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Equity Incentive Program - Stock Options and SSARs (Details) - USD ($)
$ / shares in Units, number in Thousands, $ in Millions
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
SSARs    
SSARs, Number of Shares    
Beginning balance 1,064,383  
Granted 0  
Assumed from Audience acquisition 0  
Exercised (18,947)  
Forfeited (13,380)  
Expired (10,925)  
Ending balance 1,021,131  
Exercisable 695,248  
SSARs, Weighted-average grant date fair value    
Beginning balance $ 20.81  
Granted 0.00  
Assumed from Audience acquisition 0.00  
Exercised 11.79  
Forfeited 23.92  
Expired 21.97  
Ending balance 20.93  
Exercisable $ 19.52  
SARS and Options, Additional Disclosures    
SSARs, aggregate intrinsic value, outstanding $ 0.9  
SSARs, aggregate intrinsic value, exercisable $ 0.9  
SSARs, weighted average remaining contractual terms, outstanding 6 years  
SSARs, weighted average remaining contractual term, exercisable 5 years 5 months  
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Dividend yield 0.00% 0.00%
Expected life (years) 4 years 6 months  
Stock Options, Number of Shares    
Beginning balance 1,327,990  
Granted 1,955,707  
Assumed from Audience acquisition 29,117  
Exercised (2,100)  
Forfeited (128,282)  
Expired (2,966)  
Ending balance 3,179,466  
Exercisable 221,060  
Stock Options, Weighted Average Exercise Price    
Beginning balance $ 29.31  
Granted 18.01  
Assumed from Audience acquisition 17.50  
Exercised 12.65  
Forfeited 20.91  
Expired 27.82  
Ending balance 22.61  
Exercisable $ 29.29  
SARS and Options, Additional Disclosures    
Options, aggregate intrinsic value, outstanding $ 0.9  
Options, aggregate intrinsic value, exercisable $ 0.0  
Options, weighted average remaining contractual term, outstanding 6 years 4 months  
Options, weighted average remaining contractual term, exercisable 5 years 6 months  
Minimum | 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%
Expected life (years)   4 years 6 months
Volatility 0.00% 0.00%
Fair value at date of grant $ 6.59 $ 10.73
Maximum | 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%
Expected life (years)   5 years 3 months
Volatility 0.00% 0.00%
Fair value at date of grant $ 6.88 $ 13.50