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Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash paid during the period for: |  |  |
Interest | $ 874 us-gaap_InterestPaid | $ 1,103 us-gaap_InterestPaid | $ 1,559 us-gaap_InterestPaid
Income taxes | 7,319 us-gaap_IncomeTaxesPaid | 7,134 us-gaap_IncomeTaxesPaid | 6,999 us-gaap_IncomeTaxesPaid
Non-cash transactions: |  |  |
Barter revenue | 3,844 us-gaap_AdvertisingBarterTransactionsAdvertisingBarterRevenue | 3,855 us-gaap_AdvertisingBarterTransactionsAdvertisingBarterRevenue | 4,188 us-gaap_AdvertisingBarterTransactionsAdvertisingBarterRevenue
Barter expense | 3,636 us-gaap_AdvertisingBarterTransactionsAdvertisingBarterCosts | 3,844 us-gaap_AdvertisingBarterTransactionsAdvertisingBarterCosts | 3,894 us-gaap_AdvertisingBarterTransactionsAdvertisingBarterCosts
Acquisition of property and equipment | $ 91 us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1 | $ 104 us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1 | $ 99 us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1

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- Definition Total expense recognized from advertising barter transactions for each income statement presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406959&loc=d3e49171-111630 + Details
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- Definition Total revenue recognized from advertising barter transactions for each income statement presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406959&loc=d3e49171-111630 + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The amount of cash paid for interest during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The amount of fixed assets that an Entity acquires in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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