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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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