Borrowings (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Revolving credit facilities
Borrowings
Maximum borrowing capacity	$ 60
Amount of borrowing subject to the bank's dominion	3.1
Amount outstanding	28.8
Line of Credit Facility, Current borrowing base	55.8
Term loans
Borrowings
Term Loan, face amount	$ 7.5