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Equity Incentive Program - Stock Options and SSARs (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SSARs, Number of Shares (in shares):      
Forfeited 0    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Risk-free interest rate 2.59%    
Dividend yield 0.00% 0.00%  
Expected life (years) 4 years 6 months 4 years 6 months 4 years 6 months
Volatility 41.20%    
SSARs, Weighted-average grant date fair value (in dollars per share):      
Granted $ 14.34    
Stock Options, Number of Shares (in share):      
Beginning balance 4,901,739    
Granted 963,692    
Exercised (44,326)    
Forfeited (120,458)    
Expired (229,154)    
Ending balance 5,471,493 4,901,739  
Exercisable 3,517,954    
Stock Options, Weighted Average Exercise Price (in dollars per share):      
Beginning balance $ 18.36    
Granted 14.34    
Exercised 11.02    
Forfeited 15.54    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price 21.63    
Ending balance 17.64 $ 18.36  
Exercisable $ 19.31    
SARS and Options, Additional Disclosures      
Options, aggregate intrinsic value, outstanding $ 3,400    
Options, aggregate intrinsic value, exercisable $ 2,200    
Options, weighted average remaining contractual term, outstanding 4 years 1 month 6 days    
Options, weighted average remaining contractual term, exercisable 3 years 6 months    
Unrecognized compensation expense $ 5,800    
Weighted average period for compensation expense to be recognized 1 year 3 months 18 days    
SSARs and Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Dividend yield     0.00%
SSARs      
SSARs, Number of Shares (in shares):      
Beginning balance 850,516    
Granted 0    
Exercised (30,624)    
Expired (37,897)    
Ending balance 781,995 850,516  
Exercisable 781,995    
SSARs, Weighted-average grant date fair value (in dollars per share):      
Beginning balance $ 21.54    
Granted 0    
Exercised 12.26    
Forfeited 0    
Expired 22.79    
Ending balance 21.85 $ 21.54  
Exercisable 21.85    
Stock Options, Weighted Average Exercise Price (in dollars per share):      
Granted $ 0    
SARS and Options, Additional Disclosures      
SSARs, aggregate intrinsic value, outstanding $ 0    
SSARs, aggregate intrinsic value, exercisable $ 0    
SSARs, weighted average remaining contractual terms, outstanding 3 years 1 month 6 days    
SSARs, weighted average remaining contractual term, exercisable 3 years 1 month 6 days    
Unrecognized compensation expense $ 0    
Minimum | Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Risk-free interest rate   1.73% 1.04%
Volatility   33.20% 37.00%
Fair value at date of grant $ 4.83 $ 5.02 $ 3.76
Maximum | Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Risk-free interest rate   1.93% 1.25%
Volatility   38.80% 39.60%
Fair value at date of grant $ 6.59 $ 6.73 $ 4.83