Inventories (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Inventory, Net [Abstract]
Finished goods	$ 67,908	$ 74,246	$ 79,718
Growing crops	78,951	79,046	72,643
Raw materials, supplies and other	71,576	66,749	74,806
Inventory, net	$ 218,435	$ 220,041	$ 227,167