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Other Investments - Summarized Financial Information of Equity Method Investments (Details) - SAFE - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |
Revenues | $ 21,820 | $ 11,693
Expenses | (10,683) | (7,950)
Net Income Attributable to Parent Entities | $ 6,619 | $ 3,720

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- Definition The amount of the expenses reported by an equity method investment of the entity + References No definition available. + Details
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- Definition The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760 + Details
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