XML 61 R48.htm IDEA: XBRL DOCUMENT v3.8.0.1
Share-Based Compensation - Summary of Activity of the Outstanding Share-Based Compensation Awards (Details)
9 Months Ended
Sep. 30, 2017
$ / shares
shares
Performance Unit Incentive Plan (“PUP”)  
Summary of activity of the outstanding share-based compensation awards  
Beginning Balance, Shares | shares 255,505
Granted, Shares | shares 73,557
Vested, Shares | shares (76,082)
Forfeited, Shares | shares (5,911)
Ending Balance, Shares | shares 247,069
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 47.44
Vested, Weighted-Average Grant Date Fair Value | $ / shares 23.66
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 30.64
Ending Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 33.10
Restricted Stock  
Summary of activity of the outstanding share-based compensation awards  
Beginning Balance, Shares | shares 267,051
Granted, Shares | shares 64,648
Vested, Shares | shares (79,104)
Forfeited, Shares | shares (9,807)
Ending Balance, Shares | shares 242,788
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 46.64
Vested, Weighted-Average Grant Date Fair Value | $ / shares 24.01
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 33.84
Ending Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 31.79
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