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Stock-Based Compensation and Other Plans (Details 6) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Other Compensation Arrangements      
Accrued compensation costs related to the deferred compensation plans $ 0.4 $ 0.4  
Restricted stock and restricted stock units
     
Restricted Stock Awards/Restricted Stock Units:      
Service period 3 years    
Additional information      
Total fair value of awards vested (in dollars) $ 6.6 $ 7.6 $ 21.2
Unvested Restricted Stock Awards
     
Unvested shares      
Balance at the beginning of the period (in shares) 337,587 305,687 570,525
Granted (in shares) 11,955 408,728 129,154
Vested (in shares) (212,047) (140,399) (341,232)
Forfeited (in shares) (122,661) (236,429) (52,760)
Balance at the end of the period (in shares) 14,834 337,587 305,687
Weighted Average Grant-Date Fair Value      
Balance at the beginning of the period (in dollars per share) $ 33.40 $ 73.60 $ 72.00
Granted (in dollars per share) $ 14.03 $ 27.80 $ 38.40
Vested (in dollars per share) $ 33.17 $ 52.40 $ 60.40
Forfeited (in dollars per share) $ 32.09 $ 64.40 $ 55.00
Balance at the end of the period (in dollars per share) $ 32.00 $ 33.40 $ 73.60
Unvested Restricted Stock Awards | Former Chief Operating Officer | Senior Management Compensation and Retention Plan
     
Other Compensation Arrangements      
Unvested shares of restricted stock 20,833    
Unvested Restricted Stock Units
     
Unvested shares      
Balance at the beginning of the period (in shares) 197,962 399,530 309,567
Granted (in shares) 75,531 80,000 327,393
Vested (in shares) (236,945) (145,290) (159,768)
Forfeited (in shares) (33,077) (136,278) (77,662)
Balance at the end of the period (in shares) 3,471 197,962 399,530
Weighted Average Grant-Date Fair Value      
Balance at the beginning of the period (in dollars per share) $ 36.20 $ 49.40 $ 64.40
Granted (in dollars per share) $ 13.80 $ 17.20 $ 39.20
Vested (in dollars per share) $ 28.71 $ 58.00 $ 57.40
Forfeited (in dollars per share) $ 37.91 $ 40.20 $ 50.60
Balance at the end of the period (in dollars per share) $ 42.00 $ 36.20 $ 49.40
Unvested Restricted Stock Units | CEO
     
Unvested shares      
Granted (in shares) 16,667