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Acquisitions Wharf gold mine (Details) - Wharf Gold Mine [Member]
$ in Thousands
Feb. 20, 2015
USD ($)
Business Acquisition [Line Items]  
Payments to Acquire Businesses, Gross $ 99,400
Business Acquisition, Transaction Costs 2,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 133,269
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities 33,873
Business Combination, Consideration Transferred $ 99,396