Related Party Transactions (Unaudited Financial Information from Significant Equity Investees) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Related Party Transactions [Abstract]
Revenues	$ 122,862	$ 1,459,331
Gross profit	4,021	56,096
Income (loss) from continuing operations	1,963	8,908
Net income (loss)	1,963	9,462
Net income (loss) attributable to Companies	$ 1,963	$ 9,462

Equity Method Investment, Summarized Financial Information, Net Income (Loss) Attributable to Investee

No definition available.

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- Definition

The amount of gross profit (loss) reported by an equity method investment of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount of income (loss) from continuing operations reported by an equity method investee.

+ References

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- Definition

The amount of net income (loss) reported by an equity method investment of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

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