Employee Benefit Plans - Schedule of Net Benefit Costs (Details) - Pension and Other Postretirement Plans, Defined Benefit - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 112	$ 106	$ 224	$ 212
Interest cost	1,015	1,322	2,029	2,644
Expected return on assets	(1,681)	(1,531)	(3,362)	(3,062)
Amortization of prior service cost	13	13	26	26
Amortization of actuarial loss	12	10	24	20
Net periodic pension and postretirement benefit credit	(529)	(80)	(1,059)	(160)
Contributions paid	$ 0	$ 0	$ 0	$ 0