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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Unrealized losses on marketable securities, tax benefit $ 2,056 $ 1,075 $ 2,032
Reclassification of unrealized losses (gains) expense (benefit) on marketable securities to income, tax expense (41) 728 (3)
Unrealized gains on cash flow hedges, tax expense 561 30 136
Reclassification of unrealized losses (gains) on cash flow hedges to earnings, tax expense (benefit) $ (559) $ (19) $ 254