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Long-Term Incentive Plan (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense recognized | $ 13,993 | $ 9,730 | $ 6,656
Omnibus Stock Incentive Plans, 2007 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 5 years |  |
Compensation expense recognized | $ 6,400 | $ 4,200 | $ 1,900

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