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Earnings (Loss) Before Income Taxes Composition in Each Tax Jurisdiction (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings (Loss) Before Income Taxes Composition in Each Tax Jurisdiction [Abstract]
Earnings before income taxes	$ 40,954	$ 80,666	$ 92,488

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- Definition

Earnings (Loss) Before Income Taxes Composition in Each Tax Jurisdiction [Abstract]

+ References

No definition available.

+ Details

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- Definition

Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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