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Share-based Compensation Unrecognized Compensation Expense for Share-Based Awards (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Unrecognized compensation expense | $ 40,447
Remaining weighted-average recognition period | 3 years
Restricted Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Unrecognized compensation expense | 33,901
Remaining weighted-average recognition period | 2 years 10 months 24 days
Performance Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Unrecognized compensation expense | $ 6,546
Remaining weighted-average recognition period | 3 years 7 months 6 days

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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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Namespace Prefix: | us-gaap_
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Period Type: | instant

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration