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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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- Definition 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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