Schedule II-Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful trade receivables
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 5,666	$ 4,519	$ 5,570
Charges to costs and expenses	617	3,794	1,709
Recoveries and write offs	(4,069)	(2,647)	(2,760)
Balance at end of period	2,214	5,666	4,519
Allowance for slow moving and excess inventory
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	108,567	83,566	45,648
Charges to costs and expenses	1,032	34,155	32,204
Recoveries and write offs	(38,579)	(9,154)	5,714
Balance at end of period	$ 71,020	$ 108,567	$ 83,566