Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 557	$ 32,863	$ 5,931	$ 38,022
Other comprehensive income (loss):
Unrealized gain (loss) on marketable securities, net of income tax expense of $0, $0, $0 and $0	3	0	(10)	0
Foreign currency translation, net of income tax expense (benefit) of $(4), $12, $1 and $21	176	(185)	12	(332)
Comprehensive income	$ 736	$ 32,678	$ 5,933	$ 37,690