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Notes Receivable (Details 1)
CAD in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Mar. 31, 2012
USD ($)
Mar. 31, 2012
CAD
Increase (Decrease) in Notes Receivable, Related Parties     $ 71    
Increase (Decrease) in Accrued Interest Receivable, Net $ (16,000) $ (19,000) 71,000    
Notes, Loans and Financing Receivable, Net, Noncurrent $ 1,238,000 $ 1,727,000 $ 1,158,000    
Note Receivable from Seller of SM Canada [Member]          
Notes, Loans and Financing Receivable, Net, Noncurrent       $ 3,085,000 CAD 3,107