Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ 63,087	$ 114,205	$ (193,420)
Other comprehensive income
Unrealized gain on available for sale securities, net of tax	0	212	261
Other comprehensive income	0	212	261
Comprehensive income (loss)	$ 63,087	$ 114,417	$ (193,159)