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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Compensation information |  |  |
Compensation Expense | $ 24,449 | $ 27,132 | $ 24,997
Compensation Capitalized | 1,450 | 1,218 | 1,076
Restricted Units In-Lieu of Bonus | 3,266 | 4,418 | 1,809
Compensation Equity | 29,165 | 32,768 | 27,882
Dividends Incurred | 1,804 | 1,717 | 1,502
Restricted Shares [Member] |  |  |
Compensation information |  |  |
Compensation Expense | 11,522 | 7,406 | 9,209
Compensation Capitalized | 916 | 852 | 568
Restricted Units In-Lieu of Bonus | 0 | 0 | 0
Compensation Equity | 12,438 | 8,258 | 9,777
Dividends Incurred | 979 | 754 | 761
Restricted Stock Units (RSUs) [Member] |  |  |
Compensation information |  |  |
Compensation Expense | 9,905 | 12,310 | 10,214
Compensation Capitalized | 240 | 36 | 119
Restricted Units In-Lieu of Bonus | 3,265 | 1,663 | 190
Compensation Equity | 13,410 | 14,009 | 10,523
Dividends Incurred | 825 | 963 | 741
Options [Member] |  |  |
Compensation information |  |  |
Compensation Expense | 2,420 | 6,683 | 4,893
Compensation Capitalized | 254 | 296 | 323
Restricted Units In-Lieu of Bonus | 1 | 2,755 | 1,619
Compensation Equity | 2,675 | 9,734 | 6,835
Dividends Incurred | 0 | 0 | 0
Employee Share Purchase Plan Discount [Member] |  |  |
Compensation information |  |  |
Compensation Expense | 602 | 733 | 681
Compensation Capitalized | 40 | 34 | 66
Restricted Units In-Lieu of Bonus | 0 | 0 | 0
Compensation Equity | 642 | 767 | 747
Dividends Incurred | $ 0 | $ 0 | $ 0

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