PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
PROPERTY AND EQUIPMENT
Property and equipment, gross	$ 197,789	$ 180,396
Accumulated depreciation and amortization	(120,074)	(109,817)
Property and equipment, net	77,715	70,579
Depreciation and software and leasehold amortization	37,800	36,000	$ 31,000
Land
PROPERTY AND EQUIPMENT
Property and equipment, gross	1,247	1,247
Building and building and leasehold improvements
PROPERTY AND EQUIPMENT
Property and equipment, gross	24,040	23,428
Furniture and fixtures
PROPERTY AND EQUIPMENT
Property and equipment, gross	10,002	8,796
Computer equipment and purchased software
PROPERTY AND EQUIPMENT
Property and equipment, gross	141,871	131,229
Assets acquired under capital leases	14,900	8,400
Accumulated amortization	7,300	4,000
Transportation equipment
PROPERTY AND EQUIPMENT
Property and equipment, gross	5,027	5,027
Operations equipment
PROPERTY AND EQUIPMENT
Property and equipment, gross	9,979	6,267
Construction in progress
PROPERTY AND EQUIPMENT
Property and equipment, gross	$ 5,623	$ 4,402

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
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-Name Accounting Standards Codification
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 14
-Article 5

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Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

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The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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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
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-Topic 210
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-Publisher SEC
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