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INTERIM CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss):	$ (2,182)	$ 4,107
Available-for-sale securities:
Changes in unrealized losses	(680)	169
Reclassification adjustments for (gains) losses included in net income	(4)	38
Net change	(684)	207
Cash flow hedges:
Changes in unrealized gains (losses)	(24)	182
Reclassification adjustments for (gains) losses included in net income	19	(146)
Net change	(5)	36
Other comprehensive income (loss) before tax	(689)	243
Income tax expense (benefit) related to components of other comprehensive income (loss)	(87)	35
Other comprehensive income (loss), net of taxes	(602)	208
Comprehensive income (loss)	$ (2,784)	$ 4,315

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