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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Curtailment expense $ 0 $ 0 $ 16
Net actuarial (gain) loss (2,438) 54,136 (59,654)
Reversal of amortization of net actuarial loss (7,077) (1,902) (4,374)
Reversal of amortization of prior service cost     (10)
Retirement Income Plan [Member]      
Defined Benefit Plan, Benefit Obligation 310,308 322,271 249,422
Service cost 7,215 5,763 7,346
Interest cost 13,668 12,776 12,139
Expected return on plan assets (15,969) (15,671) (15,755)
Amortization of unrecognized prior service cost 0 0 21
Amortization of unrecognized actuarial loss 6,831 1,776 4,145
Curtailment expense 0 0 189
Total net periodic cost 11,745 4,644 8,085
Net actuarial (gain) loss (1,425) 52,556 (58,001)
Reversal of amortization of net actuarial loss (6,831) (1,776) (4,145)
Reversal of amortization of prior service cost 0 0 (21)
Defined Benefit Plan Recognized Net Gain Loss Reclassification From Other ComprhensiveIncome Due To Curtailments 0 0 (189)
Total recognized in other comprehensive income (8,256) 50,780 (62,356)
Total recognized in net periodic benefit cost and OCI 3,489 55,424 (54,271)
Estimated net actuarial loss that will be amortized from AOCI into net periodic benefit cost 5,900    
Retirement Life Plan [Member]      
Defined Benefit Plan, Benefit Obligation 6,000 6,400  
Total net periodic cost 300 400 400
Supplemental Employee Retirement Plan [Member]      
Defined Benefit Plan, Benefit Obligation 8,500 8,800  
Total net periodic cost $ 800 $ 600 $ 500