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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Unrealized losses on marketable securities, tax benefit $ 1,075 $ 2,032 $ 271
Reclassification of unrealized gains (benefits) expense on marketable securities to income, tax expense 728 (3) 84
Unrealized gain (loss) on cash flow hedges, tax benefit (expense) (30) (136) 882
Reclassification of unrealized losses (gains) on cash flow hedges to earnings, tax (benefit) expense $ (19) $ 254 $ 471