CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 5,576	$ 8,624	$ 31,677	$ 29,726
Bond related changes:
Net unrealized gains	961	1,025	997	2,143
Reclassification of fair value gains on sold or redeemed bonds into the Consolidated Statements of Operations	(1,851)	(5,080)	(26,115)	(5,080)
Reclassification of credit-related gains to the Consolidated Statements of Operations related to bond investments assessed as other-than-temporary-impairment ("OTTI")	0	141	0	6
Reinstatement of fair value gains related to bond investments due to deconsolidation of consolidated property partnerships	0	0	0	9,415
Net change in other comprehensive (loss) income due to bonds	(890)	(3,914)	(25,118)	6,484
Income tax benefit	0	14	0	0
Foreign currency translation adjustment	217	525	162	3,348
Other comprehensive (loss) income	(673)	(3,375)	(24,956)	9,832
Comprehensive income	$ 4,903	$ 5,249	$ 6,721	$ 39,558