CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
General and administrative expense	$ 3,057	$ 5,589
Operating loss	(3,057)	(5,589)
Other loss, net	(1,885)	(1,435)
Interest income	873	798
Interest expense	(2,535)	(2,690)
Equity income, net	28,267	2,746
Net income (loss) before income taxes	21,663	(6,170)
Income tax benefit (expense)	0	0
Net income (loss)	$ 21,663	$ (6,170)
Net income (loss) per share:
Basic (in dollars per share)	$ 1.05	$ (0.30)
Diluted (in dollars per share)	$ 1.05	$ (0.30)
Weighted average shares used in computing income (loss) per share:
Basic (in shares)	20,585	20,506
Diluted (in shares)	20,585	20,506