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Stock-Based Compensation (Details 4) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Additional disclosures      
Stock based compensation expense $ 33,500,000 $ 39,500,000 $ 14,400,000
Stock Appreciation Rights
      
Stock-Based Compensation arrangements      
Contractual term 7 years    
Graded vesting rights 3 years    
Vesting rights one-third of the award becoming exercisable each year on the anniversary date of the grant    
Weighted-average value per stock appreciation rights granted during the period (in dollars per share) $ 16.31 $ 9.47 $ 9.48
Assumptions:      
Stock price volatility (as a percent) 55.30% 52.70% 52.90%
Risk free rate of return (as a percent) 0.90% 2.30% 2.40%
Expected dividend yield (as a percent) 0.30% 0.30% 0.30%
Expected term 5 years 5 years 5 years
Shares      
Outstanding at the beginning of the period (in shares) 1,288,130 1,471,300 1,346,200
Granted (in shares) 120,442 191,500 159,100
Exercised (in shares) (547,350) (374,670) (34,000)
Outstanding at the end of the period (in shares) 861,222 1,288,130 1,471,300
Exercisable at the end of the period (in shares) 572,986 902,664 1,064,444
Weighted-Average Exercise Price (in dollars per share)      
Outstanding at the beginning of the period (in dollars per share) $ 16.04 $ 15.27 $ 14.64
Granted (in dollars per share) $ 35.18 $ 20.37 $ 20.27
Exercised (in dollars per share) $ 14.84 $ 15.22 $ 13.58
Outstanding at the end of the period (in dollars per share) $ 19.49 $ 16.04 $ 15.27
Excercisable (in dollars per share) $ 15.94 $ 15.14 $ 14.82
Additional disclosures      
Aggregate intrinsic value of stock appreciation rights outstanding 26,100,000    
Stock appreciation rights outstanding, weighted average remaining contractual term 3 years 10 months 24 days    
Aggregate intrinsic value of stock appreciation rights exercisable 19,400,000    
Stock appreciation rights exercisable, weighted average remaining contractual term 3 years 1 month 6 days    
Stock based compensation expense 1,900,000 2,100,000 1,600,000
Compensation expenses related to the immediate expensing of shares granted to retirement-eligible employees 1,200,000 100,000 0
Unamortized compensation expense $ 400,000    
Unrecognized compensation expense recognition period 2 years