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Share-Based Compensation - Summary of Activity of the Outstanding Share-Based Compensation Awards (Details)
3 Months Ended
Mar. 31, 2017
$ / shares
shares
Restricted Stock  
Summary of activity of the outstanding share-based compensation awards  
Beginning Balance, Shares | shares 267,051
Granted, Shares | shares 55,217
Vested, Shares | shares (73,553)
Forfeited, Shares | shares (1,000)
Ending Balance, Shares | shares 247,715
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 $ 25.96
Granted, Weighted-Average Grant Date Fair Value | $ / shares 46.92
Vested, Weighted-Average Grant Date Fair Value | $ / shares 23.85
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 27.09
Ending Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 31.26
Performance Unit Incentive Plan (“PUP”)  
Summary of activity of the outstanding share-based compensation awards  
Beginning Balance, Shares | shares 255,505
Granted, Shares | shares 72,642
Vested, Shares | shares (76,082)
Forfeited, Shares | shares 0
Ending Balance, Shares | shares 252,065
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 $ 26.11
Granted, Weighted-Average Grant Date Fair Value | $ / shares 47.45
Vested, Weighted-Average Grant Date Fair Value | $ / shares 23.66
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 0
Ending Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 32.99
Restricted Stock Units  
Summary of activity of the outstanding share-based compensation awards  
Beginning Balance, Shares | shares 15,982
Granted, Shares | shares 2,950
Vested, Shares | shares (6,182)
Forfeited, Shares | shares 0
Ending Balance, Shares | shares 12,750
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 $ 25.58
Granted, Weighted-Average Grant Date Fair Value | $ / shares 47.45
Vested, Weighted-Average Grant Date Fair Value | $ / shares 25.05
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 0
Ending Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 30.90