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Equity Compensation Plans and Equity (Details 3) (USD $)
 1 Months Ended 12 Months Ended
Aug. 31, 2010
Nov. 30, 2009
Oct. 31, 2009
D
Dec. 31, 2011
Y
Dec. 31, 2010
Dec. 31, 2009
Options Outstanding            
Number Outstanding at the end of the period (in shares)       2,106,000    
Weighted-Average Remaining Contractual Life (in years)       6.0    
Weighted-Average Exercise Price (in dollars per share)       $ 25.58    
Options Exercisable            
Number Exercisable at the end of the period (in shares)       983,000    
Weighted-Average Exercise Price (in dollars per share)       $ 17.92    
Shares Reserved for Future Issuance            
Issuance upon exercise of stock options and grants of restricted stock (in shares)       3,961,178    
Issuance of Common Stock            
Shares of the entity's common stock for sale under the Underwriting Agreement     5,000,000      
Maximum additional shares of the entity's common stock that the Underwriters had an option to purchase, which they exercised in full     750,000      
Period for which the Underwriters had an option to purchase additional shares of the entity's common stock (in days)     30      
Number of shares sold   5,750,000        
Net proceeds from issuance of common stock   $ 130,100,000       $ 130,086,000
Transaction costs   300,000        
Treasury Stock            
Authorized amount of common stock repurchase (in dollars) 200,000,000          
Treasury stock (in shares)       4,160,228 1,118,600  
Amount of shares repurchased including transaction costs (in dollars)       $ 162,077,000 $ 38,098,000  
Average cost of per share repurchased (in dollars per share)       $ 38.96 $ 34.06  
Range of Exercise Prices from $8.82 to $15.08
            
Information about stock options outstanding            
Exercise price, low end of range (in dollars per share)       $ 8.82    
Exercise price, high end of range (in dollars per share)       $ 15.08    
Options Outstanding            
Number Outstanding at the end of the period (in shares)       737,000    
Weighted-Average Remaining Contractual Life (in years)       4.4    
Weighted-Average Exercise Price (in dollars per share)       $ 10.98    
Options Exercisable            
Number Exercisable at the end of the period (in shares)       412,000    
Weighted-Average Exercise Price (in dollars per share)       $ 11.27    
Range of Exercise Prices from $15.29 to $23.55
            
Information about stock options outstanding            
Exercise price, low end of range (in dollars per share)       $ 15.29    
Exercise price, high end of range (in dollars per share)       $ 23.55    
Options Outstanding            
Number Outstanding at the end of the period (in shares)       425,000    
Weighted-Average Remaining Contractual Life (in years)       3.1    
Weighted-Average Exercise Price (in dollars per share)       $ 18.49    
Options Exercisable            
Number Exercisable at the end of the period (in shares)       417,000    
Weighted-Average Exercise Price (in dollars per share)       $ 18.39    
Range of Exercise Prices from $24.40 to $39.79
            
Information about stock options outstanding            
Exercise price, low end of range (in dollars per share)       $ 24.40    
Exercise price, high end of range (in dollars per share)       $ 39.79    
Options Outstanding            
Number Outstanding at the end of the period (in shares)       545,000    
Weighted-Average Remaining Contractual Life (in years)       8.3    
Weighted-Average Exercise Price (in dollars per share)       $ 33.39    
Options Exercisable            
Number Exercisable at the end of the period (in shares)       150,000    
Weighted-Average Exercise Price (in dollars per share)       $ 34.11    
Range of Exercise Prices from $42.19 to $51.70
            
Information about stock options outstanding            
Exercise price, low end of range (in dollars per share)       $ 42.19    
Exercise price, high end of range (in dollars per share)       $ 51.70    
Options Outstanding            
Number Outstanding at the end of the period (in shares)       399,000    
Weighted-Average Remaining Contractual Life (in years)       8.9    
Weighted-Average Exercise Price (in dollars per share)       $ 49.45    
Options Exercisable            
Number Exercisable at the end of the period (in shares)       4,000    
Weighted-Average Exercise Price (in dollars per share)       $ 47.37