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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Unrealized gain (loss) on marketable securities, tax benefit (expense)	$ 2,783	$ 2,056	$ 1,075
Reclassification of unrealized losses (gains) expense (benefit) on marketable securities to income, tax expense	(416)	(41)	728
Unrealized gains (losses) on cash flow hedges, tax expense (benefit)	(624)	561	30
Reclassification of unrealized losses (gains) on cash flow hedges to earnings, tax expense (benefit)	$ (556)	$ 559	$ 19

X

- Definition

Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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