CONSOLIDATED STATEMENTS OF OTHER COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
CONSOLIDATED STATEMENTS OF OTHER COMPREHENSIVE INCOME
Net income	$ 48,528	$ 53,649	$ 104,097	$ 306,960
Other comprehensive (loss) income, net of tax:
Amortization of actuarial loss on defined benefit pension plan, net	4	0	13	0
Unrealized (loss) gain on marketable securities, available-for-sale, net	(224)	686	200	(289)
Other comprehensive (loss) income, net of tax	(220)	686	213	(289)
Comprehensive income	$ 48,308	$ 54,335	$ 104,310	$ 306,671