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Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Condensed Consolidated Statements of Comprehensive (Loss) Income [Abstract]    
Net (loss) income $ (6,404) $ 638
Other comprehensive income:    
Pension liability adjustments, net of tax 88 77
Postretirement liability adjustments, net of tax (52) (49)
Other comprehensive income 36 28
Comprehensive (loss) income $ (6,368) $ 666