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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net Income (Loss) Attributable to Parent	$ 82,150	$ 22,976	$ 48,578	$ 35,489	$ 12,220	$ 342,571	$ 30,022	$ 33,190	$ 189,193	$ 418,003	$ 47,234
Other comprehensive income (loss), net of tax:
Fair value of adjustments to available-for-sale securities									433	(299)	(263)
Comprehensive income									189,626	417,704	46,971
Accumulated Other Comprehensive Loss, Net
Net Income (Loss) Attributable to Parent									0
Other comprehensive income (loss), net of tax:
Fair value of adjustments to available-for-sale securities									$ 433	$ (299)	$ (263)

X

- Definition

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

+ References

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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 and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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