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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Chassis	$ 4,700mlr_InventoryChassisNetOfReserves	$ 7,665mlr_InventoryChassisNetOfReserves
Raw materials	24,291	25,772
Work in process	10,477	9,915
Finished goods	16,992	10,820
Inventories	$ 56,460us-gaap_InventoryNet	$ 54,172us-gaap_InventoryNet

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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