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Investments Investment Balances (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Investments [Abstract] |  |
Joint ventures | $ 486,032 | $ 499,756
Nonmarketable securities | 9,177 | 3,655
Marketable equity securities | 33,513 | 30,653
Total | $ 528,722 | $ 534,064

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- Definition Amount of investment in equity method investee and investment in and advance to affiliate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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