Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Loans receivable
Mezzanine	$ 21,013	$ 269,299
Loans receivable, other	42,037	188,418
Unamortized premiums (discounts), fees and costs	(52)	(596)
Allowance for loan losses	0	(143,795)
Loans receivable, net	62,998	313,326
Remaining commitments to fund development projects	115,000
Real Estate Secured
Loans receivable
Mezzanine	0	0
Loans receivable, other	42,037	188,418
Unamortized premiums (discounts), fees and costs	0	0
Allowance for loan losses	0	0
Loans receivable, net	42,037	188,418
Other Secured
Loans receivable
Mezzanine	21,013	269,299
Loans receivable, other	0	0
Unamortized premiums (discounts), fees and costs	(52)	(596)
Allowance for loan losses	0	(143,795)
Loans receivable, net	20,961	$ 124,908
UK
Loans receivable
Remaining commitments to fund development projects	$ 73,000

The gross carrying amount of loans receivable that are subordinated to receivables held by other entities.

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The gross carrying amount of loan receivable classified as other.

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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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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at stated interest rates.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

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