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Share-Based Compensation - Summary of Liability Based Award Activity (Details) - 6 months ended Jun. 30, 2015 - Liability Based Awards - $ / shares
Total
Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Beginning Balance, Shares 328,602
Granted, Shares 80,500
Vested, Shares (104,740)
Forfeited or Cancelled, Shares (24,130)
Ending Balance, Shares 280,232
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 $ 23.30
Granted, Weighted-Average Grant Date Fair Value 27.33
Vested, Weighted-Average Grant Date Fair Value 20.50
Forfeited or Cancelled, Weighted-Average Grant Date Fair Value 24.37
Ending Balance, Weighted-Average Grant Date Fair Value $ 25.42
Performance unit incentive plan (“PUP”)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Beginning Balance, Shares 267,120
Granted, Shares 91,100
Vested, Shares (103,555)
Forfeited or Cancelled, Shares (22,300)
Ending Balance, Shares 232,365
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 $ 23.51
Granted, Weighted-Average Grant Date Fair Value 27.31
Vested, Weighted-Average Grant Date Fair Value 20.60
Forfeited or Cancelled, Weighted-Average Grant Date Fair Value 24.92
Ending Balance, Weighted-Average Grant Date Fair Value $ 26.16
Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Beginning Balance, Shares 25,370
Granted, Shares 4,800
Vested, Shares (11,123)
Forfeited or Cancelled, Shares 0
Ending Balance, Shares 19,047
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 $ 23.17
Granted, Weighted-Average Grant Date Fair Value 27.35
Vested, Weighted-Average Grant Date Fair Value 20.61
Forfeited or Cancelled, Weighted-Average Grant Date Fair Value 0.00
Ending Balance, Weighted-Average Grant Date Fair Value $ 25.72