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Debt - Narrative (Details) - USD ($)	Jan. 23, 2017	Mar. 31, 2019	Dec. 31, 2018
Mortgages | KRVI | VIE, Primary Beneficiary
Debt Instrument [Line Items]
Interest rate		7.00%
Long-term debt, gross		$ 3,986,000
Unused borrowing capacity		4,400,000
6.25% senior convertible notes due 2022 | Convertible Notes
Debt Instrument [Line Items]
Face amount	$ 138,000,000
Interest rate	6.25%
Proceeds from issuance of convertible notes	$ 127,000,000
Debt issuance cost, percentage	8.24%
Unamortized debt issuance costs		$ 6,700,000	$ 7,200,000
Effective interest rate	96.00%
Conversion ratio	0.1427144
Conversion price (in dollars per share)	$ 7.01
6.25% senior notes due 2022, over-allotment option | Convertible Notes
Debt Instrument [Line Items]
Face amount	$ 18,000,000

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