Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	$ 141,000			$ 141,000		$ 142,000
Defined Benefit Plan, Service Cost	688		$ 551	2,214	$ 2,212
Defined Benefit Plan, Interest Cost	682		959	2,131	2,954
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(411)		(455)	(1,551)	(1,795)
Defined Benefit Plan, Amortization of Gain (Loss)	(238)		61	(907)	(229)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	4,753		994	9,357	3,600
Defined Benefits Plan, Settlements Loss	3,556		$ 0	$ 5,656	$ 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax	$ 4,000	$ 2,000