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Income Tax (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 132 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Apr. 30, 2011
Deferred income tax benefit/(expense) $ 15,373 $ 20,147 $ (35,522) $ (2)  
Deferred Tax Assets, Valuation Allowance 43,955 41,817 29,291 41,817 6,086
Valuation allowance for future tax assets (43,955) (41,817) (29,291) (41,817) (6,086)
Operating Loss Carryforwards 70,459        
Non-deductible share issuance expense 16,300        
Australia [Member]
          
Operating Loss Carryforwards 63,113        
Capital Loss Canada [Member]
          
Operating Loss Carryforwards $ 40,291