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

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-Name Accounting Standards Codification

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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.

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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

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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.

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PROPERTY AND EQUIPMENT (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PROPERTY AND EQUIPMENT
Total property and equipment	$ 355,481us-gaap_PropertyPlantAndEquipmentGross	$ 221,540us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization	(127,797)	(106,681)
Property and equipment, net	227,684us-gaap_PropertyPlantAndEquipmentNet	114,859us-gaap_PropertyPlantAndEquipmentNet
Depreciation and amortization expense	24,413	14,815	13,916
Cell development costs
PROPERTY AND EQUIPMENT
Total property and equipment	120,878	77,348
Land and improvements
PROPERTY AND EQUIPMENT
Total property and equipment	33,002	18,073
Buildings and improvements
PROPERTY AND EQUIPMENT
Total property and equipment	74,518	59,101
Railcars
PROPERTY AND EQUIPMENT
Total property and equipment	17,375	17,375
Vehicles and other equipment
PROPERTY AND EQUIPMENT
Total property and equipment	98,877	42,859
Construction in progress
PROPERTY AND EQUIPMENT
Total property and equipment	$ 10,831	$ 6,784