Quarterly report pursuant to Section 13 or 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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Real Estate Properties [Line Items]        
Total revenues $ 157,517 $ 146,158 $ 459,667 $ 448,440
Depreciation and amortization (48,117) (44,099) (134,639) (127,266)
Operating income (loss) 27,931 (139,310) 82,528 (84,949)
Impairments   (164,176)   (164,176)
Realized gains/unrealized Losses on disposition (17,053) 18,718 68,664 53,261
Net income (loss) available to common shareholders (8,541) (126,892) 102,043 (94,034)
Disposal Group, Not Discontinued Operations [Member]        
Real Estate Properties [Line Items]        
Total revenues 1,854 12,934 20,048 47,583
Operating and other expenses (1,709) (7,273) (13,374) (25,488)
Depreciation and amortization (2,979) (7,798) (11,590) (20,061)
Interest expense (625) (1,241) (2,011) (6,621)
Operating income (loss) (3,459) (3,378) (6,927) (4,587)
Impairments   (61,891)   (61,891)
Realized gains/unrealized Losses on disposition 7,340 18,718 93,057 53,261
Net income (loss) available to common shareholders $ 3,881 $ (46,551) $ 86,130 $ (13,217)