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Income Taxes (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2011
shareholder
Dec. 31, 2010
Income taxes    
Number of largest shareholders 2  
Annual limitation for the use of general business federal tax credit carryforwards $ 24,000,000  
Tax benefits related to the deductibility of stock-based compensation 2,300,000  
Federal and state interest expense and penalties 100,000  
Interest income related to 2005 and 2006 amended returns to carryback 2007 losses   1,300,000
Unrecognized tax benefits which, if recognized, would impact the Company's effective tax rate 17,500,000  
Reconciliation of the unrecognized tax benefits    
Balance beginning of year 245,000  
Increase based on prior year tax positions   245,000
Increases and decrease in current year tax positions 17,467,000  
Balance end of year 17,712,000 245,000
Kansas state
    
Income taxes    
Tax credit carryforwards $ 27,200,000