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Share-Based Compensation - Summary of Activity of the Outstanding Share-Based Compensation Awards (Details)
9 Months Ended
Sep. 30, 2016
$ / shares
shares
Restricted Stock  
Summary of activity of the outstanding share-based compensation awards  
Beginning Balance, Shares | shares 279,217
Granted, Shares | shares 75,250
Vested, Shares | shares (73,280)
Forfeited, Shares | shares (12,747)
Ending Balance, Shares | shares 268,440
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 $ 25.65
Granted, Weighted-Average Grant Date Fair Value | $ / shares 27.13
Vested, Weighted-Average Grant Date Fair Value | $ / shares 26.77
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 24.85
Ending Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 25.80
Performance Unit Incentive Plan (“PUP”)  
Summary of activity of the outstanding share-based compensation awards  
Beginning Balance, Shares | shares 231,165
Granted, Shares | shares 104,084
Vested, Shares | shares (73,188)
Forfeited, Shares | shares (6,556)
Ending Balance, Shares | shares 255,505
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 $ 26.15
Granted, Weighted-Average Grant Date Fair Value | $ / shares 26.88
Vested, Weighted-Average Grant Date Fair Value | $ / shares 27.35
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 25.84
Ending Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 26.11
Restricted Stock Units  
Summary of activity of the outstanding share-based compensation awards  
Beginning Balance, Shares | shares 16,447
Granted, Shares | shares 5,500
Vested, Shares | shares (5,965)
Forfeited, Shares | shares 0
Ending Balance, Shares | shares 15,982
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 $ 25.69
Granted, Weighted-Average Grant Date Fair Value | $ / shares 26.98
Vested, Weighted-Average Grant Date Fair Value | $ / shares 27.18
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 0
Ending Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 25.58