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Debt Debt (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Line of Credit Facility [Line Items]  
Debt Instrument, Unused Borrowing Capacity, Amount $ 62,164
Line of Credit Facility, Amount Outstanding 0
letters of credit outstanding under credit facility 15,860
Line of Credit Facility, Remaining Borrowing Capacity 46,304
Inventory Pledged as Collateral Under Line of Credit Facility 154,943
Number of Secured Letters of Credit Outstanding under Credit Facility 3
Letters of Credit Outstanding Under Letter of Credit Facilities 8,954
Restricted Cash for Secured Letter of Credit Agreements $ 9,148