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Share-Based Compensation - Summary of Activity of the Outstanding Share-Based Compensation Awards (Details)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Restricted Stock  
Summary of activity of the outstanding share-based compensation awards  
Beginning Balance, Shares | shares 328,602
Granted, Shares | shares 92,850
Vested, Shares | shares (109,050)
Forfeited, Shares | shares (33,185)
Ending Balance, Shares | shares 279,217
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 $ 23.30
Granted, Weighted-Average Grant Date Fair Value | $ / shares 27.52
Vested, Weighted-Average Grant Date Fair Value | $ / shares 20.51
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 24.51
Ending Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 25.65
Performance unit incentive plan (“PUP”)  
Summary of activity of the outstanding share-based compensation awards  
Beginning Balance, Shares | shares 267,120
Granted, Shares | shares 92,100
Vested, Shares | shares (103,555)
Forfeited, Shares | shares (24,500)
Ending Balance, Shares | shares 231,165
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 $ 23.51
Granted, Weighted-Average Grant Date Fair Value | $ / shares 27.30
Vested, Weighted-Average Grant Date Fair Value | $ / shares 20.60
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 25.23
Ending Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 26.15
Restricted stock units  
Summary of activity of the outstanding share-based compensation awards  
Beginning Balance, Shares | shares 25,370
Granted, Shares | shares 4,800
Vested, Shares | shares (11,623)
Forfeited, Shares | shares (2,100)
Ending Balance, Shares | shares 16,447
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 $ 23.17
Granted, Weighted-Average Grant Date Fair Value | $ / shares 27.35
Vested, Weighted-Average Grant Date Fair Value | $ / shares 20.91
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 25.46
Ending Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 25.69