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Fair Value Measurements and Derivative Instruments Reporting (Narrative) (Details)
CAD in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2017
CAD
Jun. 30, 2017
USD ($)
Apr. 30, 2015
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Cash equivalents         $ 0   $ 0  
Operating expenses $ 33,689,000 $ 30,660,000 $ 65,596,000 $ 59,807,000        
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   $ 0  
Operating expenses         $ 400,000      
BMO Credit Agreement [Member] | Interest Rate Swap Liability [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt instrument maturity date     Aug. 01, 2019          
Notional Value           CAD 8.4   $ 6,500,000
CDOR exchange rate           3.92 3.92