Recent Transactions (Summary Of Income (Loss) From Properties Disposed) (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2016 |
Jun. 30, 2015 |
Jun. 30, 2016 |
Jun. 30, 2015 |
|
| Real Estate Properties [Line Items] | ||||
| Total revenues | $ 149,227 | $ 148,567 | $ 302,150 | $ 302,282 |
| Depreciation and amortization | (43,459) | (42,365) | (86,522) | (83,167) |
| Operating income | 27,368 | 27,353 | 54,597 | 54,361 |
| Realized gains on disposition | 27,117 | 34,399 | 85,717 | 34,543 |
| Net income available to common shareholders | 48,393 | 35,379 | 110,584 | 32,858 |
| Disposal Group, Not Discontinued Operations [Member] | ||||
| Real Estate Properties [Line Items] | ||||
| Total revenues | 1,859 | 12,203 | 11,608 | 27,680 |
| Operating and other expenses | (2,408) | (7,490) | (8,022) | (14,281) |
| Depreciation and amortization | (3,173) | (5,641) | (7,275) | (9,994) |
| Interest expense | (665) | (2,604) | (1,386) | (5,380) |
| Operating income | (4,387) | (3,532) | (5,075) | (1,975) |
| Realized gains on disposition | 30,731 | 34,399 | 89,332 | 34,543 |
| Net income available to common shareholders | $ 26,344 | $ 30,867 | $ 84,257 | $ 32,568 |