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Income Taxes (Details 2)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Differences between the U.S. federal statutory rate and the Company's effective tax rate for continuing operations      
U.S. federal statutory rate (as a percent) 35.00% 35.00% 35.00%
State income taxes, net of U.S. federal income tax expense (as a percent) 3.50% 3.80% 4.50%
Provision to return adjustments, net (as a percent) (0.30%) (0.20%) (0.30%)
Deferred tax adjustments, net (as a percent)     (0.10%)
Domestic production/manufacturing deduction (as a percent) (2.00%) (2.00%) (2.70%)
Non-deductible meals and entertainment (as a percent) 0.40% 0.40% 0.70%
Research and development credit (as a percent)   (0.10%) (0.10%)
Other, net (as a percent) 0.10% 0.50%  
Total (as a percent) 36.70% 37.40% 37.00%