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Retirement Plans, Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Recognition of actuarial loss (gain) [1] $ (19,482) $ 71,843 $ (62,503)
Recognition of prior service credit (cost) [1] (6,963) (68) (7,675)
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 14,683 10,645 12,824
Interest cost 13,302 12,839 11,400
Expected return on plan assets (17,921) (18,858) (16,127)
Actuarial loss (gain) 7,728 701 8,276
Prior service (credit) cost 0 0 0
Net periodic benefit cost 17,792 5,327 16,373
Current year actuarial loss (gain) (19,127) 72,737 (61,759)
Recognition of actuarial loss (gain) (7,728) (701) (8,276)
Recognition of prior service credit (cost) 0 0 0
Total recognized in other comprehensive income (26,855) 72,036 (70,035)
Total recognized in net periodic benefit cost and other comprehensive income (9,063) 77,363 (53,662)
SERP [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 0 0
Interest cost 64 73 70
Expected return on plan assets 0 0 0
Actuarial loss (gain) 28 16 19
Prior service (credit) cost 0 0 0
Net periodic benefit cost 92 89 89
Current year actuarial loss (gain) (30) 180 (138)
Recognition of actuarial loss (gain) (28) (16) (19)
Recognition of prior service credit (cost) 0 0 0
Total recognized in other comprehensive income (58) 164 (157)
Total recognized in net periodic benefit cost and other comprehensive income 34 253 (68)
Other Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 0 0
Interest cost 36 110 112
Actuarial loss (gain) (793) (649) (620)
Prior service (credit) cost 0 0 0
Net periodic benefit cost (757) (539) (508)
Current year actuarial loss (gain) (322) (1,065) (600)
Recognition of actuarial loss (gain) 793 649 620
Recognition of prior service credit (cost) 0 0 0
Adjustment for actual Medicare Part D reimbursement (3) (8) (5)
Total recognized in other comprehensive income 468 (424) 15
Total recognized in net periodic benefit cost and other comprehensive income $ (289) $ (963) $ (493)
[1] Actuarial gains (losses) are amortized into costs of sales and operating expenses or selling, general and administrative expenses as appropriate. (See Note 8 - Retirement Plans)