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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
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) 1,406,550 1,477,762
Granted (in shares) 390,200 467,567
Converted (in shares) (263,791) (186,179)
Expired (in shares) (1,600) (4,300)
Forfeited (in shares) 0 (17,800)
Outstanding at end of period (in shares) 1,531,359 1,737,050
Vested (in shares) 329,059 415,550
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) $ 6.21 $ 5.83
Granted, Weighted average grant-date fair value (in dollars per share) 9.61 7.52
Converted, Weighted average grant-date fair value (in dollars per share) 6.42 7.50
Expired, Weighted average grant-date fair value (in dollars per share) 10.11 7.64
Forfeited, Weighted average grant-date fair value (in dollars per share) 0.00 6.26
Outstanding at end of period, Weighted average grant-date fair value (in dollars per share) 7.04 6.10
Vested (in dollars per share) $ 5.61 $ 5.28
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Share-based compensation expense $ 1.6 $ 1.3
Unrecognized share-based compensation expense $ 4.4  
Unrecognized share-based compensation, weighted average recognition period 1 year 6 months  
Restricted Stock [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, 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) $ 9.22  
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  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 0.90%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 41.50%  
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) $ 10.99  
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) 9.22  
Time-Based Awards [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) $ 9.22  
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) 1,837,409  
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) 329,059  
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