Quarterly report pursuant to Section 13 or 15(d)

Other Operating Expense, Net (Details)

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Other Operating Expense, Net (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Other Income and Expenses [Abstract]    
Amortization expense $ 8,664 $ 8,949
Net loss on asset disposals 820 1,152
Insurance recoveries 0 (1,244)
Environmental related costs 479 89
Other, net 776 368
Other operating expense, net 10,739 9,314
Total gain related to insurance recoveries   $ 1,500
Insurance recoveries recorded as gain on asset disposals 207  
Insurance recoveries recorded as non-operating income $ 49