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Share-Based Compensation - Summary of Liability Based Award Activity (Details) (Liability Based Awards, USD $)
6 Months Ended
Jun. 30, 2014
Performance unit incentive plan (PUP)
 
Summary of Liability-Based Award Activity [Roll Forward]  
Beginning Balance, Shares 299,768
Granted, Shares 123,300
Vested, Shares (94,600)
Forfeited or Cancelled, Shares (2,700)
Ending Balance, Shares 325,768
Beginning Balance, Weighted-Average Grant Date Fair Value $ 23.46
Granted, Weighted-Average Grant Date Fair Value $ 23.71
Vested, Weighted-Average Grant Date Fair Value $ 23.01
Forfeited or Cancelled, Weighted-Average Grant Date Fair Value $ 27.35
Ending Balance, Weighted-Average Grant Date Fair Value $ 23.65
Restricted Stock (RSU)
 
Summary of Liability-Based Award Activity [Roll Forward]  
Beginning Balance, Shares 430,899
Granted, Shares 83,300
Vested, Shares (133,637)
Forfeited or Cancelled, Shares (14,540)
Ending Balance, Shares 366,022
Beginning Balance, Weighted-Average Grant Date Fair Value $ 22.78
Granted, Weighted-Average Grant Date Fair Value $ 23.95
Vested, Weighted-Average Grant Date Fair Value $ 22.67
Forfeited or Cancelled, Weighted-Average Grant Date Fair Value $ 21.87
Ending Balance, Weighted-Average Grant Date Fair Value $ 23.13
Performance Based Restricted Stock Shares (PBRSU)
 
Summary of Liability-Based Award Activity [Roll Forward]  
Beginning Balance, Shares 28,560
Granted, Shares 6,700
Vested, Shares (9,890)
Forfeited or Cancelled, Shares (500)
Ending Balance, Shares 24,870
Beginning Balance, Weighted-Average Grant Date Fair Value $ 22.91
Granted, Weighted-Average Grant Date Fair Value $ 24.95
Vested, Weighted-Average Grant Date Fair Value $ 23.45
Forfeited or Cancelled, Weighted-Average Grant Date Fair Value $ 27.32
Ending Balance, Weighted-Average Grant Date Fair Value $ 23.16