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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 2,564	$ (19,743)	$ (8,116)	$ (39,609)
Other comprehensive income (loss):
Net unrealized gain (loss) on investments	356	18	(91)	(34)
Total other comprehensive income (loss)	356	18	(91)	(34)
Comprehensive income (loss)	$ 2,920	$ (19,725)	$ (8,207)	$ (39,643)

X

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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