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RELATED PARTY TRANSACTIONS (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
RELATED PARTY TRANSACTIONS [Abstract]  
Inventory purchase payment from joint venture $ 1.2belfb_InventoryPurchasePaymentFromJointVenture
Joint venture liability $ 0.8belfb_JointVentureLiability