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Debt - Narrative (Details) - USD ($)		6 Months Ended
	Jan. 23, 2017	Jun. 30, 2018	Jun. 30, 2017
Debt Instrument [Line Items]
Proceeds from issuance of convertible notes		$ 0	$ 126,995,000
Convertible Notes | 6.25% senior convertible notes due 2022
Debt Instrument [Line Items]
Face amount	$ 138,000,000
Stated interest rate	6.25%
Proceeds from issuance of convertible notes	$ 127,000,000
Debt issuance cost, percentage	8.24%
Effective interest rate	96.00%
Conversion ratio	0.1427144
Conversion price (in dollars per share)	$ 7.01
Convertible Notes | 6.25% senior notes due 2022, over-allotment option
Debt Instrument [Line Items]
Face amount	$ 18,000,000
Mortgages | KRVI | VIE, Primary Beneficiary
Debt Instrument [Line Items]
Stated interest rate		6.50%
Long-term debt, gross		$ 5,026,000
Unused borrowing capacity		$ 3,400,000

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

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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