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Employee Benefit Plans (Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 10,637 $ 9,522 $ 8,255
Interest cost 8,253 10,112 11,712
Expected return on assets (24,454) (20,781) (17,968)
Amortization of net (income) loss 8,489 8,551 7,635
Settlements 464 1,025 408
Net periodic benefit cost 3,388 8,429 10,042
Other comprehensive income (loss) attributable to change from prior year (24,251) (5,486)  
Total recognized in net periodic benefit cost and other comprehensive income (loss) (20,863) 2,943  
Post-Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1,096 1,066 983
Interest cost 641 845 980
Amortization of prior service cost (577) (577) (577)
Expected return on assets 155
Net periodic benefit cost 1,161 1,334 $ 1,231
Other comprehensive income (loss) attributable to change from prior year (5,468) 4,619  
Total recognized in net periodic benefit cost and other comprehensive income (loss) $ (4,307) $ 5,953