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Accumulated Other Comprehensive Income, Reclassified (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Amortization of postretirement benefit plans [Abstract]    
Unrecognized gain $ (9) $ (59)
Income tax expense 4 $ 24
Total reclassifications for the period (5)  
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Amortization of postretirement benefit plans [Abstract]    
Prior service benefit [1] 0  
Unrecognized gain [1] (9)  
Total before income tax (9)  
Income tax expense 4  
Total reclassifications for the period $ (5)  
[1] These accumulated other comprehensive income components are included in the computation of net periodic postretirement benefit costs, which are included in other non-operating income, net in our consolidated statements of operations (see Note 12 for additional details).