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Disclosures About Fair Value of Financial Instruments (Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Assets    
Cash equivalents $ 93,541 $ 132,040
Short-term Investments 19,588  
Derivatives 35,378  
Total Assets 148,507 132,040
Liabilities    
Derivatives 23,545 30,591
Share-based compensation 1,483 512
Secured loan agreement   164,385
Total Liabilities 25,028 195,488
Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]    
Assets    
Cash equivalents 93,541 132,040
Short-term Investments 0  
Derivatives 0  
Total Assets 93,541 132,040
Liabilities    
Derivatives 0 0
Share-based compensation 0 0
Secured loan agreement   0
Total Liabilities 0 0
Significant Other Observable Inputs (Level 2) [Member]    
Assets    
Cash equivalents 0 0
Short-term Investments 19,588  
Derivatives 35,378  
Total Assets 54,966 0
Liabilities    
Derivatives 23,545 30,591
Share-based compensation 1,483 512
Secured loan agreement   164,385
Total Liabilities 25,028 195,488
Significant Unobservable Inputs (Level 3) [Member]    
Assets    
Cash equivalents 0 0
Short-term Investments 0  
Derivatives 0  
Total Assets 0 0
Liabilities    
Derivatives 0 0
Share-based compensation 0 0
Secured loan agreement   0
Total Liabilities $ 0 $ 0