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Shareholders' Equity and Stock-Based Compensation (Details 2) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
May. 14, 2015
May. 13, 2015
Par value (in dollars per share)       $ 0.01 $ 10.00
Summary of common shares issued, treasury shares and shares outstanding          
Balance at the beginning of the period (in shares) 40,858,006 45,281,000 48,304,000    
Stock options exercised (in shares)     8,000    
Share repurchases (in shares)   (4,852,000) (3,493,000)    
Restricted stock shares and restricted stock units (in shares) 198,000 262,000 256,000    
Other (in shares) 360,000 167,000 206,000    
Balance at the end of the period (in shares) 41,415,909 40,858,006 45,281,000    
Common Stock          
Authorized shares 200,000,000.0        
Par value (in dollars per share) $ 0.01        
Summary of common shares issued, treasury shares and shares outstanding          
Balance at the beginning of the period (in shares) 100,064,000 99,801,000 99,454,000    
Stock options exercised (in shares)     8,000    
Share repurchases (in shares)   0 0    
Restricted stock shares and restricted stock units (in shares) 102,000 96,000 133,000    
Other (in shares) 360,000 167,000 206,000    
Balance at the end of the period (in shares) 100,526,000 100,064,000 99,801,000    
Common Stock In Treasury          
Summary of common shares issued, treasury shares and shares outstanding          
Balance at the beginning of the period (in shares) (59,206,000) (54,520,000) (51,150,000)    
Stock options exercised (in shares)     0    
Share repurchases (in shares)   (4,852,000) (3,493,000)    
Restricted stock shares and restricted stock units (in shares) 96,000 166,000 123,000    
Other (in shares) 0 0 0    
Balance at the end of the period (in shares) (59,110,000) (59,206,000) (54,520,000)