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Note 12 - Income Taxes (Details) - Deferred Taxes (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Taxes [Abstract]    
Allowance for doubtful accounts $ 3,607us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts $ 2,784us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Basis difference of intangible assets 7,623us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 6,220us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Net operating loss carryforwards 2,334us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 489us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Share-based compensation 10,462us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 10,930us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Foreign currency translation 7,805us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses 4,221us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses
Tax credits 683us-gaap_DeferredTaxAssetsTaxCreditCarryforwards  
Other deferred tax assets 816us-gaap_DeferredTaxAssetsOther 476us-gaap_DeferredTaxAssetsOther
Other deferred tax assets 1,087us-gaap_DeferredIncomeTaxesAndOtherAssetsNoncurrent 991us-gaap_DeferredIncomeTaxesAndOtherAssetsNoncurrent
Total deferred tax assets 4,423us-gaap_DeferredTaxAssetsGrossCurrent 3,260us-gaap_DeferredTaxAssetsGrossCurrent
Total deferred tax assets 29,994us-gaap_DeferredTaxAssetsGrossNoncurrent 22,851us-gaap_DeferredTaxAssetsGrossNoncurrent
Basis difference of property and equipment (227)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (1,194)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Cash to accrual adjustments (166)us-gaap_DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals (2,426)us-gaap_DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals
Cash to accrual adjustments   (166)exam_DeferredTaxLiabilitiesCashToAccrualAdjustmentsNonCurrent
Other deferred tax liabilities (481)exam_DeferredTaxLiabilitiesOtherCurrent (401)exam_DeferredTaxLiabilitiesOtherCurrent
Other deferred tax liabilities (85)exam_DeferredTaxLiabilitiesOtherNoncurrent  
Total deferred tax liabilities (647)us-gaap_DeferredTaxLiabilitiesGrossCurrent (2,827)us-gaap_DeferredTaxLiabilitiesGrossCurrent
Total deferred tax liabilities (312)us-gaap_DeferredTaxLiabilitiesGrossNoncurrent (1,360)us-gaap_DeferredTaxLiabilitiesGrossNoncurrent
Net deferred tax assets 3,776us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 433us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Net deferred tax assets $ 29,682us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent $ 21,491us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent