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Condensed Consolidated Statements of Operations - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement [Abstract]            
Revenues $ 451,993,000   $ 432,099,000   $ 880,772,000 $ 869,051,000
Costs and expenses:            
Cost of sales (409,825,000)   (387,154,000)   (794,071,000) (779,587,000)
Selling, general and administrative expenses (26,827,000)   (26,564,000)   (56,998,000) (59,544,000)
Total operating costs and expenses (436,652,000)   (413,718,000)   (851,069,000) (839,131,000)
Income (loss) from operations 15,341,000   18,381,000   29,703,000 29,920,000
Interest expense, net (10,914,000)   (7,723,000)   (19,400,000) (15,743,000)
Non-operating pension and other postretirment benefit (costs) income (1,531,000)   (1,187,000)   (2,845,000) (2,466,000)
Earnings (loss) before income taxes 2,896,000   9,471,000   7,458,000 11,711,000
Income tax provision (3,320,000)   (2,510,000)   (4,045,000) (2,150,000)
Net earnings (loss) $ (424,000) $ 3,837,000 $ 6,961,000 $ 2,600,000 $ 3,413,000 $ 9,561,000
Net earnings per common share:            
Basic (in dollars per share) $ (0.03)   $ 0.42   $ 0.21 $ 0.58
Diluted (in dollars per share) $ (0.03)   $ 0.42   $ 0.21 $ 0.58