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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 73,681	$ 55,912
Other comprehensive income, net of tax:
Unrealized gains on available-for-sale securities and restricted cash equivalents, net of taxes of $8 and $242 for March 31, 2018 and 2017, respectively	24	393
Unrealized gains (losses) on hedging derivatives, net of taxes of $57 and $3 for March 31, 2018 and 2017, respectively	174	(5)
Comprehensive income	$ 73,879	$ 56,300

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities and restricted cash equivalents.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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