SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Change in Tax Valuation Allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves balance, beginning of year	$ 12,120	$ 13,309
Charged to Costs and Expenses	(19)	67
Charged other Accounts	6,461	(1,256)
Deductions	0	0
Valuation allowances and reserves balance, end of year	18,562	12,120
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves balance, beginning of year	2,636	2,185
Charged to Costs and Expenses	208	451
Charged other Accounts	0	0
Deductions	636	0
Valuation allowances and reserves balance, end of year	2,208	2,636
Reserve for Inventory Obsolescence
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves balance, beginning of year	2,667	1,304
Charged to Costs and Expenses	2,297	3,343
Charged other Accounts	0	0
Deductions	2,754	1,980
Valuation allowances and reserves balance, end of year	$ 2,210	$ 2,667