CONSOLIDATED STATEMENTS OF OTHER COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
CONSOLIDATED STATEMENTS OF OTHER COMPREHENSIVE INCOME
Net income	$ 231,194	$ 6,272	$ 253,311	$ 1,164
Other comprehensive (loss) income before tax:
Reduction of unrealized gain related to cash flow hedging instruments included in net income	0	(301)	0	(603)
Unrealized (loss) gain on marketable securities, available-for-sale:
Unrealized (loss) gain during the period	(662)	139	(634)	933
Less: reclassification adjustments for gains included in net income	(189)	(80)	(341)	(13)
Total unrealized (loss) gain on marketable securities, available-for-sale	(851)	59	(975)	920
Other comprehensive (loss) income before tax	(851)	(242)	(975)	317
Income tax benefit related to items of other comprehensive (loss) income	0	115	0	230
Other comprehensive (loss) income, net of tax	(851)	(127)	(975)	547
Comprehensive income	$ 230,343	$ 6,145	$ 252,336	$ 1,711