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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Number of maximum shares available for issuance 1,375,000   1,375,000  
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     0  
Granted, shares     264,150  
Vested, shares     0  
Forfeited, shares     (5,850)  
Ending balance, shares 258,300   258,300  
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     $ 0.00  
Granted, weighted average grant date fair value     $ 18.00  
Vested, weighted average grant date fair value     $ 0.00  
Forfeited, weighted average grant date fair value     $ 18.00  
Ending balance, weighted average grant date fair value $ 18.00   $ 18.00  
Forfeiture rate     6.00%  
Unrecognized compensation expense $ 4.2   $ 4.2  
Weighted average period     3 years 9 months 18 days  
Restricted Stock Units | General and Administrative Expense
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Stock based compensation expense 0.2 0 0.2 0
Restricted Stock Units, Liability Awards
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Beginning balance, shares     0  
Granted, shares     122,000  
Vested, shares     0  
Forfeited, shares     0  
Ending balance, shares 122,000   122,000  
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     $ 0.00  
Granted, weighted average grant date fair value     $ 17.37  
Vested, weighted average grant date fair value     $ 0.00  
Forfeited, weighted average grant date fair value     $ 0.00  
Ending balance, weighted average grant date fair value $ 17.37   $ 17.37  
Unrecognized compensation expense 1.9   1.9  
Weighted average period     2 years 10 months 24 days  
Restricted Stock Units, Liability Awards | Other Current Liabilities
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Other current liabilities related to restricted stock 0.1   0.1  
Restricted Stock Units, Liability Awards | Other Noncurrent Liabilities
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Other noncurrent liabilities related to restricted stock 0.1   0.1  
Restricted Stock Units, Liability Awards | General and Administrative Expense
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Stock based compensation expense $ 0.2   $ 0.2  
Non-Employee Director | Restricted Stock Units, Liability Awards
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Award vesting period     9 months  
Officer, Employee, and Employee of Affiliates | Restricted Stock Units | Service Years, Group One
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Award vesting period     3 years  
Officer, Employee, and Employee of Affiliates | Restricted Stock Units | Service Years, Group Two
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Award vesting period     4 years