Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	$ 142,000		$ 142,000		$ 142,000
Defined Benefit Plan, Service Cost	856	$ 1,074	1,526	$ 1,661
Defined Benefit Plan, Interest Cost	731	1,010	1,449	1,995
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(662)	(560)	(1,140)	(1,340)
Defined Benefit Plan, Amortization of Gain (Loss)	555	37	669	290
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	3,580	1,561	4,604	2,606
Defined Benefits Plan, Settlements Loss	2,100	$ 0	$ 2,100	$ 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	$ 2,000