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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - 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:	$ 73,160	$ 6,058	$ 118,441	$ 11,137
Unrealized net gain (loss) on available-for-sale securities, net of tax	135	90	(14)	24
Less: Reclassification of net realized gain (loss) included in net income, net of tax	0	(136)	0	292
Comprehensive income	$ 73,295	$ 6,012	$ 118,427	$ 11,453

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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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