Schedule II - Schedule of Valuation and Qualifying Accounts Disclosure (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Allowance for Doubtful Notes [Member]
Balance at Beginning of Period			$ 363
Additions (Reductions) Charged to Operations			(363)
Deductions Other	[1]
Balance at end of Period
Allowance for Notes Receivable [Member]
Balance at Beginning of Period		869	1,646
Additions (Reductions) Charged to Operations
Deductions Other	[1]		(777)
Balance at end of Period		869	869
Valuation Allowance, Other Tax Carryforward [Member]
Balance at Beginning of Period		42,165	64,480
Additions (Reductions) Charged to Operations
Deductions Other	[1]	1,402	(22,315)
Balance at end of Period		$ 43,567	$ 42,165

[1] Includes payments and actual write offs, as well as changes in estimates in the reserves.