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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
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Compensation information |  |  |
Compensation Expense | $ 27,132 | $ 24,997 | $ 30,530
Compensation Capitalized | 1,218 | 1,076 | 2,726
Restricted Units In-Lieu of Bonus | 4,418 | 1,809 | 4,022
Compensation Equity | 32,768 | 27,882 | 37,278
Dividends Incurred | 1,717 | 1,502 | 14,256
Restricted Shares [Member] |  |  |
Compensation information |  |  |
Compensation Expense | 7,406 | 9,209 | 13,539
Compensation Capitalized | 852 | 568 | 1,477
Restricted Units In-Lieu of Bonus | 0 | 0 | 0
Compensation Equity | 8,258 | 9,777 | 15,016
Dividends Incurred | 754 | 761 | 6,494
Restricted Stock Units (RSUs) [Member] |  |  |
Compensation information |  |  |
Compensation Expense | 12,310 | 10,214 | 13,567
Compensation Capitalized | 36 | 119 | 591
Restricted Units In-Lieu of Bonus | 1,663 | 190 | 4,022
Compensation Equity | 14,009 | 10,523 | 18,180
Dividends Incurred | 963 | 741 | 7,762
Employee Stock Option [Member] |  |  |
Compensation information |  |  |
Compensation Expense | 6,683 | 4,893 | 2,839
Compensation Capitalized | 296 | 323 | 593
Restricted Units In-Lieu of Bonus | 2,755 | 1,619 | 0
Compensation Equity | 9,734 | 6,835 | 3,432
Dividends Incurred | 0 | 0 | 0
Employee Share Purchase Plan Discount [Member] |  |  |
Compensation information |  |  |
Compensation Expense | 733 | 681 | 585
Compensation Capitalized | 34 | 66 | 65
Restricted Units In-Lieu of Bonus | 0 | 0 | 0
Compensation Equity | 767 | 747 | 650
Dividends Incurred | $ 0 | $ 0 | $ 0

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- Definition Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=109196918&loc=d3e11149-113907 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109196918&loc=d3e11178-113907 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=79507207&loc=d3e4534-113899 + Details
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