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Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cash paid during the period for: |  |  |
Interest | $ 1,559 | $ 2,788 | $ 4,504
Income taxes | 6,999 | 3,202 | 4,664
Non-cash transactions: |  |  |
Barter revenue | 4,188 | 4,369 | 4,554
Barter expense | 3,894 | 4,138 | 4,541
Acquisition of property and equipment | $ 99 | $ 286 | $ 137

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