SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Principal Balance	16,033
Book Value	15,083
Aggregate cost for federal income tax purposes	16,200
Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at the beginning of the year	39,026	$ 241,038	$ 209,275
Additions during period:
Draws	1,738	0	8,713
New mortgage loans	12,987	3,767	20,411
Interest income added to principal	539	690	2,639
Deductions during period:
Paydowns/repayments	(14,570)	(193,075)	0
Conversion to real property	(19,085)	(10,100)	0
Write-offs	(4,602)	(3,294)	0
Balance at the end of the year	$ 16,033	$ 39,026	$ 241,038
Mortgages \| South Tampa
Mortgage Loans on Real Estate [Line Items]
Contractual Interest Rate	9.80%
Prior Liens	$ 0
Principal Balance	5,358
Book Value	$ 4,342
Mortgages \| River Vista
Mortgage Loans on Real Estate [Line Items]
Contractual Interest Rate	10.00%
Prior Liens	$ 0
Principal Balance	8,008
Book Value	$ 8,008
Construction Mortgages \| McKinney
Mortgage Loans on Real Estate [Line Items]
Contractual Interest Rate	8.00%
Prior Liens	$ 0
Principal Balance	2,453
Book Value	$ 2,499
Construction Mortgages \| Arlington
Mortgage Loans on Real Estate [Line Items]
Contractual Interest Rate	8.00%
Prior Liens	$ 0
Principal Balance	214
Book Value	$ 234

Mortgage Loans On Real Estate, Additions [Abstract]

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Mortgage Loans On Real Estate, Conversion To Real Property

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Mortgage Loans On Real Estate, Deductions [Abstract]

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Mortgage Loans On Real Estate, Write-Downs

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Total carrying amount of mortgage loans as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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The carrying amount of the outstanding balance due under the mortgage loan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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The amount of principal collected on mortgage loans on real estate during the reporting period.

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-Publisher FASB
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Amount of the contractual principal due at the origination of the mortgage loan (face amount).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of the federal income tax basis of mortgage loans on real estate.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Total amount of new mortgage loans on real estate during the reporting period.

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Total amount of additions to mortgage loans other than new loans during the reporting period.

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Amount of increase (decrease) in mortgage loans on real estate.

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Amount of prior lien on the real estate that secures the mortgage loan.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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