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Note 13 - Income Taxes (Details) - Deferred Tax Assets and Liabilities (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Deferred revenue and cancellation reserves $ 31,539us-gaap_DeferredTaxAssetsDeferredIncome $ 22,356us-gaap_DeferredTaxAssetsDeferredIncome
Allowances and accruals, including state tax carryforward amounts 28,553us-gaap_DeferredTaxAssetsTaxDeferredExpense 17,561us-gaap_DeferredTaxAssetsTaxDeferredExpense
Interest on derivatives 678us-gaap_DeferredTaxAssetsDerivativeInstruments 1,113us-gaap_DeferredTaxAssetsDerivativeInstruments
Credits and other   1,937us-gaap_DeferredTaxAssetsOther
Goodwill 2,668us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 10,331us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Capital loss carryforward 10,711us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 10,893us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Valuation allowance (8,663)us-gaap_DeferredTaxAssetsValuationAllowance (11,087)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets 65,486us-gaap_DeferredTaxAssetsGross 53,104us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Inventories (19,356)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts (6,722)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts
Goodwill (21,320)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets  
Property and equipment, principally due to differences in depreciation (67,271)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (32,563)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Prepaid expenses and other (2,936)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses (2,015)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Total deferred tax liabilities (110,883)us-gaap_DeferredIncomeTaxLiabilities (41,300)us-gaap_DeferredIncomeTaxLiabilities
Total (45,397)us-gaap_DeferredTaxLiabilities  
Total   $ 11,804us-gaap_DeferredTaxAssetsLiabilitiesNet