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Income Taxes (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Income Tax Disclosure [Abstract]          
Income tax provision $ 23,998,000 $ 24,024,000 $ 75,428,000 $ 60,622,000  
Effective income tax rates 37.60% 39.50% 37.60% 37.50%  
Actual income tax rates 34.50% 44.70% 36.60% 38.80%  
Unrecognized income tax benefits 4,300,000   4,300,000   3,100,000
Unrecognized income tax benefits, if recognized, that would favorably affect the effective income tax rate 2,200,000   2,200,000   1,700,000
Accrued interest expense related to unrecognized income tax benefits 300,000   300,000   300,000
Interest expense related to unrecognized income tax benefits 100,000 200,000   600,000  
Interest income related to unrecognized income tax benefits     100,000    
Unrecognized income tax benefits to be recognized in the next twelve months $ 100,000   $ 100,000