Statements Of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statements Of Comprehensive Loss
Net loss	$ (37,131)	$ (72,990)	$ (30,495)	$ (93,672)
Other comprehensive income:
Unrealized gain on available for sale securities, net of taxes	41	7	89	25
Other comprehensive income	41	7	89	25
Comprehensive loss	$ (37,090)	$ (72,983)	$ (30,406)	$ (93,647)