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Debt Credit Facility Interest Rates (Details)
3 Months Ended
Mar. 31, 2013
Unused Letters of Credit
 
Line of Credit Facility [Line Items]  
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum 2.00%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum 3.00%
Unused Revolver
 
Line of Credit Facility [Line Items]  
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum 0.375%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum 0.50%
Minimum
 
Line of Credit Facility [Line Items]  
Debt Instrument Interest Rate in Addition to Base Rate Borrowings 1.00%
Debt Instrument Interest Rate in Addition to Libor 2.00%
Maximum
 
Line of Credit Facility [Line Items]  
Debt Instrument Interest Rate in Addition to Base Rate Borrowings 2.00%
Debt Instrument Interest Rate in Addition to Libor 3.00%