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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
3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted stock units
       
Number of share        
Beginning Balance 169,344 63,727 169,344 437,272
Granted   72,702 52,294 23,138
Vested (288,336) (30,190) (155,177) (286,486)
Forfeited   (3,581) (2,734) (4,580)
Ending Balance   102,658 63,727 169,344
Weighted Average Grant Date Fair Value        
Beginning Balance $ 11.33 $ 35.57 $ 11.33 $ 6.96
Granted   $ 43.44 $ 34.59 $ 38.42
Vested   $ 39.21 $ 8.82 $ 6.88
Forfeited   $ 42.03 $ 34.07 $ 8.64
Ending Balance   $ 39.85 $ 35.57 $ 11.33
Aggregate intrinsic value        
Aggregate intrinsic value   $ 5,390 $ 2,496 $ 6,030