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Summary of Significant Accounting Policies - Other Assets (Details) - USD ($) $ in Millions | 3 Months Ended |
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Mar. 31, 2019 | Dec. 31, 2018
Summary of Significant Accounting Policies |  |
Non-controlling investment |  | $ 1.8
Non-cash impairment charge on investments | $ 1.8 |

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- Definition Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value. + References No definition available. + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=124260329&loc=SL6284422-111562 + Details
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