Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) [Abstract]
General and administrative expenses	$ (1,281)	$ (3,452)	$ (3,957)	$ (10,559)
Operating income (loss)	(1,281)	(3,452)	(3,957)	(10,559)
Interest and investment income	91	307	492	939
Interest expense	(3)	(5)	(10)	(13)
Other income (expense)	(450)	(215)	(2,026)	(586)
Income (loss) from continuing operations before income taxes and equity in net income (loss) of affiliates	(1,643)	(3,365)	(5,501)	(10,219)
Income tax (provision) benefit	(4,954)	7,589	(25,106)	2,604
Income (loss) from continuing operations before equity in net income (loss) of affiliates	(6,597)	4,224	(30,607)	(7,615)
Equity in net income (loss) of affiliates	(19,283)	33,358	42,911	26,209
Income (loss) from continuing operations	(25,880)	37,582	12,304	18,594
Income (loss) from discontinued operations, net of tax provision	(6,440)	(1,987)	(6,448)	(4,352)
Net income (loss)	(32,320)	35,595	5,856	14,242
Other comprehensive income (loss), net of tax	1,543	526	2,592	2,389
Comprehensive income (loss)	$ (30,777)	$ 36,121	$ 8,448	$ 16,631
Basic
Income (loss) from continuing operations	$ (0.84)	$ 1.22	$ 0.40	$ 0.60
Income (loss) from discontinued operations, net of tax	$ (0.21)	$ (0.06)	$ (0.21)	$ (0.14)
Net income (loss)	$ (1.05)	$ 1.16	$ 0.19	$ 0.46
Diluted
Income (loss) from continuing operations	$ (0.84)	$ 1.19	$ 0.38	$ 0.58
Income (loss) from discontinued operations, net of tax	$ (0.21)	$ (0.06)	$ (0.21)	$ (0.14)
Net income (loss)	$ (1.05)	$ 1.13	$ 0.17	$ 0.44
Weighted average common shares outstanding:
Basic	30,920	30,920	30,920	30,827
Diluted	30,920	31,004	31,004	30,997