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Equity Incentive Program - Stock Options and SSARs (Details) - USD ($)
$ / shares in Units, number in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
SSARs    
SSARs, Number of Shares    
Beginning balance 1,013,780  
Granted 0  
Forfeited 0  
Expired (5,672)  
Ending balance 1,008,108  
Exercisable 1,008,108  
SSARs, Weighted-average grant date fair value    
Beginning balance $ 20.92  
Granted 0.00  
Forfeited 0.00  
Expired 15.32  
Ending balance 20.95  
Exercisable $ 20.95  
SARS and Options, Additional Disclosures    
SSARs, aggregate intrinsic value, outstanding $ 0.1  
SSARs, aggregate intrinsic value, exercisable $ 0.1  
SSARs, weighted average remaining contractual terms, outstanding 5 years 6 months  
SSARs, weighted average remaining contractual term, exercisable 5 years 6 months  
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Risk-free interest rate 0.00% 0.00%
Dividend yield 0.00% 0.00%
Expected life (years) 4 years 6 months 4 years 6 months
Volatility 0.00% 0.00%
Fair value at date of grant $ 3.76 $ 6.59
Stock Options, Number of Shares    
Beginning balance 3,165,556  
Granted 1,875,001  
Forfeited (17,961)  
Expired (2,666)  
Ending balance 5,019,930  
Exercisable 939,993  
Stock Options, Weighted Average Exercise Price    
Beginning balance $ 22.58  
Granted 11.02  
Forfeited 18.49  
Expired 29.53  
Ending balance 18.28  
Exercisable $ 22.93  
SARS and Options, Additional Disclosures    
Options, aggregate intrinsic value, outstanding $ 4.1  
Options, aggregate intrinsic value, exercisable $ 0.0  
Options, weighted average remaining contractual term, outstanding 6 years 2 months  
Options, weighted average remaining contractual term, exercisable 5 years 6 months