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Borrowings (Details) - Jun. 30, 2015 - USD ($)
$ in Millions
Total
Total
Line of Credit Facility [Line Items]    
Amount outstanding $ 29.9 $ 29.9
Remaining borrowing capacity 42.3 42.3
Letters of credit outstanding $ 2.8 $ 2.8
Minimum [Member]    
Line of Credit Facility [Line Items]    
Interest rate 3.50% 3.50%