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Income Taxes (Details 5) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Tax balances presented in accompanying consolidated balance sheets    
Current deferred income tax assets $ 79,856us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent $ 117,576us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Intangibles and other assets 23,540us-gaap_DeferredTaxAssetsNetNoncurrent 28,050us-gaap_DeferredTaxAssetsNetNoncurrent
Accrued liabilities (635)us-gaap_DeferredTaxLiabilitiesCurrent (1,331)us-gaap_DeferredTaxLiabilitiesCurrent
Deferred income tax liabilities (187,445)us-gaap_DeferredTaxLiabilitiesNoncurrent (198,353)us-gaap_DeferredTaxLiabilitiesNoncurrent
Net deferred tax liabilities $ (84,684)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (54,058)us-gaap_DeferredTaxAssetsLiabilitiesNet