
sqft
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Mar. 31, 2013
Assets Held-for-sale [Member]
18 Sentry Park West [Member]
sqft
item
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Mar. 31, 2013
Assets Held-for-sale [Member]
777 Passaic Avenue [Member]
sqft
item
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Mar. 31, 2013
Assets Held-for-sale [Member]
200 Riser Road [Member]
sqft
item
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| Long Lived Assets Held-for-sale [Line Items] | ||||||||||||||||||||||
| Number of Buildings | 7 | 1 | [1],[2] | 1 | [1] | 1 | 1 | [3] | 1 | [3] | 1 | 1 | ||||||||||
| Rentable Square Feet | 1,065,401 | 248,400 | [1],[2] | 204,057 | [1] | 63,213 | 93,093 | [3] | 95,010 | [3] | 75,000 | 286,628 | ||||||||||
| Gross Book Value | $ 149,206,000 | $ 37,798,000 | [1],[2] | $ 48,256,000 | [1] | $ 5,375,000 | $ 14,781,000 | [3] | $ 15,713,000 | [3] | $ 7,346,000 | $ 19,937,000 | ||||||||||
| Accumulated Depreciation | (38,652,000) | (14,713,000) | [1],[2] | (2,060,000) | [1] | (398,000) | (5,654,000) | [3] | (6,041,000) | [3] | (3,779,000) | (6,007,000) | ||||||||||
| Valuation Allowance | (7,080,000) | (7,080,000) | [1],[2] | |||||||||||||||||||
| Net Book Value | 103,474,000 | 60,863,000 | 103,474,000 | 16,005,000 | [1],[2] | 46,196,000 | [1] | 4,977,000 | 9,127,000 | [3] | 9,672,000 | [3] | 3,567,000 | 13,930,000 | ||||||||
| Sales proceeds | 16,000,000 | |||||||||||||||||||||
| Impairment charge | $ 8,400,000 | |||||||||||||||||||||
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| X | ||||||||||
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- Definition
Assets Held For Sale, Property Plant And Equipment, Accumulated Depreciation No definition available.
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| X | ||||||||||
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- Definition
Assets Held For Sale, Property Plant And Equipment, Gross No definition available.
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| X | ||||||||||
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- Definition
Number Of Buildings No definition available.
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| X | ||||||||||
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- Definition
Area of a real estate property. No definition available.
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| X | ||||||||||
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- Definition
Property, plant and equipment that is held for sale apart from normal operations and anticipated to be sold in less than one year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The charge against earnings in the period to reduce the carrying amount of real property to fair value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amounts received from the disposal of the long-lived asset during or after the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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