Cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land or leased assets).

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Gross amount of long-lived physical assets excluding assets held under lease agreements used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	9 Months Ended
PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016
Property and equipment
Property and equipment, gross		$ 815,002	$ 739,386
Less accumulated depreciation and impairment		(535,456)	(490,519)
Total property and equipment, net		279,546	248,867
Impairment of property and equipment	$ 60,026
Capital lease obligations		0	0
Land
Property and equipment
Property and equipment, gross		7,106	8,593
Building and leasehold improvements
Property and equipment
Property and equipment, gross		83,328	83,352
Vehicles and equipment
Property and equipment
Property and equipment, gross		38,547	24,114
Machinery and equipment
Property and equipment
Property and equipment, gross		564,741	534,303
Computer equipment and software
Property and equipment
Property and equipment, gross		11,438	11,102
Office furniture and equipment
Property and equipment
Property and equipment, gross		3,709	4,275
Disposal wells
Property and equipment
Property and equipment, gross		67,778	67,566
Helicopters
Property and equipment
Property and equipment, gross		497	497
Construction in progress
Property and equipment
Property and equipment, gross		$ 37,858	$ 5,584