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Income Taxes (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income taxes      
Federal and state interest expense and penalties   $ 100,000  
Interest income related to 2005 and 2006 amended returns to carry back 2007 losses     1,300,000
Unrecognized tax benefits which, if recognized, would impact the company's effective tax rate 10,400,000    
Interest expense recognized on uncertain tax positions 500,000    
Penalties recognized on uncertain tax positions 200,000    
Accrued interest 500,000    
Accrued penalties 200,000    
Decrease in unrecognized tax benefits that is reasonably possible, maximum 1,500,000    
Reconciliation of the unrecognized tax benefits      
Balance beginning of year 17,712,000 245,000  
Increase based on prior year tax positions 4,755,000   245,000
Decrease based on prior year tax positions (30,000)    
Increases and decrease in current year tax positions 14,705,000 17,467,000  
Reductions related to expirations of statute of limitations (193,000)    
Balance end of year 36,949,000 17,712,000 245,000
State | Kansas
      
Income taxes      
Tax credit carryforwards 9,800,000    
State | Oklahoma
      
Income taxes      
Tax credit carryforwards $ 3,800,000