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Accumulated Other Comprehensive Income, Reclassified (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Amortization of postretirement benefit plans [Abstract]    
Prior service benefit $ 0 $ (13)
Unrecognized gain (59) 275
Income tax expense 24 $ (108)
Total reclassifications for the period (35)  
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Amortization of postretirement benefit plans [Abstract]    
Prior service benefit [1] 0  
Unrecognized gain [1] (59)  
Total before income tax (59)  
Income tax expense 24  
Total reclassifications for the period $ (35)  
[1] These accumulated other comprehensive income components are included in the computation of net periodic postretirement benefit costs, which are included in selling, general and administrative expenses in our consolidated statements of operations (see Note 11 for additional details).