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Debt - Narrative (Details)		9 Months Ended
	Jan. 23, 2017 USD ($) $ / shares	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of convertible notes, net		$ 126,995,000	$ 0
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, net	$ 127,000,000
Effective interest rate	96.00%
Conversion ratio	0.1427144
Conversion price (in dollars per share) | $ / shares	$ 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		6.00%
Long-term debt, gross		$ 6,013,000
Unused borrowing capacity		$ 2,400,000

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Debt Instrument, Issuance Percentage of Face Amount

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher FASB
-Name Accounting Standards Codification
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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