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Equity-Based Compensation Plans Equity-Based Compensation Plans Summary of Status of Outstanding Performance Share Awards (Details) (Performance shares, USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Performance shares
     
Number of share      
Beginning Balance 392,655 749,538 638,870
Granted 124,513 150,865 110,668
Settled (246,592) (499,680) 0
Forfeited (10,735) (8,068) 0
Ending Balance 259,841 392,655 749,538
Weighted Average Grant Date Fair Value      
Beginning Balance $ 44.67 $ 19.52 $ 13.00
Granted $ 63.46 $ 40.24 $ 57.18
Settled $ 47.19 $ 5.65 $ 0.00
Forfeited $ 54.87 $ 42.15 $ 0.00
Ending Balance $ 50.87 $ 44.67 $ 19.52
Aggregate intrinsic value      
Aggregate intrinsic value $ 13,642 $ 15,376 $ 26,691