INTANGIBLE ASSETS, Goodwill (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Carrying Amount of Goodwill [Abstract]
Gross goodwill	$ 598,748,000us-gaap_GoodwillGross	$ 598,748,000us-gaap_GoodwillGross
Accumulated impairment losses	(334,058,000)	(334,058,000)
Goodwill, net of accumulated impairment losses	264,690,000us-gaap_Goodwill	264,690,000us-gaap_Goodwill
Cable
Carrying Amount of Goodwill [Abstract]
Gross goodwill	234,290,000	234,290,000
Accumulated impairment losses	0	0
Goodwill, net of accumulated impairment losses	234,290,000	234,290,000
Lightpath
Carrying Amount of Goodwill [Abstract]
Gross goodwill	21,487,000	21,487,000
Accumulated impairment losses	0	0
Goodwill, net of accumulated impairment losses	21,487,000	21,487,000
Other
Carrying Amount of Goodwill [Abstract]
Gross goodwill	342,971,000	342,971,000
Accumulated impairment losses	(334,058,000)	(334,058,000)
Goodwill, net of accumulated impairment losses	$ 8,913,000	$ 8,913,000

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a,h)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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