Condensed Consolidated Statements of Comprehensive Income (Unuaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 103,275	$ 53,024	$ 132,162	$ 108,963
Other comprehensive income (loss):
Change in foreign currency translation adjustment	0	(2,006)	0	(2,727)
Available for sale securities:
Change in net unrealized (losses) gains	(896)	569	1,298	729
Less: reclassification adjustment for net gains included in net income	(136)	(702)	(68)	(865)
Net change (net of tax effect)	(1,032)	(133)	1,230	(136)
Cash flow hedges:
Change in unrealized gains (losses)	2,347	1,292	(3,344)	2,612
Less: reclassification adjustment for net losses (gains) included in net income	5,421	(1,651)	9,668	(2,948)
Net change (net of tax effect)	7,768	(359)	6,324	(336)
Other comprehensive income (loss)	6,736	(2,498)	7,554	(3,199)
Comprehensive income	$ 110,011	$ 50,526	$ 139,716	$ 105,764