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Subsequent Events (Details)		1 Months Ended	9 Months Ended
	Oct. 05, 2018 USD ($) $ / shares	Oct. 24, 2018 USD ($)	Sep. 30, 2018 USD ($) $ / shares	Sep. 30, 2017 USD ($)	Oct. 02, 2018 $ / shares
Subsequent Event [Line Items]
Proceeds from issuance of convertible senior notes			$ 0	$ 227,700,000
Share price (in dollars per share) | $ / shares			$ 18.87
Subsequent Event [Member]
Subsequent Event [Line Items]
Proceeds from loan repayments		$ 180,900,000
Commercial Mortgage Portfolio Segment [Member]
Subsequent Event [Line Items]
Funded amount of mortgages			$ 23,900,000
Commercial Mortgage Portfolio Segment [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Original face amount		387,000,000
Funded amount of mortgages		$ 273,200,000
Convertible Debt [Member]
Subsequent Event [Line Items]
Principal amount			$ 380,932,000
2023 Notes [Member] | Convertible Debt [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Principal amount	$ 230,000,000.0
Proceeds from issuance of convertible senior notes	$ 223,700,000
Stated interest rate	5.375%
Conversion rate	0.0487187
Conversion price (in dollars per share) | $ / shares	$ 20.53
Conversion premium (as a percent)	10.00%
Common Stock [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Share price (in dollars per share) | $ / shares					$ 18.66
Over-Allotment Option [Member] | 2023 Notes [Member] | Convertible Debt [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Principal amount	$ 30,000,000.0

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