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Share Incentive Plans - Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Compensation information |  |  |
Compensation Expense | $ 23,174 | $ 24,449 | $ 27,132
Compensation Capitalized | 1,527 | 1,450 | 1,218
Restricted Units In-Lieu of Bonus | 1,743 | 3,266 | 4,418
Compensation Equity | 26,444 | 29,165 | 32,768
Dividends Incurred | 3,027 | 1,804 | 1,717
Restricted Shares [Member] |  |  |
Compensation information |  |  |
Compensation Expense | 10,053 | 11,522 | 7,406
Compensation Capitalized | 1,172 | 916 | 852
Restricted Units In-Lieu of Bonus | 0 | 0 | 0
Compensation Equity | 11,225 | 12,438 | 8,258
Dividends Incurred | 1,172 | 979 | 754
Restricted Stock Units (RSUs) [Member] |  |  |
Compensation information |  |  |
Compensation Expense | 10,103 | 9,905 | 12,310
Compensation Capitalized | 80 | 240 | 36
Restricted Units In-Lieu of Bonus | 1,743 | 3,265 | 1,663
Compensation Equity | 11,926 | 13,410 | 14,009
Dividends Incurred | 1,855 | 825 | 963
Options [Member] |  |  |
Compensation information |  |  |
Compensation Expense | 2,156 | 2,420 | 6,683
Compensation Capitalized | 193 | 254 | 296
Restricted Units In-Lieu of Bonus | 0 | 1 | 2,755
Compensation Equity | 2,349 | 2,675 | 9,734
Dividends Incurred | 0 | 0 | 0
Employee Share Purchase Plan Discount [Member] |  |  |
Compensation information |  |  |
Compensation Expense | 862 | 602 | 733
Compensation Capitalized | 82 | 40 | 34
Restricted Units In-Lieu of Bonus | 0 | 0 | 0
Compensation Equity | 944 | 642 | 767
Dividends Incurred | $ 0 | $ 0 | $ 0

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