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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net income $ 821,305 $ 802,923 $ 724,847
Change in unrealized losses on marketable securities:      
Unrealized losses arising during the period, net of tax benefit of $2,783, $2,056 and $1,075, respectively (9,757) (6,537) (2,793)
Losses (gains) reclassified into earnings, net of tax expense (benefit) of $(416), $(41) and $728, respectively 1,387 135 (2,265)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total (8,370) (6,402) (5,058)
Change in unrealized gains (losses) on cash flow hedges:      
Unrealized gains (losses) arising during the period, net of tax expenses (benefit) of $(624), $561 and $30, respectively (4,574) 4,114 159
Losses (gains) reclassified into earnings, net of tax expenses (benefit) of $(556), $559 and $19, respectively 4,081 (4,096) (101)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total (493) 18 58
Other comprehensive loss, net of tax (8,863) (6,384) (5,000)
Comprehensive income $ 812,442 $ 796,539 $ 719,847