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Equity Compensation Plans and Equity (Details 4) (USD $)
 0 Months Ended 12 Months Ended
Aug. 24, 2010
Dec. 31, 2011
Dec. 31, 2012
Treasury Stock
Dec. 31, 2011
Treasury Stock
Dec. 31, 2010
Treasury Stock
Dec. 31, 2012
Retained Earnings
Dec. 31, 2012
Common Stock
Dec. 31, 2011
Common Stock
Treasury Stock Activity                
Authorized amount of common stock repurchase (in dollars) $ 200,000,000              
Treasury stock (in shares)       4,160,228 1,118,600     4,160,228
Amount of shares repurchased including transaction costs (in dollars)   162,077,000   162,000,000 38,000,000      
Average cost of per share repurchased (in dollars per share)       $ 38.96 $ 34.06      
Treasury shares cancelled and retired     5,278,828          
Reduction due to retirement of treasury stock     200,200,000          
Reduction in treasury stock due to retirement           $ 200,100,000 $ 100,000