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Subsequent events Ingram Barge Lawsuit (Details) (Subsequent Event [Member], USD $) In Thousands, unless otherwise specified	Aug. 09, 2012
Subsequent Event [Member]
Subsequent Event [Line Items]
loss contingency, estimated by Ingram	$ 4,600
Loss Contingency, Range of Possible Loss, Minimum	0
Loss Contingency, Range of Possible Loss, Maximum	$ 5,000

The estimated maximum amount of possible loss from the contingency.

The estimated minimum amount of possible loss from the contingency.