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Financial Instruments And Risk Management (Tables)
 12 Months Ended
Dec. 31, 2017
Financial Instruments And Risk Management [Abstract]  
Summary of Net Monetary Assets and Liabilities Held in Foreign Currencies

The table below summarizes the net monetary assets and liabilities held in foreign currencies:

 

 

 

December 31,

2017

 

 

December 31,

2016

 

Canadian dollar net monetary assets

$

 

4,173

 

$

 

12,427

 

Mexican peso net monetary assets

 

 

5,403

 

 

 

2,306

 

 

$

 

9,576

 

$

 

14,733