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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 12 Months Ended
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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

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