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Debt - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jan. 23, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Proceeds from issuance of convertible notes		$ 126,995	$ 0	$ 0
Convertible Notes | 6.25% senior convertible notes due 2022
Debt Instrument [Line Items]
Face amount	$ 138,000
Interest rate	6.25%
Proceeds from issuance of convertible notes	$ 127,000
Cost of debt, percentage	8.24%
Effective interest rate	96.00%
Convertible note, 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
Mortgages | KRVI | VIE, Primary Beneficiary
Debt Instrument [Line Items]
Interest rate		6.00%
Long-term debt, gross		$ 6,045
Unused borrowing capacity		$ 2,400

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

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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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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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