CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Net income		$ 55,887	$ 84,498
Other comprehensive income (loss), net of tax
Change in fair value of investments in available-for-sale securities, net of tax		107	(38)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax		124	0
Total change in unrealized gains (losses) on investments in available-for-sale securities, net of tax	[1]	(17)	(38)
Unrealized gains (losses) on cash flow hedges		0	5,668
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax		(1,821)	(669)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	[2]	(1,821)	4,999
Total other comprehensive income (loss), net of tax		(1,838)	4,961
Comprehensive income		$ 54,049	$ 89,459

[1] Net of tax of ($9) and ($20) for the three months ended March 31, 2016 and 2015, respectively.

[2] Net of tax of ($981) and $2,692 for the three months ended March 31, 2016 and 2015, respectively