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Commitments and Contingencies - Income Tax Examination (Details) (USD $)
3 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jul. 31, 2006
Indiana Sales Tax [Member]
Dec. 31, 2010
Indiana Sales Tax [Member]
Jun. 30, 2011
Indiana Sales Tax [Member]
Jun. 30, 2011
Indiana Income Tax [Member]
Income Tax Examination [Line Items]          
Income Taxes Paid   $ 800,000 $ 3,300,000    
Income Tax Examination, Year(s) under Examination         2005 to 2007
Income Tax Examination, Proposed Adjustment Excluding Interest and Penalties         7,300,000
Income Tax Examination, Proposed Penalties and Interest Expense         2,300,000
Proposed adjustment including interest and penalties       3,100,000  
Income Tax Examination, Penalties from Examination       246,000  
Income Tax Examination, Tax Credit Granted in Settlement $ 123,000