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Loans and Investments - Nonaccrual Status Aging (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 loan	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 loan	Dec. 31, 2019 USD ($) loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and investments, net	$ 4,800,176		$ 4,800,176		$ 4,189,960
Troubled debt restructurings, number | loan	0	0	0	0
Interest Reserves
Interest reserve held			$ 54,400		$ 37,000
Number of loans covered under interest reserve | loan	151		151		131
Aggregate UPB covered under interest reserve	$ 2,850,000		$ 2,850,000		$ 2,430,000
Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0		0		0
Loans past due 90 days or more still accruing interest	$ 0		$ 0		$ 0

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- Definition

Carrying amount as of the balance sheet date pertaining to interest reserve funded to cover debt service costs, based on contractual requirements.

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- Definition

Number of loans covered under the interest reserve fund.

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Amount of aggregate unpaid principal balance covered under the interest reserve fund.

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Interest Reserves Abstract

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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Amount of financing receivable 90 days or more past due and still accruing.

+ References

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Amount of financing receivable past due.

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The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

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