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Income Taxes - Schedule of effective tax rate reconciliation (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
U.S federal statutory rate	21.00%	35.00%	35.00%
Deferred balance adjustments due to Tax Act, net	0.00%	(31.60%)	0.00%
State income taxes, net of U.S. federal income tax expense	5.20%	5.30%	5.20%
Change in valuation allowance	1.20%	6.40%	1.60%
Domestic production/manufacturing deduction	0.00%	(1.60%)	(1.90%)
Tax differential on foreign earnings	(0.50%)	3.20%	0.60%
Deferred state tax adjustments, net	0.00%	(2.40%)	1.60%
Non-deductible meals and entertainment	0.80%	1.70%	1.00%
Stock compensation excess tax benefits	(0.10%)	(3.10%)	0.00%
Uncertain tax positions	0.10%	2.00%	0.00%
Provision to return adjustments, net	(0.20%)	(0.30%)	0.80%
Non-controlling interest	(0.50%)	0.00%	0.00%
Other income, net	0.30%	(0.50%)	0.20%
Effective rate	27.30%	14.10%	44.10%

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The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate attributable to provision to return adjustments.

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