Income Taxes Reconciliation of effective tax rate (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory Federal rate	21.00%	21.00%
Increase (decrease) resulting from:
State and local taxes, net	4.50%	4.70%
Change in valuation allowance	(4.50%)	3.70%
Change in deferred tax asset valuation allowance reversal	(13.60%)	0.00%
Effective Income Tax Rate Reconciliation, Capital Loss, Percent	13.60%	0.00%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent	3.10%	(13.30%)
Meals & entertainment	1.80%	2.40%
Alternative minimum tax	0.00%	1.40%
Provision to return differences	0.20%	(9.30%)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	0.00%	2.50%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent	(11.50%)	(4.50%)
Effective Income Tax Rate Reconciliation, Compensation Deduction Limitation, Percent	10.10%	0.00%
Change in uncertain tax positions	(1.00%)	(1.40%)
Other items, net	1.70%	2.30%
Provision for income taxes	25.40%	9.50%