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Income Taxes (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Provision for income taxes differs from income taxes                      
Income from continuing operations before taxes $ (10,457) $ (22,434) $ 69,873 $ 5,583 $ (43,867) $ (30,784) $ 84,149 $ 37,569 $ 42,565 $ 47,067 $ 43,952
Provision for income taxes:                      
Tax at Federal statutory rate                 14,898 16,473 15,383
Impact of Partnership income or loss not subject to federal income taxes                 697 1,631 1,239
State taxes net of federal benefit                 2,801 3,493 3,087
Permanent differences                 28 54 (44)
Change in valuation allowance                 (14) 672 (3,928)
Change in unrecognized tax benefit                 (1,669) 189 667
Other                 (165) 211 (772)
Income tax expense                 $ 16,576 $ 22,723 $ 15,632