Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Defined benefit pension plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 1,604	$ 2,258
Expected return on plan assets	(2,288)	(2,723)
Pension settlement	4	0
Amortization of prior service costs (credits)	(28)	0
Net benefit credit	(708)	(465)
Other postretirement benefits plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	106	120
Interest cost	653	876
Amortization of other actuarial losses (gains)	(530)	0
Net benefit credit	$ 229	$ 996