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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 106	$ 117	$ 318	$ 351
Interest cost	1,322	1,225	3,966	3,675
Expected return on assets	(1,531)	(1,971)	(4,593)	(5,913)
Amortization of prior service cost	12	0	38	0
Amortization of actuarial loss	11	0	31	0
Net periodic pension and postretirement benefit credit	(80)	(629)	(240)	(1,887)
Contributions paid	$ 0	$ 0	$ 0	$ 0