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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Statement of Comprehensive Income [Abstract] |  |
Net income | $ 126,254 | $ 94,943
Other comprehensive income (loss): |  |
Unrealized losses on investments | (4,127) | (1,567)
Unrealized gains on cash flow hedges | 20,290 | 4,779
Total unrealized gains | 16,163 | 3,212
Income tax expense | (3,902) | (1,232)
Other comprehensive income, net of tax expense | 12,261 | 1,980
Total comprehensive income | $ 138,515 | $ 96,923

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