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Retirement Plans, Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Noncurrent asset $ 0 $ 0
Current liability 0 0
Long-term liability (53,737) (72,800)
SERP [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Noncurrent asset 0 0
Current liability (149) (141)
Long-term liability (1,377) (1,496)
Other Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Noncurrent asset 0 0
Current liability (68) (83)
Long-term liability $ (823) $ (1,181)