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Stock-Based Compensation - Schedule of RSU and PRSU Award Activity (Details)
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Stock-based compensation expenses (restricted share units (“RSUs”) and performance-based RSUs (“PRSUs”)), before income taxes  
RSUs and PRSUs, Nonvested, Number of Shares [Roll Forward]  
Non-vested as of December 31, 2018 | shares 1,723,980
Non-vested as of June 30, 2019 | shares 2,061,001
RSUs and PRSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted Average Grant Date Fair Value, Non-Vested, as of December 31, 2018 ($ per share) | $ / shares $ 22.39
Weighted Average Grant Date Fair Value, Non-Vested, as of June 30, 2019 ($ per share) | $ / shares $ 22.05
Restricted Stock Units (RSUs)  
RSUs and PRSUs, Nonvested, Number of Shares [Roll Forward]  
Granted | shares 828,274
Vested | shares (584,870)
Forfeitures | shares (31,009)
RSUs and PRSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted Average Grant Date Fair Value, Grants ($ per share) | $ / shares $ 21.57
Weighted Average Grant Date Fair Value, Vested ($ per share) | $ / shares 21.99
Weighted Average Grant Date Fair Value, Forfeited ($ per share) | $ / shares $ 22.23
Performance Restricted Stock Units (PRSUs)  
RSUs and PRSUs, Nonvested, Number of Shares [Roll Forward]  
Granted | shares 376,418
Vested | shares (246,542)
Forfeitures | shares (5,250)
RSUs and PRSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted Average Grant Date Fair Value, Grants ($ per share) | $ / shares $ 21.41
Weighted Average Grant Date Fair Value, Vested ($ per share) | $ / shares 21.99
Weighted Average Grant Date Fair Value, Forfeited ($ per share) | $ / shares $ 22.17