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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Compensation information |  |  |
Compensation Expense | $ 24,997 | $ 30,530 | $ 34,607
Compensation Capitalized | 1,076 | 2,726 | 2,948
Restricted Units In-Lieu of Bonus | 1,809 | 4,022 | 3,654
Compensation Equity | 27,882 | 37,278 | 41,209
Dividends Incurred | 1,502 | 14,256 | 2,779
Restricted Shares [Member] |  |  |
Compensation information |  |  |
Compensation Expense | 9,209 | 13,539 | 13,755
Compensation Capitalized | 568 | 1,477 | 1,311
Restricted Units In-Lieu of Bonus | 0 | 0 | 0
Compensation Equity | 9,777 | 15,016 | 15,066
Dividends Incurred | 761 | 6,494 | 1,160
Restricted Stock Units (RSUs) [Member] |  |  |
Compensation information |  |  |
Compensation Expense | 10,214 | 13,567 | 17,311
Compensation Capitalized | 119 | 591 | 538
Restricted Units In-Lieu of Bonus | 190 | 4,022 | 3,654
Compensation Equity | 10,523 | 18,180 | 21,503
Dividends Incurred | 741 | 7,762 | 1,619
Employee Stock Option [Member] |  |  |
Compensation information |  |  |
Compensation Expense | 4,893 | 2,839 | 2,746
Compensation Capitalized | 323 | 593 | 1,010
Restricted Units In-Lieu of Bonus | 1,619 | 0 | 0
Compensation Equity | 6,835 | 3,432 | 3,756
Dividends Incurred | 0 | 0 | 0
Employee Share Purchase Plan Discount [Member] |  |  |
Compensation information |  |  |
Compensation Expense | 681 | 585 | 795
Compensation Capitalized | 66 | 65 | 89
Restricted Units In-Lieu of Bonus | 0 | 0 | 0
Compensation Equity | 747 | 650 | 884
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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11149-113907 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11178-113907 + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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