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Earnings Per Common Share - Computation Of Basic And Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | [1] | Jun. 30, 2015 | [1] | Mar. 31, 2015 | [1] | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units of Partnership Interest, Amount | 0 |  |  |  |  | 0 |  |  |  |  |  |  |  | 0 | 0 |
Income (loss) from continuing operations |  |  |  |  |  | $ 2,309 |  | $ 3,658 |  | $ 1,368 |  | $ (2,265) |  | $ 89,187 | $ 5,070 | $ (193)
Allocation of undistributed earnings to unvested restricted share awards and units to continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  | 269 | (5) | 0
Adjusted income (loss) from continuing operations attributable to the controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  | 89,471 | 5,075 | (193)
Income from discontinued operations, including gain on sale of real estate, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 106,531 | 37,539
Less: Net loss attributable to noncontrolling interests in subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  | (553) | (38) | 0
Allocation of undistributed earnings to unvested restricted share awards and units to discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (322) | (415)
Adjusted income from discontinued operations attributable to the controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 106,247 | 37,124
Adjusted net income attributable to the controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 89,471 | $ 111,322 | $ 36,931
Weighted average shares outstanding – basic |  |  |  |  |  |  |  |  |  |  |  |  |  | 68,177,000 | 66,795,000 | 66,580,000
Employee stock options and restricted share awards |  |  |  |  |  |  |  |  |  |  |  |  |  | 133,000 | 42,000 | 0
Weighted average shares outstanding - diluted |  |  |  |  |  |  |  |  |  |  |  |  |  | 68,310,000 | 66,837,000 | 66,580,000
Continuing operations - basic (in dollars per share) |  |  |  |  |  | $ 0.03 | [1] | $ 0.05 | [1] | $ 0.02 | [1] | $ (0.04) | [1] | $ 1.31 | $ 0.08 | $ 0.00
Discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00 | 1.59 | 0.55
Basic earnings: Adjusted net income attributable to the controlling interests - Per Share Amount | $ 0.91 | [1] | $ 0.01 | $ (0.04) | $ 0.43 | 0.03 | [1] | 0.05 | [1] | 0.02 | [1] | 1.56 | [1] | 1.31 | 1.67 | 0.55
Continuing operations - diluted (in dollars per share) |  |  |  |  |  | 0.03 | [1] | 0.05 | [1] | 0.02 | [1] | (0.04) | [1] | 1.31 | 0.08 | 0.00
Discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00 | 1.59 | 0.55
Net income per share, Diluted | $ 0.91 | [1] | $ 0.01 | $ (0.04) | $ 0.43 | $ 0.03 | [1] | $ 0.05 | [1] | $ 0.02 | [1] | $ 1.56 | [1] | 1.31 | 1.67 | 0.55
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.20 | $ 1.20 | $ 1.20
Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: Net loss attributable to noncontrolling interests in subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 553 |  |
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: Net loss attributable to noncontrolling interests in subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38 | $ 0
[1] | With regard to per share calculations, the sum of the quarterly results may not equal full year results due to rounding.

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