Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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- Definition

The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
-Paragraph 28
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Amount before accumulated depreciation, depletion and amortization of physical assets 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, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Section 50
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 13
-Subparagraph a
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PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended
PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
PROPERTY AND EQUIPMENT
Total property and equipment	$ 399,211		$ 393,145
Accumulated depreciation and amortization	(173,451)		(166,908)
Property and equipment, net	225,760		226,237
Depreciation and amortization of plant and equipment	6,633	$ 5,904
Cell development costs
PROPERTY AND EQUIPMENT
Total property and equipment	128,927		128,821
Land and improvements
PROPERTY AND EQUIPMENT
Total property and equipment	34,343		34,285
Buildings and improvements
PROPERTY AND EQUIPMENT
Total property and equipment	78,108		78,081
Railcars
PROPERTY AND EQUIPMENT
Total property and equipment	17,299		17,299
Vehicles and other equipment
PROPERTY AND EQUIPMENT
Total property and equipment	111,962		110,267
Construction in progress
PROPERTY AND EQUIPMENT
Total property and equipment	$ 28,572		$ 24,392