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Income Taxes (Details 2) (USD $) | 12 Months Ended
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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 |

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