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Income Taxes Reconciliation of effective tax rate (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory Federal rate	21.00%	35.00%
Change in deferred tax asset valuation allowance reversal	0.00%	(210.50%)
Change in deferred tax asset valuation allowance - federal tax rate change	0.00%	(126.40%)
Increase (decrease) resulting from:
State and local taxes, net	4.70%	4.70%
Change in valuation allowance	3.70%	(65.70%)
Change in federal tax rate	0.00%	126.40%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent	(13.90%)	29.20%
Meals & entertainment	2.40%	1.40%
Alternative minimum tax	1.40%	3.60%
Provision to return differences	(9.30%)	(0.70%)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	2.50%	0.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent	(4.50%)	(1.90%)
Change in uncertain tax positions	(1.40%)	7.70%
Other items, net	2.90%	3.10%
Provision for income taxes	9.50%	(194.10%)

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