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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 8,558	$ 17,201
Unrealized gain (loss) on available-for-sale securities:
Unrealized gain (loss) arising during the period	(13,561)	1,300
Reclassification adjustment for gain included in net income	(3,704)	(1,960)
Total change in unrealized gain (loss) on available-for-sale securities	(17,265)	(660)
Total other comprehensive loss	(17,265)	(660)
Comprehensive income (loss)	$ (8,707)	$ 16,541

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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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