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Accumulated Other Comprehensive Income, Reclassified (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Amortization of postretirement benefit plans [Abstract]        
Prior service benefit $ 0 $ (14) $ 0 $ (41)
Unrecognized (gain) loss (165) 194 (496) 584
Income tax expense 66 $ (75) 10 $ (347)
Total reclassifications for the period (99)   (297)  
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Amortization of postretirement benefit plans [Abstract]        
Prior service benefit [1] 0   0  
Unrecognized (gain) loss [1] (165)   (496)  
Total before income tax (165)   (496)  
Income tax expense 66   199  
Total reclassifications for the period $ (99)   $ (297)  
[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).