Income Taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of year	$ 1,244	$ 1,180	$ 1,359
Additions based on tax positions related to the current year	367	331	239
Additions for tax positions of prior years	50	41	39
Settlements or lapse of statute of limitations	(360)	(308)	(457)
Balance at end of year	$ 1,301	$ 1,244	$ 1,180