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Share and Unit-Based Plans - Narrative (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended									9 Months Ended		0 Months Ended		9 Months Ended	0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Stock units		Sep. 30, 2014 LTIP Units		Sep. 30, 2014 Stock awards		Sep. 30, 2014 Stock options	Sep. 30, 2014 Phantom stock units		Mar. 07, 2014 Executive Officer LTIP Units executive_officer	Dec. 31, 2013 Executive Officer LTIP Units executive_officer	Sep. 30, 2014 Executive Officer LTIP Units	Dec. 31, 2013 Executive Officer Long Units, Market Indexed
Share and unit-based plans
Conversion rate of shares					1		1
Granted (in shares)					70,505		589,443		0			8,916		246,471	70,042		272,930
Number of executives receiving grants (in executive officers)														7	7
Average grant date fair value (in dollars per share)					$ 60.24	[1]	$ 53.18	[1]	$ 0.00	[1]		$ 62.53	[1]	$ 60.25	$ 58.89		$ 45.34
Absolute stockholder return requirement (as a percent)																3.00%
Look-back period (in years)							1 year
Capitalized share and unit-based compensation costs	$ 525	$ 657	$ 4,886	$ 2,745
Unrecognized compensation cost of share and unit-based plans					$ 2,870		$ 6,216		$ 332		$ 47	$ 697
[1] Value represents the weighted average grant date fair value.

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments, Other than Options, Conversion Rate

+ References

No definition available.

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- Definition

Represents the look-back period used to determine the volatilities of the returns on the price of the entity's and peer group's stocks.

+ References

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X

- Definition

Represents the number of executives officers receiving a grant of share-based payment awards under the plan.

+ References

No definition available.

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- Definition

Share Based Compensation Arrangements by Share Based Payment Award, Absolute Stockholder Return Requirement

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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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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-Paragraph 2

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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