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Stock-Based Compensation - Performance Share Awards (Details) (Performance Shares Awards [Member], USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Performance Shares Awards [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Potential vesting percentage, minimum 0.00%  
Potential vesting percentage, maximum 200.00%  
Period for share issuance after vesting 60 days  
Expected dividend yield 0.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Outstanding (in shares) 280,907  
Granted (in shares) 126,147  
Vested (in shares) 0  
Forfeited (in shares) (79,950)  
Outstanding (in shares) 327,104 280,907
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Outstanding, weighted-average grant date fair value (in dollars per share) $ 20.30  
Granted, weighted-average grant date fair value (in dollars per share) $ 28.09  
Vested, weighted-average grant date fair value (in dollars per share) $ 0.00  
Forfeited, weighted-average grant date fair value (in dollars per share) $ 21.76  
Outstanding, weighted-average grant date fair value (in dollars per share) $ 22.94 $ 20.30
Total compensation cost not yet recognized $ 6,500,000 $ 6,900,000
Total compensation cost not yet recognized, period for recognition 1 year 6 months 14 days 2 years