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Taxation (Components of Income Tax Benefit (Expense)) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Expense (Benefit)                      
Current                 $ (699)us-gaap_CurrentIncomeTaxExpenseBenefit $ (2,005)us-gaap_CurrentIncomeTaxExpenseBenefit $ (1,667)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred                 91us-gaap_DeferredIncomeTaxExpenseBenefit 313us-gaap_DeferredIncomeTaxExpenseBenefit 254us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax (expense) benefit $ (401)us-gaap_IncomeTaxExpenseBenefit $ (245)us-gaap_IncomeTaxExpenseBenefit $ 204us-gaap_IncomeTaxExpenseBenefit $ (166)us-gaap_IncomeTaxExpenseBenefit $ (1,336)us-gaap_IncomeTaxExpenseBenefit $ (223)us-gaap_IncomeTaxExpenseBenefit $ (11)us-gaap_IncomeTaxExpenseBenefit $ (122)us-gaap_IncomeTaxExpenseBenefit $ (608)us-gaap_IncomeTaxExpenseBenefit $ (1,692)us-gaap_IncomeTaxExpenseBenefit $ (1,413)us-gaap_IncomeTaxExpenseBenefit