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Other Investments (Details) - USD ($) $ in Thousands | 2 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Aug. 01, 2018 | Dec. 31, 2017
Equity Securities without Readily Determinable Fair Value [Line Items] |  |  |  |
Other investments held | $ 14,300 | $ 14,300 |  | $ 0
Payments to acquire partnership interests |  | 167 |  |
Additional investment | 2,700 | $ 2,700 |  |
Impairment charges | $ 0 |  |  |
Capella Merger |  |  |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |  |  |
Other investments held |  |  | $ 14,100 |
Certain Limited Partnerships | Maximum |  |  |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |  |  |
Partnership interest (as a percentage) | 5.00% |  |  |

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- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117539-209714 + Details
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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- Definition Cash outflow related to the acquisition or continued holding of limited partnership interests held for investment purposes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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