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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Comprehensive Income [Abstract]      
Net income $ 685,866 $ 659,571 $ 652,800
Change in unrealized losses on marketable securities:      
Unrealized losses arising during the period, net of tax benefit of $2,032, $271 and $3,369, respectively (5,209) (604) (9,685)
Gains reclassified into earnings, net of tax expense (benefits) of $(3), $84 and $300, respectively (19) (204) (2,011)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total (5,228) (808) (11,696)
Change in unrealized gains (losses) on cash flow hedges:      
Unrealized gains (losses) arising during the period, net of tax benefit (expense) of $(136), $882 and $(452), respectively 716 (4,629) 704
Losses (gains) reclassified into earnings, net of tax benefit (expense) of $(254), $(471) and $592, respectively 1,332 2,528 (1,775)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total 2,048 (2,101) (1,071)
Other comprehensive loss, net of tax (3,180) (2,909) (12,767)
Comprehensive income $ 682,686 $ 656,662 $ 640,033