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Commitments and Contingencies Letters of Credit (Details) (Letter of Credit [Member], Revolving Credit Facility [Member], Fifth Third Bank [Member], USD $)
Mar. 31, 2014
Letter of Credit [Member] | Revolving Credit Facility [Member] | Fifth Third Bank [Member]
 
Debt Instrument [Line Items]  
Line of Credit Facility, Amount Outstanding $ 0
Letters of Credit Outstanding $ 13,500,000