Employee Benefit Plans - Schedule of Net Benefit Costs (Details) - Pension and Other Postretirement Plans, Defined Benefit - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 111	$ 106	$ 335	$ 318
Interest cost	1,015	1,322	3,044	3,966
Expected return on assets	(1,680)	(1,531)	(5,042)	(4,593)
Amortization of prior service cost	13	12	39	38
Amortization of actuarial loss	12	11	36	31
Net periodic pension and postretirement benefit credit	(529)	(80)	(1,588)	(240)
Contributions paid	$ 0	$ 0	$ 0	$ 0