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Stock-Based Compensation Plans Stock Performance Rights (Details) - Stock Performance Rights - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average estimated value of SPRs outstanding (per share) $ 9.82    
Valuation assumptions:      
Expected volatility, minimum, percent 33.90%    
Expected volatility, maximum, percent 57.20%    
Risk-free rate of return, minimum 0.20%    
Risk-free rate of return, maximum 1.70%    
Expected annual dividend $ 0    
Allocated Share-based Compensation Expense $ 900,000 $ 5,500,000 $ 1,400,000
Number of SPRs      
Outstanding on December 31, 2014 644,691    
Granted 409,373    
Exercised (64,300)    
Cancelled (30,265)    
Outstanding on December 31, 2015 959,499 644,691  
Exercisable on December 31, 2015 462,725    
Weighted Average Exercise Price      
Outstanding on December 31, 2014 $ 14.50    
Granted 28.17    
Exercised 11.88    
Cancelled 33.34    
Outstanding on December 31, 2015 19.91 $ 14.50  
Exercisable on December 31, 2015 $ 14.04    
SPRs outstanding, intrinsic value $ 6,300,000    
Total unrecognized compensation cost $ 2,000,000    
Exercised 204,325    
Unrecognized cost, period for recognition 1 year 9 months 18 days    
Vested in period, fair value $ 1,900,000    
Weighted average remaining contractual term, SPRs outstanding 5 years 4 months 24 days    
Weighted average remaining contractual term, SPRs exercisable 4 years 7 months 6 days    
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Life of award 7 years    
Award vesting period 1 year    
Valuation assumptions:      
Expected term 2 months 12 days    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Life of award 10 years    
Award vesting period 3 years    
Valuation assumptions:      
Expected term 4 years 6 months