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Retirement Plans, Amounts Recognized in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) $ 87,658 $ 77,940
Prior service cost (credit) 0 0
Accumulated other compensation income 87,658 77,940
SERP [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 494 508
Prior service cost (credit) 0 0
Accumulated other compensation income 494 508
Other Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) (5,773) (6,319)
Prior service cost (credit) 0 0
Accumulated other compensation income $ (5,773) $ (6,319)