Annual report pursuant to Section 13 and 15(d)

Recent Transactions (Summary Of Income (Loss) From Properties Disposed) (Details)

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Recent Transactions (Summary Of Income (Loss) From Properties Disposed) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Real Estate Properties [Line Items]                      
Total revenues $ 146,443 $ 146,158 $ 148,567 $ 153,715 $ 151,414 $ 155,489 $ 160,300 $ 169,596 $ 594,883 $ 636,799 $ 667,031
Depreciation and amortization (43,136) (44,099) (42,365) (40,802) (40,811) (41,983) (44,711) (44,985) (170,402) (172,490) (182,766)
Interest expense                     (118)
Income (loss) from properties disposed of (11,383) (139,310) 27,353 27,008 16,553 29,534 29,557 13,167 (96,332) 88,811 33,595
Impairments (33,743) [1] (164,176) [1]             (197,919)   (110,853)
Realized gains on dispositions   18,718 34,399 144   264 54,584   53,261 54,848  
Total Income from properties disposed of $ (31,718) $ (126,892) $ 35,379 $ (2,521) $ (9,240) $ 1,982 $ 51,123 $ (15,298) (125,752) 28,567 (14,909)
Disposal Group, Not Discontinued Operations [Member]                      
Real Estate Properties [Line Items]                      
Total revenues                 9,137 53,975 79,379
Operating and other expenses                 (5,532) (24,311) (34,835)
Depreciation and amortization                 (11,700) (9,955) (20,927)
Interest expense                 (7,008) (10,369) (9,784)
Income (loss) from properties disposed of                 (15,103) 9,340 13,833
Impairments                     (79,378)
Realized gains on dispositions                 53,261 54,848  
Total Income from properties disposed of                 $ 38,158 $ 64,188 $ (65,545)
[1] Amounts for the year ended December 31, 2015 relate to impairment charges as further described in Note 3: Recent Transactions - Impairments on Properties Held and Used.