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Share and Unit-Based Plans: Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share and unit-based plans |  |  |
Compensation cost under share and unit-based plans | $ 34,375 | $ 34,873 | $ 28,122
Capitalized share and unit-based compensation costs | 6,008 | 5,410 | 3,915
Stock awards |  |  |
Share and unit-based plans |  |  |
Compensation cost under share and unit-based plans | 252 | 365 | 497
Unrecognized compensation cost of share and unit-based plans | 20 |  |
Stock units |  |  |
Share and unit-based plans |  |  |
Compensation cost under share and unit-based plans | 6,041 | 4,689 | 3,839
Unrecognized compensation cost of share and unit-based plans | 3,488 |  |
LTIP units |  |  |
Share and unit-based plans |  |  |
Compensation cost under share and unit-based plans | 26,622 | 28,598 | 22,778
Unrecognized compensation cost of share and unit-based plans | 4,128 |  |
Stock awards and units |  |  |
Share and unit-based plans |  |  |
Fair value of equity-based awards vested during period | 8,794 | 4,685 | 3,516
Stock options |  |  |
Share and unit-based plans |  |  |
Compensation cost under share and unit-based plans | 16 | 16 | 16
Unrecognized compensation cost of share and unit-based plans | 27 |  |
Phantom stock units |  |  |
Share and unit-based plans |  |  |
Compensation cost under share and unit-based plans | $ 1,444 | $ 1,205 | $ 992

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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=6415400&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=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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