Benefit Plans - Summary of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Service cost	$ 63	$ 77	$ 75
Interest	119	118	126
Expected return on assets	0	0	0
Amortization of prior service costs	(57)	(32)	22
Recognition of actuarial items	0	0	(15)
Curtailment gain	(200)	(47)	(153)
Net periodic benefit cost	$ (75)	$ 116	$ 55