CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
NET INCOME	$ 64,237	$ 67,132
OTHER COMPREHENSIVE LOSS
Derivative instruments, net of tax (Note 6)	(2,423)	(727)
Available-for-sale securities, net of tax (Note 6)	261	106
TOTAL OTHER COMPREHENSIVE LOSS, NET OF TAX	(2,162)	(621)
TOTAL COMPREHENSIVE INCOME	$ 62,075	$ 66,511