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Share and Unit-based Plans - Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share and unit-based plans |  |  |
Compensation cost under share and unit-based plans | $ 37,005 | $ 40,529 | $ 34,375
Capitalized share and unit-based compensation costs | 6,206 | 7,241 | 6,008
Stock awards |  |  |
Share and unit-based plans |  |  |
Compensation cost under share and unit-based plans | 0 | 20 | 252
Stock units |  |  |
Share and unit-based plans |  |  |
Compensation cost under share and unit-based plans | 6,045 | 6,305 | 6,041
Unrecognized compensation cost of share and unit-based plans | 3,239 |  |
LTIP units |  |  |
Share and unit-based plans |  |  |
Compensation cost under share and unit-based plans | 30,161 | 32,957 | 26,622
Unrecognized compensation cost of share and unit-based plans | 286 |  |
Stock options |  |  |
Share and unit-based plans |  |  |
Compensation cost under share and unit-based plans | 85 | 16 | 16
Unrecognized compensation cost of share and unit-based plans | 176 |  |
Phantom stock units |  |  |
Share and unit-based plans |  |  |
Compensation cost under share and unit-based plans | 714 | 1,231 | 1,444
Unrecognized compensation cost of share and unit-based plans | 324 |  |
Stock awards and units |  |  |
Share and unit-based plans |  |  |
Fair value of equity-based awards vested during period | $ 5,257 | $ 5,644 | $ 8,794

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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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