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Investments Marketable Equity Securities Gains (Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Marketable Equity Securities Gains (Losses) [Abstract]
Marketable equity securities gain (loss), net	$ 11,328	$ 971
Net gains (losses) recognized on marketable equity securities sold	44	96
Unrealized gains (losses) recognized on marketable equity securities held	$ 11,284	$ 875

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- Definition

Marketable Equity Securities Gains (Losses) [Abstract]

+ References

No definition available.

+ Details

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- Definition

Amount of unrealized and realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

+ References

No definition available.

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- Definition

Amount of realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

+ References

No definition available.

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- Definition

Amount of unrealized gain (loss) on investment in marketable security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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