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Fair Value Measurements and Derivative Instruments Reporting (Narrative) (Details)
$ in Millions
Mar. 31, 2018
CAD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of land lease $ 28.6 $ 22,200,000  
Cash equivalents   0 $ 0
Katowice Leashold Improvements [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets measured at fair value on a nonrecurring basis   $ 0