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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Other Commitments [Line Items] |  |
Reinsurance payable, net | $ 93,306 | $ 110,381
June 1 2019 - May 31 2020 |  |
Other Commitments [Line Items] |  |
Reinsurance payable, net | 82,300 |
June 1 2020 - May 31 2021 |  |
Other Commitments [Line Items] |  |
Reinsurance payable, net | $ 33,900 |

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- Definition 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. + References No definition available. + Details
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- Definition The carrying amount as of the balance sheet date of the known and estimated amounts owed to insurers under reinsurance treaties or other arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.13(a)(3),(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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