PROPERTY AND EQUIPMENT (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
PROPERTY AND EQUIPMENT
Property and equipment, gross	$ 180,396,000us-gaap_PropertyPlantAndEquipmentGross	$ 173,474,000us-gaap_PropertyPlantAndEquipmentGross
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	(109,817,000)	(101,356,000)
Property and equipment, net	70,579,000us-gaap_PropertyPlantAndEquipmentNet	72,118,000us-gaap_PropertyPlantAndEquipmentNet
Land
PROPERTY AND EQUIPMENT
Property and equipment, gross	1,247,000	1,247,000
Building and building and leasehold improvements
PROPERTY AND EQUIPMENT
Property and equipment, gross	23,428,000	22,127,000
Building and building and leasehold improvements \| Minimum
PROPERTY AND EQUIPMENT
Estimated Useful Life	3 years
Building and building and leasehold improvements \| Maximum
PROPERTY AND EQUIPMENT
Estimated Useful Life	30 years
Furniture and fixtures
PROPERTY AND EQUIPMENT
Property and equipment, gross	8,796,000	7,712,000
Estimated Useful Life	5 years
Computer equipment and purchased software
PROPERTY AND EQUIPMENT
Property and equipment, gross	131,229,000	110,449,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	(4,000,000)	(5,700,000)
Assets acquired under capital leases	4,400,000	8,200,000
Computer equipment and purchased software \| Minimum
PROPERTY AND EQUIPMENT
Estimated Useful Life	2 years
Computer equipment and purchased software \| Maximum
PROPERTY AND EQUIPMENT
Estimated Useful Life	5 years
Transportation equipment
PROPERTY AND EQUIPMENT
Property and equipment, gross	5,027,000	7,522,000
Transportation equipment \| Minimum
PROPERTY AND EQUIPMENT
Estimated Useful Life	3 years
Transportation equipment \| Maximum
PROPERTY AND EQUIPMENT
Estimated Useful Life	5 years
Operations equipment
PROPERTY AND EQUIPMENT
Property and equipment, gross	6,267,000	6,122,000
Operations equipment \| Minimum
PROPERTY AND EQUIPMENT
Estimated Useful Life	3 years
Operations equipment \| Maximum
PROPERTY AND EQUIPMENT
Estimated Useful Life	5 years
Construction in progress
PROPERTY AND EQUIPMENT
Property and equipment, gross	$ 4,402,000	$ 18,295,000

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

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.14)

-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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- Definition

The total gross amount less the charge for the use of the 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

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

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- Definition

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

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-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

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.13)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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 360

-SubTopic 10

-Section 50

-Paragraph 1

-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

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.13)

-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 13

-Subparagraph a

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 8

-Article 7

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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