INCOME TAXES Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Asset (Liability) [Line Items]
Deferred Tax Assets, Capital Loss Carryforwards	$ 1,600
Tax credit and net operating loss carryforwards	254,745	$ 267,049
Allowances for bad debts	47	69
Revenues	6,659	2,651
Costs and expenses	23,217	19,400
Inventories	1,466	2,282
Acquired intangible assets	62	187
Deferred Tax Assets, Other	7,432	7,605
Gross deferred tax assets	293,628	299,243
Valuation allowance	(278,785)	(281,568)
Deferred tax assets after valuation allowance	14,843	17,675
Deferred Tax Liabilities, Revenues	0	(1,052)
Costs and expenses	(626)	(1,527)
Acquired intangible assets	(92)	0
Basis differerence convertible notes	0	(326)
Deferred Tax Liabilities, Leasing Arrangements	(7,324)	(7,291)
Gross deferred tax liabilities	(8,042)	(10,196)
Net deferred tax assets (liabilities)	6,801	7,479
Long-term deferred tax liabilities, net	0	$ 0
US Federal and State [Member]
Deferred Tax Asset (Liability) [Line Items]
Tax credit carryforwards	48,600
Net operating loss carryforwards	719,900
Foreign [Member]
Deferred Tax Asset (Liability) [Line Items]
Tax credit carryforwards	6,200
Net operating loss carryforwards	107,000
Valuation allowance, tax credits	6,200
Valuation allowance, net operating losses	$ 63,800