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Debt - Narrative (Details)	Jan. 23, 2017 USD ($) $ / shares	Sep. 30, 2019 USD ($) securitization	Dec. 31, 2018 USD ($) securitization
Debt Instrument [Line Items]
Pledged assets		$ 45,672,000	$ 56,795,000
Number of residential CDO securitizations | securitization		3	3
CDOs outstanding		$ 4,800,000	$ 4,800,000
Mortgages | KRVI | VIE, Primary Beneficiary
Debt Instrument [Line Items]
Interest rate		6.50%
Long-term debt, gross		$ 935,000
Unused borrowing capacity		7,500,000
Residential collateralized debt obligations
Debt Instrument [Line Items]
Secured debt, carrying value		$ 42,100,000	$ 53,000,000.0
Weighted average interest rate		2.64%	3.12%
6.25% senior convertible notes due 2022 | Convertible Notes
Debt Instrument [Line Items]
Face amount	$ 138,000,000.0
Proceeds from sale of Convertible Notes	$ 127,000,000.0
Debt issuance cost, percentage	8.24%
Discount and deferred charges, net		$ 5,600,000	$ 7,200,000
Interest rate	6.25%
Notes issued, percentage of principle	96.00%
Conversion ratio	0.1427144
Conversion price (in dollars per share) | $ / shares	$ 7.01
Arm Loans
Debt Instrument [Line Items]
Loans pledged as collateral		48,900,000	60,200,000
Adjustable Rate Residential Mortgage | Residential collateralized debt obligations
Debt Instrument [Line Items]
Pledged assets		$ 45,700,000	$ 56,800,000

X

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Represents Company’s net investment in the residential securitization trusts, which is the maximum amount of the Company’s investment that is at risk to loss and represents the difference between (i) the carrying amount of the mortgage loans and real estate owned held in residential securitization trusts and (ii) the amount of Residential CDOs outstanding.

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Number of Residential Collateralized Debt Obligation Securitizations

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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The price per share of the conversion feature embedded in the debt instrument.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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