Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Consolidated Statements of Operations [Abstract]
General and administrative expenses	$ (8,745)	$ (1,725)	$ (12,374)	$ (5,174)
Recovery of affiliate doubtful receivable	0	5,854	0	5,854
Operating (loss) income	(8,745)	4,129	(12,374)	680
Interest and investment income	2	16	5	1,045
Interest expense	(8)	(9)	(19)	(20)
Other expense	(2,362)	(2,300)	(6,834)	(6,440)
(Loss) income before income taxes and equity in net (loss) income of affiliates	(11,113)	1,836	(19,222)	(4,735)
Income tax (provision) benefit	829	(309)	1,252	(956)
Income (loss) before equity in net income (loss) of affiliates	(10,284)	1,527	(17,970)	(5,691)
Equity in net (loss) income of affiliates	(14,924)	49,645	44,969	9,086
Net (loss) income	(25,208)	51,172	26,999	3,395
Other comprehensive income (loss), net of tax	8,343	(7,220)	4,742	6,891
Comprehensive (loss) income	$ (16,865)	$ 43,952	$ 31,741	$ 10,286
Net (loss) income per share:
Basic	$ (0.81)	$ 1.65	$ 0.87	$ 0.11
Diluted	$ (0.81)	$ 1.64	$ 0.83	$ 0.11
Weighted average common shares outstanding:
Basic	30,933	30,933	30,933	30,933
Diluted	30,933	31,026	31,032	31,017