Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) [Abstract]
General and administrative expenses	$ (1,652)	$ (1,281)	$ (5,349)	$ (3,957)
Operating income (loss)	(1,652)	(1,281)	(5,349)	(3,957)
Interest and investment income	15	91	119	492
Interest expense	(5)	(3)	(13)	(10)
Other income (expense)	(164)	(450)	(3,248)	(2,026)
Income (loss) from continuing operations before income taxes and equity in net income (loss) of affiliates	(1,806)	(1,643)	(8,491)	(5,501)
Income tax benefit (provision)	36,934	(4,954)	30,901	(25,106)
Income (loss) from continuing operations before equity in net income (loss) of affiliates	35,128	(6,597)	22,410	(30,607)
Equity in net income (loss) of affiliates	(38,475)	(19,283)	(90,233)	42,911
(Loss) income from continuing operations	(3,347)	(25,880)	(67,823)	12,304
Income (loss) from discontinued operations, net of tax provision	(208)	(6,440)	(574)	(6,448)
Net (loss) income	(3,555)	(32,320)	(68,397)	5,856
Other comprehensive income (loss), net of tax	(698)	1,543	664	2,592
Comprehensive (loss) income	$ (4,253)	$ (30,777)	$ (67,733)	$ 8,448
Net (loss) income per share: Basic
Income (loss) from continuing operations	$ (0.11)	$ (0.84)	$ (2.19)	$ 0.40
Income (loss) from discontinued operations, net of tax	(0.01)	(0.21)	(0.02)	(0.21)
Net income (loss)	(0.12)	(1.05)	(2.21)	0.19
Net (loss) income per share: Diluted
Income (loss) from continuing operations	(0.11)	(0.84)	(2.19)	0.38
Income (loss) from discontinued operations, net of tax	(0.01)	(0.21)	(0.02)	(0.21)
Net income (loss)	$ (0.12)	$ (1.05)	$ (2.21)	$ 0.17
Weighted average common shares outstanding:
Basic	30,933	30,920	30,926	30,920
Diluted	30,933	30,920	30,926	31,004