CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
NET LOSS	$ (23,848)	$ (77,211)	$ (117,042)
Available-for-sale debt securities:
Unrealized holding gain (loss) arising during the period, net    of tax impact of $(1,640), $(413) and $272, respectively.	5,482	1,391	(483)
Less: reclassifications to net loss, net of tax impact of    $0, $0 and $(1,191), respectively.	0	0	2,061
Net change in unrealized holding gain (loss), net of tax	5,482	1,391	(2,544)
Cash flow hedges:
Unrealized holding gain (loss) arising during the period, net of tax impact of $0 for all periods presented.	25,266	25,386	(38,351)
Less: reclassifications to net loss, net of tax impact of $0 for all periods presented.	15,853	(2,047)	(5,113)
Net change in unrealized holding gain (loss), net of tax	9,413	27,433	(33,238)
Other	(2)	(6)	5
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	14,893	28,818	(35,777)
COMPREHENSIVE LOSS	$ (8,955)	$ (48,393)	$ (152,819)