SCHEDULE II -VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	$ 15,908	$ 22,299	$ 17,255
Additions Charged to Costs and Expenses			5,044
Deductions		(6,391)
Balance at End of Year		15,908	22,299
Accounting Standards Update 2016-13
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	31,296
Additions Charged to Costs and Expenses	34,623
Deductions	(18)
Balance at End of Year	65,901	31,296
Allowance for inventory obsolescence
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	15,890	22,141	17,098
Additions Charged to Costs and Expenses	3,786		5,043
Deductions		(6,251)
Balance at End of Year	19,676	15,890	22,141
Allowance for doubtful accounts receivable
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	18	158	157
Additions Charged to Costs and Expenses			1
Deductions	(18)	(140)
Balance at End of Year		18	$ 158
Allowance for doubtful accounts receivable | Accounting Standards Update 2016-13
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	15,388
Additions Charged to Costs and Expenses	30,837
Balance at End of Year	$ 46,225	$ 15,388