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Rental Expense And Contractual Commitments (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Leases, Operating [Abstract]      
Rental expenses for continuing operations from the consecutive year $ 4.4 $ 2.9 $ 3.6
Contractual obligations for plant construction and purchases of real property and equipment amounted $ 4.6