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Long-Term Obligations and Short-Term Note Payable Long Term Obligations (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Jul. 09, 2013
Nov. 07, 2012
Debt Instrument [Line Items]      
Long-term Obligations $ 164,800,000    
Letters of Credit 12,000,000    
Available borrowing capacity 223,200,000    
Revolving Credit Facility [Member] | Fifth Third Bank [Member] | Line of Credit [Member]
      
Debt Instrument [Line Items]      
Maximum Borrowing Capacity   400,000,000 175,000,000
Maximum Borrowing Capacity under Accordion Feature   450,000,000  
Weighted Average Interest Rate 2.50%    
Unused Capacity, Commitment Fee Percentage 0.40%    
Intercompany Note Payable $ 102,000,000