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Share-Based Compensation - Summary of Activity of the Outstanding Share-Based Compensation Awards (Details)
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Performance Unit Incentive Plan (“PUP”)  
Summary of activity of the outstanding share-based compensation awards  
Beginning Balance, Shares | shares 239,809
Granted, Shares | shares 73,020
Vested, Shares | shares (95,309)
Ending Balance, Shares | shares 217,520
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Beginning Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 40.65
Granted, Weighted-Average Grant Date Fair Value | $ / shares 58.25
Vested, Weighted-Average Grant Date Fair Value | $ / shares 26.98
Ending Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 52.55
Restricted Stock  
Summary of activity of the outstanding share-based compensation awards  
Beginning Balance, Shares | shares 176,769
Granted, Shares | shares 54,475
Vested, Shares | shares (80,859)
Forfeited, Shares | shares (936)
Ending Balance, Shares | shares 149,449
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Beginning Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 40.87
Granted, Weighted-Average Grant Date Fair Value | $ / shares 57.80
Vested, Weighted-Average Grant Date Fair Value | $ / shares 31.78
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 43.75
Ending Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 51.93
Restricted Stock Units  
Summary of activity of the outstanding share-based compensation awards  
Beginning Balance, Shares | shares 12,090
Granted, Shares | shares 5,025
Vested, Shares | shares (5,377)
Ending Balance, Shares | shares 11,738
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Beginning Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 39.04
Granted, Weighted-Average Grant Date Fair Value | $ / shares 56.81
Vested, Weighted-Average Grant Date Fair Value | $ / shares 26.98
Ending Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 52.17