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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 3,712	$ 3,036	$ 12,087	$ 29,427
Other comprehensive (loss) income, net of taxes:
Unrealized (loss) gain on marketable securities	(14)	16	32	21
Total other comprehensive (loss) income	(14)	16	32	21
Comprehensive income	$ 3,698	$ 3,052	$ 12,119	$ 29,448

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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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