Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Income Tax [Abstract]
Income tax expense	$ 2,167	$ 2,038
Decrease in income tax expense	200	$ 200
Gross unrecognized tax benefits	$ 600		$ 600