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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Outstanding at beginning of period (in shares) 1,040,569 1,157,659
Granted (in shares) 243,940 294,060
Converted (in shares) (173,210) (160,500)
Expired (in shares) 0 0
Forfeited (in shares) (3,800) 0
Outstanding at end of period (in shares) 1,107,499 1,291,219
Vested (in shares) 324,599 338,919
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Outstanding at beginning of period, Weighted average grant-date fair value (in dollars per share) $ 9.97 $ 7.52
Granted, Weighted average grant-date fair value (in dollars per share) 17.52 15.43
Converted, Weighted average grant-date fair value (in dollars per share) 9.69 7.20
Expired, Weighted average grant-date fair value (in dollars per share) 0.00 0.00
Forfeited, Weighted average grant-date fair value (in dollars per share) 13.66 0.00
Outstanding at end of period, Weighted average grant-date fair value (in dollars per share) 11.66 9.37
Vested (in dollars per share) $ 6.39 $ 6.12
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Share-based compensation expense $ 0.8 $ 0.7
Unrecognized share-based compensation expense $ 6.5  
Unrecognized share-based compensation, weighted average recognition period 1 year 10 months  
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Requisite service period 3 years  
Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Requisite service period 3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Historical volatility period 3 years  
Risk-free interest rate 1.70%  
Expected volatility rate 34.70%  
Market Condition Award [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Granted, Weighted average grant-date fair value (in dollars per share) $ 20.18  
Performance Condition Award [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Granted, Weighted average grant-date fair value (in dollars per share) $ 16.72  
Time-Based Awards [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Number of additional outstanding shares issued (in shares) 1,360,474  
Director [Member] | Time-Based Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Vested (in shares) 324,599  
Director [Member] | Time-Based Awards [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Requisite service period 6 months  
Director [Member] | Time-Based Awards [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Requisite service period 12 months