Commitments and Contingencies (Details) (USD $)				1 Months Ended
	Sep. 29, 2012 Notes payable to bank	Sep. 29, 2012 Committed bank line	Sep. 29, 2012 Uncommitted bank lines	Jul. 31, 2012 Commodity Trading and Milling	Jun. 30, 2012 Commodity Trading and Milling vessel	Sep. 29, 2012 Debt guarantees of non-consolidated affiliates and third party party
Contingencies
Number of third parties to whom guarantees are outstanding						3
Maximum exposure for guarantees outstanding						$ 1,060,000
Letters of credit outstanding		70,862,000	3,395,000
Letters of credit outstanding related to supply agreements	30,469,000
Letters of credit for outstanding Industrial Development Revenue Bonds	18,397,000
Letters of credit related to insurance coverages	21,778,000
Number of dry bulk vessels to be built					4
Cost of dry bulk vessels to be built					83,000,000
Amount paid under the down payment				$ 8,300,000