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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Inventory, Net [Abstract]      
Finished goods $ 64,956 $ 69,450 $ 69,658
Growing crops 79,119 74,985 77,498
Raw materials, supplies and other 68,319 66,129 68,956
Inventory, net $ 212,394 $ 210,564 $ 216,112