CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (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 (Loss) Attributable to Parent	$ 5,043	$ (7,844)	$ 12,847	$ (18,246)
Other comprehensive income (loss):
Unrealized gain (loss) on marketable securities, net of tax	(59)	18	(51)	4
Total comprehensive income (loss)	$ 4,984	$ (7,826)	$ 12,796	$ (18,242)