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Stock-Based Compensation - Schedule of RSU and PRSU Award Activity (Details) - 6 months ended Jun. 30, 2015 - $ / shares
Total
Restricted Stock Units (RSUs)  
RSUs and PRSUs, Nonvested, Number of Shares [Roll Forward]  
Granted 419,609
Vested (458,074)
Forfeitures (19,219)
RSUs and PRSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted Average Grant Date Fair Value, Grants (per share) $ 29.64
Weighted Average Grant Date Fair Value, Vested (per share) 21.15
Weighted Average Grant Date Fair Value, Forfeited (per share) $ 25.07
Performance Restricted Stock Units (PRSUs)  
RSUs and PRSUs, Nonvested, Number of Shares [Roll Forward]  
Granted 226,197
Vested (65,669)
Forfeitures (25,751)
RSUs and PRSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted Average Grant Date Fair Value, Grants (per share) $ 29.83
Weighted Average Grant Date Fair Value, Vested (per share) 28.89
Weighted Average Grant Date Fair Value, Forfeited (per share) $ 26.42
Restricted stock units (“RSUs”) and performance-based RSUs (“PRSUs”)  
RSUs and PRSUs, Nonvested, Number of Shares [Roll Forward]  
Non-vested as of beginning of period 1,278,602
Non-vested as of end of period 1,355,695
RSUs and PRSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted Average Grant Date Fair Value, Non-Vested, Beginning Balance (per share) $ 21.92
Weighted Average Grant Date Fair Value, Non-Vested, Ending Balance (per share) $ 26.41