Income Taxes (Details 3)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory federal tax rate	21.00%	35.00%	35.00%
State taxes	2.50%	1.80%	2.30%
Foreign rate differential	(0.20%)	(10.70%)	(11.30%)
Foreign, federal and state income tax credits	(1.50%)	(2.00%)	(1.20%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Percent	(10.80%)	0.10%	14.40%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	(3.40%)	23.80%	0.00%
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent	0.00%	5.10%	0.00%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent	0.00%	5.40%	0.00%
Other	0.40%	3.10%	0.40%
Effective tax rate	8.00%	61.60%	39.60%