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Amounts Recognized (Pre-tax) in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Pension Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Future Amortization of Gain (Loss) $ (10,300)  
Net loss 99,865 $ 117,640
Prior service cost (credit) 0 8
Net amount recognized 99,865 117,648
Other Postretirement Employee Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Future Amortization of Gain (Loss) (900)  
Net loss (15,541) (20,906)
Prior service cost (credit) (1,676) (3,211)
Net amount recognized $ (17,217) $ (24,117)