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Equity-Based Compensation Plans Equity-Based Compensation Plans Summary of Status of Outstanding RSU Awards (Details) (Restricted stock units, USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Restricted stock units
     
Number of share      
Beginning Balance 169,344 437,272 849,512
Granted 52,294 23,138 32,428
Vested (155,177) (286,486) (425,556)
Forfeited (2,734) (4,580) (19,112)
Ending Balance 63,727 169,344 437,272
Weighted Average Grant Date Fair Value      
Beginning Balance $ 11.33 $ 6.96 $ 7.04
Granted $ 34.59 $ 38.42 $ 24.23
Vested $ 8.82 $ 6.88 $ 8.42
Forfeited $ 34.07 $ 8.64 $ 7.14
Ending Balance $ 35.57 $ 11.33 $ 6.96
Aggregate intrinsic value      
Aggregate intrinsic value $ 2,496 $ 6,030 $ 17,119