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Share-Based Compensation - Summary of Activity of the Outstanding Share-Based Compensation Awards (Details)
6 Months Ended
Jun. 30, 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)
Forfeited, Shares | shares (488)
Ending Balance, Shares | shares 217,032
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
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 54.70
Ending Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 52.54
Restricted Stock  
Summary of activity of the outstanding share-based compensation awards  
Beginning Balance, Shares | shares 176,769
Granted, Shares | shares 55,042
Vested, Shares | shares (81,320)
Forfeited, Shares | shares (2,772)
Ending Balance, Shares | shares 147,719
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 57.82
Vested, Weighted-Average Grant Date Fair Value | $ / shares 31.79
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 49.24
Ending Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 52.02
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)
Forfeited, Shares | shares (115)
Ending Balance, Shares | shares 11,623
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
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 52.15
Ending Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 52.17