Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Reduction to tax expense	$ 1,522
Effective tax rate		21.50%	20.50%	69.60%
Effective tax rate scenario without TCJA				20.20%
TCJA one-time expense				$ 99,214
TCJA, benefit on current year repatriation				2,514
TCJA liability recorded for earnings expected to repatriate	$ 5,052	$ 5,052		$ 6,932
Foreign earnings repatriated		$ 51,653