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Stock Awards Stock Awards - Restricted Stock Unit Table (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Weighted-Average Grant Date Fair Value  
Weighted-Average Remaining Contractual Term 9 years 4 months 26 days
Restricted Stock Units (RSUs) [Member]
 
Shares Outstanding  
Non-vested shares units beginning balance 0
Granted 1,470,072
Vested 0
Forfeited (12,202)
Non-vested shares units ending balance 1,457,870
Expected to vest 1,399,510
Weighted-Average Grant Date Fair Value  
Weighted-Average Grant Date Fair Value, Outstanding, Beginning Balance, usd per share 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 17.02
Weighted-Average Grant Date Fair Value, Vested, usd per share 0
Weighted-Average Grant Date Fair Value, Repurchased, usd per share 31.97
Weighted-Average Grant Date Fair Value, Outstanding, Ending Balance, usd per share 16.89
Aggregate Intrinsic Value, vested 0
Aggregate Intrinsic Value, Non-vested 43,780
Aggregated Intrinsic Value, Expected to vest 42,027