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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