EQUITY (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Debt Securities [Abstract]
Reclassification of fair value gains on sold or redeemed bonds into the Consolidated Statements of Operations	$ (20,693)		$ 0		$ (24,264)	$ 0
Reinstatement of fair value gains related to bond investments due to deconsolidation of consolidated property partnerships	0		0		0	9,415
Income tax expense						(14)
Net change in AOCI	(21,143)	$ (3,140)	4,047	$ 9,160
Investments in Debt Securities
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Debt Securities [Abstract]
Beginning Balance	34,460	37,625	50,392	44,459	37,625	44,459
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)				(24,264)
Reclassification of credit-related losses to the Consolidated Statements of Operations related to bond investments assessed as OTTI						(135)
Reinstatement of fair value gains related to bond investments due to deconsolidation of consolidated property partnerships						9,415
Net change in AOCI	(21,063)		4,465		(24,228)	10,398
Ending Balance	13,397	34,460	54,857	50,392	13,397	54,857
Income Tax (Expense) Benefit
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Debt Securities [Abstract]
Beginning Balance			(256)
Income tax expense			242
Net change in AOCI			242
Ending Balance			(14)	(256)		(14)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Debt Securities [Abstract]
Beginning Balance	97	72	177	(3,306)	72	(3,306)
Net unrealized (losses) gains	(80)		(660)		(55)	2,823
Net change in AOCI	(80)		(660)		(55)	2,823
Ending Balance	17	97	(483)	177	17	(483)
AOCI
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Debt Securities [Abstract]
Beginning Balance	34,557	37,697	50,313	41,153	37,697	41,153
Net unrealized (losses) gains	(450)		3,805		(19)	3,941
Reclassification of fair value gains on sold or redeemed bonds into the Consolidated Statements of Operations	(20,693)				(24,264)
Reclassification of credit-related losses to the Consolidated Statements of Operations related to bond investments assessed as OTTI						(135)
Reinstatement of fair value gains related to bond investments due to deconsolidation of consolidated property partnerships						9,415
Income tax expense			242			(14)
Net change in AOCI	(21,143)		4,047		(24,283)	13,207
Ending Balance	$ 13,414	$ 34,557	$ 54,360	$ 50,313	$ 13,414	$ 54,360