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Retirement Plans, Amounts Recognized in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) $ 77,940 $ 104,795
Prior service cost (credit) 0 0
Accumulated other compensation income 77,940 104,795
SERP [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 508 566
Prior service cost (credit) 0 0
Accumulated other compensation income 508 566
Other Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) (6,319) (6,787)
Prior service cost (credit) 0 0
Accumulated other compensation income $ (6,319) $ (6,787)