CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
General and administrative expense	$ 4,754	$ 5,069	$ 9,634	$ 10,308
Operating loss	(4,754)	(5,069)	(9,634)	(10,308)
Other income (loss), net	(15)	1,452	(403)	31,826
Interest income	640	542	1,089	1,012
Interest expense	(1,128)	(1,098)	(2,250)	(2,192)
Equity income (loss)	(13,765)	(3,175)	(22,427)	3,633
Net income (loss) before income taxes	(19,022)	(7,348)	(33,625)	23,971
Income tax benefit (expense)	0	0	0	0
Net loss	$ (19,022)	$ (7,348)	$ (33,625)	$ 23,971
Net income (loss) per share:
Basic (in dollars per share)	$ (0.91)	$ (0.35)	$ (1.61)	$ 1.13
Diluted (in dollars per share)	$ (0.91)	$ (0.35)	$ (1.61)	$ 1.06
Weighted average shares used in computing income (loss) per share :
Basic (in shares)	20,895	20,771	20,878	21,226
Diluted (in shares)	20,895	20,771	20,878	24,653