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Fair Value of Financial Instruments - Carrying Value and Estimated Fair Value of Company's Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Carrying Value [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cash	$ 99,188	$ 77,671
Carrying Value [Member] | Level 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Secured debt arrangements	(2,013,617)	(1,345,195)
Estimate of Fair Value Measurement [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cash	99,188	77,671
Estimate of Fair Value Measurement [Member] | Level 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Secured debt arrangements	(2,013,617)	(1,345,195)
Commercial Mortgage Portfolio Segment [Member] | Carrying Value [Member] | Level 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,723,550	2,653,826
Commercial Mortgage Portfolio Segment [Member] | Estimate of Fair Value Measurement [Member] | Level 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,720,475	2,657,262
Subordinate Mortgage Portfolio Segment [Member] | Carrying Value [Member] | Level 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,104,496	1,025,932
Subordinate Mortgage Portfolio Segment [Member] | Estimate of Fair Value Measurement [Member] | Level 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,098,632	1,029,390
2019 Notes [Member] | Carrying Value [Member] | Level 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes	(35,477)	(251,935)
2019 Notes [Member] | Estimate of Fair Value Measurement [Member] | Level 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes	(39,660)	(267,506)
2022 Notes [Member] | Carrying Value [Member] | Level 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes	(334,697)	(332,962)
2022 Notes [Member] | Estimate of Fair Value Measurement [Member] | Level 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes	$ (345,863)	$ (350,175)

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- Definition

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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- Definition

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

+ References

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- Definition

Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

+ References

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- Definition

Fair value portion of mortgage loans held-for-sale.

+ References

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