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Income Taxes (Details 2) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Differences between the U.S. federal statutory rate and the Company's effective tax rate for continuing operations |  |  |
U.S federal statutory rate | 35.00% | 35.00% | 35.00%
Deferred balance adjustments due to Tax Act, net | (31.60%) | 0.00% | 0.00%
State income taxes, net of U.S. federal income tax expense | 5.30% | 5.20% | 4.60%
Change in valuation allowance | 6.40% | 1.60% | 0.00%
Domestic production/manufacturing deduction | (1.60%) | (1.90%) | (2.40%)
Tax differential on foreign earnings | 3.20% | 0.60% | 0.30%
Deferred state tax adjustments, net | (2.40%) | 1.60% | 0.00%
Non-deductible meals and entertainment | 1.70% | 1.00% | 0.60%
Stock compensation excess tax benefits | (3.10%) | 0.00% | 0.00%
Uncertain tax positions | 2.00% | 0.00% | (0.40%)
Provision to return adjustments, net | (0.30%) | 0.80% | 0.50%
Other income, net | (0.50%) | 0.20% | 0.20%
Effective rate | 14.10% | 44.10% | 38.40%

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