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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income $ 802,923 $ 724,847 $ 685,866
Change in unrealized losses on marketable securities:      
Unrealized losses arising during the period, net of tax benefit of $2,056, $1,075 and $2,032, respectively (6,537) (2,793) (5,209)
Losses (gains) reclassified into earnings, net of tax expense (benefit) of $(41), $728 and $(3), respectively 135 (2,265) (19)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total (6,402) (5,058) (5,228)
Change in unrealized gains on cash flow hedges:      
Unrealized gains arising during the period, net of tax expense of $561, $30 and $136, respectively 4,114 159 716
Losses (gains) reclassified into earnings, net of tax expense (benefit) of $(559), $(19) and $254, respectively (4,096) (101) 1,332
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total 18 58 2,048
Other comprehensive loss, net of tax (6,384) (5,000) (3,180)
Comprehensive income $ 796,539 $ 719,847 $ 682,686