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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Net income $ 724,847 $ 685,866 $ 659,571
Change in unrealized losses on marketable securities:      
Unrealized losses arising during the period, net of tax benefit of $1,075, $2,032 and $271, respectively (2,793) (5,209) (604)
Gains reclassified into earnings, net of tax (benefits) expense of $728, $(3) and $84, respectively (2,265) (19) (204)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total (5,058) (5,228) (808)
Change in unrealized gains (losses) on cash flow hedges:      
Unrealized gains (losses) arising during the period, net of tax (expense) benefit of $(30), $(136) and $882, respectively 159 716 (4,629)
Losses (gains) reclassified into earnings, net of tax (benefit) expense of $(19), $254 and $471, respectively (101) 1,332 2,528
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total 58 2,048 (2,101)
Other comprehensive loss, net of tax (5,000) (3,180) (2,909)
Comprehensive income $ 719,847 $ 682,686 $ 656,662