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Income Taxes (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income taxes      
Unrecognized tax benefits which, if recognized, would impact the company's effective tax rate $ 19,100,000 $ 10,400,000  
Interest on income recognized on uncertain tax positions 2,200,000 500,000  
Penalties recognized on uncertain tax positions 0 200,000  
Accrued interest 2,600,000 500,000  
Accrued penalties 0 200,000  
Federal and state interest expense and penalties     100,000
Interest and penalties accrued     0
Reconciliation of the unrecognized tax benefits      
Balance beginning of year 36,900,000 17,700,000 200,000
Increase based on prior year tax positions 0 4,800,000 0
Decrease based on prior year tax positions (6,400,000) (100,000) 0
Increases in current year tax positions 14,700,000 14,700,000 17,500,000
Settlements 0 0 0
Reductions related to expirations of statute of limitations 0 (200,000) 0
Balance end of year 45,200,000 36,900,000 17,700,000
State | Kansas
      
Income taxes      
Tax credit carryforwards 5,300,000    
State | Oklahoma
      
Income taxes      
Tax credit carryforwards $ 8,900,000