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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Other Income and Expenses [Abstract]        
Amortization expense $ 8,636 $ 8,744 $ 17,300 $ 17,693
Net (gain) loss on asset disposals (9,659) 4,752 (8,839) 5,904
Insurance recoveries 0 (313) 0 (1,557)
Environmental related costs 848 398 1,327 487
Other, net 1,994 2,292 2,770 2,660
Other operating expense, net $ 1,819 15,873 $ 12,558 25,187
Total gain related to insurance recoveries   1,000   2,500
Insurance recoveries recorded as gain on asset disposals       207
Insurance recoveries recorded as non-operating income   $ 687   $ 736