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Accounting pronouncements recently adopted	12 Months Ended
Accounting pronouncements recently adopted	Dec. 31, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Accounting pronouncements recently adopted	Accounting pronouncements recently adopted a) Inventory In July 2015, the Financial Accounting Standard Board ("FASB") issued Accounting Standard Update ("ASU") No. 2015-11, Inventory (Topic 330): Simplifying the Measurement of Inventory. This accounting standard simplifies the subsequent measurement of inventory by requiring inventory to be measured at the lower of cost and net realizable value from the lower of cost or market. This standard was adopted January 1, 2017 and the adoption did not have a material effect on the Company's consolidated financial statements. b) Accounting Changes and Error Corrections In January 2017, the FASB issued ASU 2017-03, Accounting Changes and Error corrections (Topic 250) and investments - Equity Method and Joint ventures (Topic 323) to enhance disclosures of new accounting standards, including a comparison to current accounting policies, and the progress status of implementation.This ASU applies to ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606); ASU No. 2016-02, Leases (Topic 842); and ASU 2016-03, Financial Instruments - Credit Losses (Topic 326). This standard was effective upon issuance and has been adopted by the Company.