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Retirement Plans (Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred Compensation Plan Contributions By Employer $ 400 $ 200 $ 300
Net actuarial loss (gain) 11,273 4,684 12,079
Reversal of amortization of net actuarial loss (2,127) (2,102) (6,462)
Retirement Income Plan [Member]      
Service cost 0 0 1,647
Interest cost 12,428 12,490 12,336
Expected return on plan assets (22,767) (19,419) (17,309)
Amortization of unrecognized actuarial loss 1,981 2,001 6,299
Total net periodic cost (8,358) (4,928) 2,973
Net actuarial loss (gain) 12,600 3,594 11,316
Reversal of amortization of net actuarial loss (1,981) (2,001) (6,299)
Total recognized in other comprehensive income 10,619 1,593 5,017
Total recognized in net periodic benefit cost and OCI 2,261 (3,335) 7,990
Estimated net actuarial loss that will be amortized from AOCI into net periodic benefit cost 2,600    
Retirement Life Plan [Member]      
Total net periodic cost 300 300 300
Supplemental Employee Retirement Plan [Member]      
Total net periodic cost $ 400 $ 400 $ 500