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Share-Based Compensation - Summary of Liability Based Award Activity (Details) - Liability Based Awards
9 Months Ended
Sep. 30, 2015
$ / shares
shares
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) 82,000
Vested (shares) (105,115)
Forfeited or Cancelled (shares) (27,765)
Ending Balance (shares) 277,722
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 (USD per share) | $ / shares $ 23.30
Granted, Weighted-Average Grant Date Fair Value (USD per share) | $ / shares 27.36
Vested, Weighted-Average Grant Date Fair Value (USD per share) | $ / shares 20.52
Forfeited or Cancelled, Weighted-Average Grant Date Fair Value (USD per share) | $ / shares 24.19
Ending Balance, Weighted-Average Grant Date Fair Value (USD per share) | $ / shares $ 25.47
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 (USD per share) | $ / shares $ 23.51
Granted, Weighted-Average Grant Date Fair Value (USD per share) | $ / shares 27.31
Vested, Weighted-Average Grant Date Fair Value (USD per share) | $ / shares 20.60
Forfeited or Cancelled, Weighted-Average Grant Date Fair Value (USD per share) | $ / shares 24.92
Ending Balance, Weighted-Average Grant Date Fair Value (USD per share) | $ / shares $ 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) (11,623)
Forfeited or Cancelled (shares) 0
Ending Balance (shares) 18,547
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 (USD per share) | $ / shares $ 23.17
Granted, Weighted-Average Grant Date Fair Value (USD per share) | $ / shares 27.35
Vested, Weighted-Average Grant Date Fair Value (USD per share) | $ / shares 20.91
Forfeited or Cancelled, Weighted-Average Grant Date Fair Value (USD per share) | $ / shares 0.00
Ending Balance, Weighted-Average Grant Date Fair Value (USD per share) | $ / shares $ 25.67