XML 29 R37.htm IDEA: XBRL DOCUMENT v2.4.1.9
Summary of Significant Accounting Policies (Details Textual) (USD $)
 0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended
Dec. 03, 2014
Sep. 23, 2014
Nov. 21, 2013
Oct. 02, 2012
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]                
Four-for-three stock split           The stock split increased the Company’s issued and outstanding shares of common stock from 3,659,753 shares of Class A Common Stock and 597,504 shares of Class B Common Stock to 4,879,186 and 796,672 shares, respectively.    
Number of stock options outstanding having antidilutive effect           45,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 13,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 93,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Concentration Risk, Market Risk           43.00%us-gaap_ConcentrationRiskPercentage1 44.00%us-gaap_ConcentrationRiskPercentage1 44.00%us-gaap_ConcentrationRiskPercentage1
Depreciation expense           $ 6,648,000us-gaap_Depreciation $ 6,716,000us-gaap_Depreciation $ 6,805,000us-gaap_Depreciation
Interest expense related to the amortization of debt issuance costs           187,000us-gaap_AmortizationOfFinancingCosts 204,000us-gaap_AmortizationOfFinancingCosts 231,000us-gaap_AmortizationOfFinancingCosts
Write-off debt issuance costs           0us-gaap_WriteOffOfDeferredDebtIssuanceCost 55,000us-gaap_WriteOffOfDeferredDebtIssuanceCost 0us-gaap_WriteOffOfDeferredDebtIssuanceCost
Net book value of deferred costs           636,000us-gaap_OtherDeferredCostsNet 823,000us-gaap_OtherDeferredCostsNet  
Treasury Stock, Shares, Acquired           6,165us-gaap_TreasuryStockSharesAcquired 2,179us-gaap_TreasuryStockSharesAcquired 2,924us-gaap_TreasuryStockSharesAcquired
Treasury Stock Acquired, Average Cost Per Share           $ 41.15us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 43.98us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 27.30us-gaap_TreasuryStockAcquiredAverageCostPerShare
Advertising and promotion costs           3,056,000us-gaap_MarketingAndAdvertisingExpense 3,225,000us-gaap_MarketingAndAdvertisingExpense 3,182,000us-gaap_MarketingAndAdvertisingExpense
Special cash dividend declared on Classes A and B Common Stock $ 1.20us-gaap_CommonStockDividendsPerShareDeclared $ 0.20us-gaap_CommonStockDividendsPerShareDeclared $ 1.80us-gaap_CommonStockDividendsPerShareDeclared $ 1.24us-gaap_CommonStockDividendsPerShareDeclared $ 0.20us-gaap_CommonStockDividendsPerShareDeclared $ 1.80us-gaap_CommonStockDividendsPerShareDeclared $ 1.80us-gaap_CommonStockDividendsPerShareDeclared $ 1.24us-gaap_CommonStockDividendsPerShareDeclared
Dividend paid 8,200,000us-gaap_DividendsCommonStockStock 1,100,000us-gaap_DividendsCommonStockStock 10,300,000us-gaap_DividendsCommonStockStock 7,000,000us-gaap_DividendsCommonStockStock 1,100,000us-gaap_DividendsCommonStockStock      
Number Of Broadcast Licenses           99sga_NumberOfBroadcastLicenses    
Number Of Market Serving           25sga_NumberOfMarketServing    
Dividends Payable, Amount Per Share $ 0.20us-gaap_DividendsPayableAmountPerShare              
Common Class [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Stock Repurchase Program, Remaining Authorized Repurchase Amount           29,700,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		    
Minimum [Member] | Common Class [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Stock Repurchase Program, Authorized Amount           60,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		    
Maximum [Member] | Common Class [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Stock Repurchase Program, Authorized Amount           $ 75,800,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		    
Favorable Lease Agreements [Member] | Minimum [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Amortized over the lives of the leases term range           4 years    
Favorable Lease Agreements [Member] | Maximum [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Amortized over the lives of the leases term range           26 years