Condensed Consolidated Statements of Comprehensive (Loss) Income (As Restated [Member], USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
As Restated [Member]
Net (loss) income	$ (9,721,000)	$ 18,350,000	$ (15,157,000)	$ 65,187,000
Other comprehensive (loss) income, net of tax:
Unrealized gain (loss) on securities	99,000	(369,000)	967,000	(301,000)
Foreign currency translation adjustment	57,000	3,000	171,000	3,000
Income tax	(37,000)		(361,000)
Other comprehensive income (loss), net	119,000	(366,000)	777,000	(298,000)
Total comprehensive (loss) income	$ (9,602,000)	$ 17,984,000	$ (14,380,000)	$ 64,889,000