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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]    
Chassis $ 8,048 $ 4,700
Raw materials 28,328 24,291
Work in process 10,850 10,477
Finished goods 19,006 16,992
Inventories $ 66,232 $ 56,460