Annual report pursuant to Section 13 and 15(d)

Commitments And Contingencies (Roseland Contingent Consideration) (Narrative) (Details)

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Commitments And Contingencies (Roseland Contingent Consideration) (Narrative) (Details) - USD ($)
 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
Oct. 23, 2012
Business Acquisition, Contingent Consideration [Line Items]                        
(Increase) decrease in accounts receivable, net                 $ 2,178,000 $ (355,000) $ (248,000)  
Interest and other investment income $ 231,000 $ 5,000 $ 291,000 $ 267,000 $ 1,399,000 $ 908,000 $ 922,000 $ 386,000        
Roseland Partners, L.L.C. [Member]                        
Business Acquisition, Contingent Consideration [Line Items]                        
Fair value of contingent consideration $ 0               0     $ 10,000,000
Benefit related to change in fair value of Earn Out liability                 219,000      
Interest and other investment income                   $ 1,500,000 $ 2,300,000  
Purchase accounting adjustments                 $ 0      
Completion/Start Of Certain Developments [Member] | Minimum [Member]                        
Business Acquisition, Contingent Consideration [Line Items]                        
Probability of occurrence 92.00%               92.00%      
Completion/Start Of Certain Developments [Member] | Maximum [Member]                        
Business Acquisition, Contingent Consideration [Line Items]                        
Probability of occurrence 99.00%               99.00%      
Obtaining Of Tax Credits/Grants [Member]                        
Business Acquisition, Contingent Consideration [Line Items]                        
Probability of occurrence 50.00%               50.00%