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Income Tax (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Components of provision for income taxes        
Current $ (330) $ (210) $ (619) $ (619)
Deferred 198 91 748 (336)
Income tax (expense) recovery $ (132) $ (119) $ 129 $ (955)