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SUBSEQUENT EVENT (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Alltel Sale	Jan. 21, 2013 Subsequent event Forecast Alltel Sale AT&T
SUBSEQUENT EVENT
Consideration for sale of operations in all-cash transaction													$ 780,000,000
Revenues	184,385,000	188,798,000	185,293,000	182,890,000	182,943,000	194,346,000	193,753,000	188,154,000	741,366,000	759,196,000	619,145,000	464,400,000
Percentage of consolidated revenues												63.00%
Operating income	$ 28,598,000	$ 29,630,000	$ 23,074,000	$ 18,159,000	$ 10,939,000	$ 27,646,000	$ 6,277,000	$ 10,389,000	$ 99,461,000	$ 55,251,000	$ 38,284,000	$ 41,400,000
Percentage of consolidated operating income												42.00%

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- Definition

Represents the percentage of operating income (loss) to consolidated operating income (loss) of the entity.

+ References

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- Definition

Represents the percentage of revenue to consolidated revenues of the entity.

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

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- Definition

Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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- Definition

The value of all consideration given or received by the Entity in the significant acquisition or disposal.

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