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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]    
Chassis $ 7,665 $ 9,952
Raw materials 25,772 18,856
Work in process 9,915 7,961
Finished goods 10,820 8,276
Inventories $ 54,172 $ 45,045