CONSOLIDATED STATEMENTS OF OTHER COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
CONSOLIDATED STATEMENTS OF OTHER COMPREHENSIVE INCOME
Net income	$ 53,649	$ 10,645	$ 306,960	$ 11,809
Other comprehensive income (loss) before tax:
Reduction of unrealized gain related to cash flow hedging instruments included in net income	0	(1,106)	0	(1,709)
Unrealized gain (loss) on marketable securities, available-for-sale:
Unrealized gain (loss) during the period	433	225	(201)	1,158
Less: reclassification adjustments for losses (gains) included in net income	253	(9)	(88)	(22)
Total unrealized gain (loss) on marketable securities, available-for-sale	686	216	(289)	1,136
Other comprehensive income (loss) before tax	686	(890)	(289)	(573)
Income tax benefit related to items of other comprehensive income (loss)	0	423	0	653
Other comprehensive income (loss), net of tax	686	(467)	(289)	80
Comprehensive income	$ 54,335	$ 10,178	$ 306,671	$ 11,889