Quarterly report pursuant to Section 13 or 15(d)

Income Taxes Income Taxes (Details)

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Income Taxes Income Taxes (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Tax Disclosure [Abstract]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00% 35.00% 35.00% 35.00%
Effective tax rate 36.90% 34.90% 37.30% 37.80%
Discrete Tax Adjustments $ 1,600,000 $ 2,700,000 $ 3,200,000 $ 2,700,000