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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Amount of expense charged against earnings to allocate the cost of tangible and intangible assets over their remaining economic lives, classified as other.

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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.

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PROPERTY AND EQUIPMENT, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property and equipment, net
Property and equipment, gross	$ 369,086	$ 283,252
Less: accumulated depreciation and amortization	(138,810)	(109,909)
Property and equipment, net	230,276	173,343
Total depreciation and amortization expense	37,000	30,200	$ 27,000
Land
Property and equipment, net
Property and equipment, gross	47,373	46,596
Leasehold improvements
Property and equipment, net
Property and equipment, gross	3,109	2,687
Furniture and fixtures
Property and equipment, net
Property and equipment, gross	6,461	3,635
Office and computer equipment
Property and equipment, net
Property and equipment, gross	14,506	11,701
Computer software
Property and equipment, net
Property and equipment, gross	3,650	3,274
Equipment
Property and equipment, net
Property and equipment, gross	148,434	114,230
Building
Property and equipment, net
Property and equipment, gross	107,374	69,547
Vehicles
Property and equipment, net
Property and equipment, gross	$ 38,179	$ 31,582