SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation allowance, at beginning of year	$ 220,585	$ 226,754	$ 329,526
Charged to costs and expenses	75	115	1,938
Deductions	(7,941)	(6,284)	(104,710)
Valuation allowance, at end of year	212,719	220,585	226,754
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation allowance, at beginning of year	218,377	221,707	326,417
Charged to costs and expenses	0	0	0
Deductions	(6,754)	(3,330)	(104,710)
Valuation allowance, at end of year	211,623	218,377	221,707
SEC Schedule, 12-09, Reserve, Inventory [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation allowance, at beginning of year	1,743	4,182	3,109
Charged to costs and expenses	0	15	1,073
Deductions	(1,127)	(2,454)	0
Valuation allowance, at end of year	616	1,743	4,182
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation allowance, at beginning of year	465	865	0
Charged to costs and expenses	75	100	865
Deductions	(60)	(500)	0
Valuation allowance, at end of year	$ 480	$ 465	$ 865