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Share and Unit-Based Plans - Compensation Cost (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Share and unit-based plans |  |  |  |
Compensation cost under share and unit-based plans | $ 4,854 | $ 5,731 | $ 25,200 | $ 10,868
LTIP Units |  |  |  |
Share and unit-based plans |  |  |  |
Compensation cost under share and unit-based plans | 3,428 | 4,692 | 21,668 | 7,650
Stock awards |  |  |  |
Share and unit-based plans |  |  |  |
Compensation cost under share and unit-based plans | 83 | 122 | 197 | 232
Stock units |  |  |  |
Share and unit-based plans |  |  |  |
Compensation cost under share and unit-based plans | 1,039 | 667 | 2,721 | 2,491
Stock options |  |  |  |
Share and unit-based plans |  |  |  |
Compensation cost under share and unit-based plans | 4 | 4 | 8 | 8
Phantom stock units |  |  |  |
Share and unit-based plans |  |  |  |
Compensation cost under share and unit-based plans | $ 300 | $ 246 | $ 606 | $ 487

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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 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 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=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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