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Income Tax (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 132 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2032
Dec. 31, 2031
Dec. 31, 2030
Dec. 31, 2029
Dec. 31, 2028
Dec. 31, 2027
Dec. 31, 2026
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Apr. 30, 2011
Dec. 31, 2010
Deferred income tax benefit/(expense) $ 20,147 $ (35,522) $ (15,375)                                            
Deferred Tax Assets, Valuation Allowance 41,817 29,291 41,817                                         6,086 31,886
Valuation allowance for future tax assets (41,817) (29,291) (41,817)                                         (6,086) (31,886)
Operating Loss Carryforwards 77,280   77,280 10,786 7,214 6,868 5,993 6,964 2,547 2,240 2,362 2,082 691 4,604 9,564 3,316 1,720 6,314 545 140 1,605 1,060 665    
Non-deductible share issuance expense 13,721                                                
Australia [Member]
                                                  
Operating Loss Carryforwards 59,761   59,761                                            
Capital Loss Canada [Member]
                                                  
Operating Loss Carryforwards $ 21,039   $ 21,039