CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 23,219	$ 2,762	$ 26,101	$ 21,102
Bond related changes:
Net unrealized (losses) gains	(370)	4,465	36	1,118
Reclassification of fair value gains on sold or redeemed bonds into the Consolidated Statements of Operations	(20,693)	0	(24,264)	0
Reclassification of credit-related gains to the Consolidated Statements of Operations related to bond investments assessed as other-than-temporary-impairment ("OTTI")	0	0	0	(135)
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	(21,063)	4,465	(24,228)	10,398
Income tax benefit (expense)	0	242	0	(14)
Foreign currency translation adjustment	(80)	(660)	(55)	2,823
Other comprehensive (loss) income	(21,143)	4,047	(24,283)	13,207
Comprehensive income	$ 2,076	$ 6,809	$ 1,818	$ 34,309