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Notes Receivable (Details 1)
number in Thousands, CAD in Thousands
12 Months Ended
Feb. 21, 2011
CAD
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Aug. 13, 2014
USD ($)
Mar. 31, 2012
USD ($)
Mar. 31, 2012
CAD
Foreign Currency Exchange Rate, Translation   (254)          
Proceeds from Collection of Notes Receivable   $ 466,000 $ 893,000 $ 0      
Adjustment to purchase price of acquisition           $ 2,681,000  
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High         $ 5,000,000    
SM Canada [Member]              
Foreign Currency Exchange Rate, Translation   254 (400)        
Payments to Acquire Businesses, Gross | CAD CAD 26,686            
Financing Receivable, Gross           3,171,000 CAD 3,107
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High           $ 37,327,000 CAD 38,000