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Income Taxes Income Taxes Discussion (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
percent
Sep. 30, 2011
percent
Income Taxes [Abstract]        
Effective Income Tax Rate, Continuing Operations     27.90% 26.70%
Income tax expense/(benefit) $ 5,124 $ 4,542 $ 14,215 $ 8,559
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate     35.00% 35.00%