Investments Investment Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
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

Nonmarketable securities.

No definition available.

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- References

No definition available.

+ Details

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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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- Definition

The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

+ References

+ Details

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- Definition

Amount of investment in marketable security, classified as noncurrent.

+ References

+ Details

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