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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net income (loss)	$ 34,108	$ (67,720)
Other comprehensive income (loss)
Change in net unrealized gain during the period	8,194	19,207
Reclassification adjustments for gains included in income	(1,595)	(3,131)
Reclassification adjustments for foreign currency translation gains	216	335
Amortization of losses previously held as available-for-sale	25	25
Net unrealized gain	6,840	16,436
Deferred tax expense
Change in net unrealized gain during the period	3,278	7,683
Reclassification adjustments for gains included in income	(638)	(1,252)
Amortization of losses previously held as available-for-sale	10	10
Income tax expense related to items of other comprehensive income	2,650	6,441
Other comprehensive income net of tax and reclassifications into net income	4,190	9,995
Comprehensive income (loss)	$ 38,298	$ (57,725)

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