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Stock-Based Compensation (Details 2) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Stock-based compensation expense        
Recognized stock-based compensation expense $ 3,100,000 $ 3,400,000 $ 6,100,000 $ 7,100,000
Stock options
       
Stock-based compensation expense        
Recognized stock-based compensation expense 1,800,000 2,400,000 3,700,000 5,200,000
Unrecognized stock-based compensation 12,300,000   12,300,000  
Weighted average period over which compensation will be recognized     1 year 4 months 24 days  
Total intrinsic value of options exercised 4,000,000 5,000,000 13,900,000 20,900,000
Restricted Stock Units
       
Stock-based compensation expense        
Recognized stock-based compensation expense 1,200,000 800,000 2,100,000 1,500,000
Unrecognized stock-based compensation 11,200,000   11,200,000  
Weighted average period over which compensation will be recognized     1 year 10 months 24 days  
Restricted stock units and restricted stock awards        
Non-vested stock at the beginning of the period (in shares)     446,000  
Granted (in shares) 21,861   219,000  
Vesting of restricted stock units, net of shares withheld for taxes (in shares)     (37,000)  
Shares withheld for payment of taxes upon vesting of restricted stock awards     (20,000)  
Forfeitures (in shares)     (38,000)  
Non-vested stock at the end of the period (in shares) 570,000   570,000  
Restricted stock units and restricted stock awards, Weighted Average Grant Date Fair Value        
Non-vested stock at the beginning of the period (in dollars per share)     $ 25.44  
Granted (in dollars per share)     $ 28.55  
Vesting of restricted stock units, net of shares withheld for taxes (in dollars per share)     $ 24.90  
Shares withheld for payment of taxes upon vesting of restricted stock awards (in dollars per share)     $ 24.90  
Forfeitures (in dollars per share)     $ 25.42  
Non-vested stock at the end of the period (in dollars per share) $ 26.60   $ 26.60  
Aggregate Intrinsic Value        
Non-vested stock at the end of the period     13,270,000  
Fair value of shares vested 600,000   6,200,000  
Restricted Stock Awards
       
Stock-based compensation expense        
Recognized stock-based compensation expense 200,000 200,000 300,000 400,000
Unrecognized stock-based compensation 400,000   400,000  
Weighted average period over which compensation will be recognized     7 months 6 days  
Restricted stock units and restricted stock awards        
Non-vested stock at the beginning of the period (in shares)     192,000  
Vesting of restricted stock units, net of shares withheld for taxes (in shares)     (61,000)  
Shares withheld for payment of taxes upon vesting of restricted stock awards     (35,000)  
Forfeitures (in shares)     (14,000)  
Non-vested stock at the end of the period (in shares) 82,000   82,000  
Restricted stock units and restricted stock awards, Weighted Average Grant Date Fair Value        
Non-vested stock at the beginning of the period (in dollars per share)     $ 10.42  
Vesting of restricted stock units, net of shares withheld for taxes (in dollars per share)     $ 10.42  
Shares withheld for payment of taxes upon vesting of restricted stock awards (in dollars per share)     $ 10.42  
Forfeitures (in dollars per share)     $ 10.42  
Non-vested stock at the end of the period (in dollars per share) $ 10.42   $ 10.42  
Aggregate Intrinsic Value        
Non-vested stock at the end of the period     1,900,000  
Fair value of shares vested     $ 1,000,000