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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statements of Comprehensive Income [Abstract]
Net income (loss)	$ (15,671)	$ 20,612	$ 34,802
Other comprehensive income:
Unrealized gain on marketable securities, net of tax	32
Comprehensive income (loss)	$ (15,639)	$ 20,612	$ 34,802

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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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

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