Schedule II-Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for doubtful trade receivables
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 2,214	$ 5,666	$ 4,519
Charges to costs and expenses	1,876	617	3,794
Recoveries and write offs	(1,935)	(4,069)	(2,647)
Balance at end of period	2,155	2,214	5,666
Allowance for slow moving and excess inventory
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	71,020	108,567	83,566
Charges to costs and expenses	15,595	1,032	34,155
Recoveries and write offs	(4,466)	(38,579)	(9,154)
Balance at end of period	$ 82,149	$ 71,020	$ 108,567