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Basis of Presentation Changes in accounting presentation (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
New Accounting Pronouncements or Change in Accounting Principle        
Other comprehensive income $ 0 $ 0 $ 1,797 $ 0
Accumulated Other Comprehensive Loss
       
New Accounting Pronouncements or Change in Accounting Principle        
Other comprehensive income     $ 1,797