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Share and Unit-Based Plans - Narrative (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended |  | 6 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 Stock units | Jun. 30, 2014 LTIP Units | Jun. 30, 2014 Stock awards | Jun. 30, 2014 Stock options | Jun. 30, 2014 Phantom stock units | Mar. 07, 2014 Executive Officer LTIP Units | Dec. 31, 2013 Executive Officer LTIP Units executive_officer | Jun. 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) |  |  |  |  | 70,389 |  | 589,443 |  | 0 |  |  | 7,451 |  | 246,471 | 70,042 |  | 272,930
Number of executives receiving grants (in executive officers) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |
Average grant date fair value (in dollars per share) |  |  |  |  | $ 60.23 | [1] | $ 53.18 | [1] | $ 0.00 | [1] |  | $ 61.78 | [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 | $ 519 | $ 650 | $ 4,361 | $ 2,088 |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost of share and unit-based plans |  |  |  |  | $ 4,173 |  | $ 9,682 |  | $ 416 |  | $ 51 | $ 896 |  |  |  |  |
[1] | Value represents the weighted average grant date fair value.

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments, Other than Options, Conversion Rate + References No definition available. + Details
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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 No definition available. + Details
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- Definition Represents the number of executives officers receiving a grant of share-based payment awards under the plan. + References No definition available. + Details
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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 + Details
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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 + Details
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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 + Details
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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 -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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