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Retirement Plans, Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Recognition of actuarial loss (gain) [1] $ 15,013 $ (19,482) $ 71,843
Recognition of prior service credit (cost) [1] (4,763) (6,963) (68)
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 13,402 14,683 10,645
Interest cost 14,123 13,302 12,839
Expected return on plan assets (16,805) (17,921) (18,858)
Actuarial loss (gain) 5,484 7,728 701
Prior service (credit) cost 0 0 0
Net periodic benefit cost 16,204 17,792 5,327
Current year actuarial loss (gain) 15,203 (19,127) 72,737
Recognition of actuarial loss (gain) (5,484) (7,728) (701)
Recognition of prior service credit (cost) 0 0 0
Total recognized in other comprehensive income 9,719 (26,855) 72,036
Total recognized in net periodic benefit cost and other comprehensive income 25,923 (9,063) 77,363
SERP [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 0 0
Interest cost 65 64 73
Expected return on plan assets 0 0 0
Actuarial loss (gain) 26 28 16
Prior service (credit) cost 0 0 0
Net periodic benefit cost 91 92 89
Current year actuarial loss (gain) 12 (30) 180
Recognition of actuarial loss (gain) (26) (28) (16)
Recognition of prior service credit (cost) 0 0 0
Total recognized in other comprehensive income (14) (58) 164
Total recognized in net periodic benefit cost and other comprehensive income 77 34 253
Other Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 0 0
Interest cost 29 36 110
Actuarial loss (gain) (747) (793) (649)
Prior service (credit) cost 0 0 0
Net periodic benefit cost (718) (757) (539)
Current year actuarial loss (gain) (198) (322) (1,065)
Recognition of actuarial loss (gain) 747 793 649
Recognition of prior service credit (cost) 0 0 0
Adjustment for actual Medicare Part D reimbursement (3) (3) (8)
Total recognized in other comprehensive income 546 468 (424)
Total recognized in net periodic benefit cost and other comprehensive income $ (172) $ (289) $ (963)
[1] Actuarial gains (losses) are amortized into costs of sales and operating expenses or selling, general and administrative expenses as appropriate. (See Note 9 - Retirement Plans)