Summary of Significant Accounting Policies - Schedule of Net Benefit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Postemployment Benefits [Abstract]
Amortization of actuarial losses	$ 277	$ 322	$ 285
Income tax		(57)	(63)
Net of tax	$ 277	$ 265	$ 222