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Share and Unit-Based Plans: Compensation (Details) - USD ($) $ in Thousands	12 Months Ended
	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

X

- 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
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-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

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- Definition

Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, 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
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-Name Accounting Standards Codification
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-Subparagraph (h)(1)(ii)
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Unrecognized cost of unvested share-based compensation awards.

+ References

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-Topic 718
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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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