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Accumulated Other Comprehensive Income, Reclassified (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Amortization of postretirement benefit plans [Abstract]        
Prior service benefit $ (14) $ (27) $ (41) $ (85)
Unrecognized loss 194 676 584 1,806
Income tax expense (75) $ (264) (347) $ (872)
Total reclassifications for the period 105   316  
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Amortization of postretirement benefit plans [Abstract]        
Prior service benefit [1] (14)   (41)  
Unrecognized loss [1] 194   584  
Total before income tax 180   543  
Income tax expense (75)   (227)  
Total reclassifications for the period $ 105   $ 316  
[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).