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Credit Arrangements (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Credit arrangements
Total debt	$ 369,158	$ 258,917
Unamortized debt issuance costs	(1,001)	(102)
Total debt, net	368,157	258,815
Less: current portion	(62,488)	(65,464)
Long-term debt, net of current portion	305,669	193,351
Scheduled maturities of long-term debt
2019	62,488
2020	51,995
2021	37,312
2022	31,052
2023	165,067
Thereafter	21,244
Term Loan
Credit arrangements
Total debt, net	214,500
Commercial equipment notes
Credit arrangements
Total debt, net	127,458	165,532
Mortgages
Credit arrangements
Total debt, net	$ 27,200	11,242
Senior secured notes
Credit arrangements
Total debt, net		$ 82,143

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