Income Taxes (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective tax rate	23.90%	26.90%	69.60%
Effective tax rate scenario without TCJA			20.20%
TCJA one-time expense			$ 99,214,000
TCJA, benefit on current year repatriation	$ 2,514,000
TCJA liability recorded for earnings expected to repatriate	$ 6,932