Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Mar. 31, 2018
Loans Receivable:
Mezzanine	$ 269,299	$ 22,105
Loans receivable, other	188,418	24,990
Unamortized discounts, fees and costs	(596)	(83)
Allowance for loan losses	(143,795)	0
Loans receivable, net	313,326	47,012
Loans receivable commitments	115,000
Real Estate Secured
Loans Receivable:
Mezzanine	0	0
Loans receivable, other	188,418	24,990
Unamortized discounts, fees and costs	0	0
Allowance for loan losses	0	0
Loans receivable, net	188,418	24,990
Other Secured
Loans Receivable:
Mezzanine	269,299	22,105
Loans receivable, other	0	0
Unamortized discounts, fees and costs	(596)	(83)
Allowance for loan losses	(143,795)	0
Loans receivable, net	$ 124,908	$ 22,022

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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- 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.

+ References

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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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- Definition

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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