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Income Taxes (Details 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at January 1 $ 56,813us-gaap_UnrecognizedTaxBenefits $ 52,271us-gaap_UnrecognizedTaxBenefits $ 62,247us-gaap_UnrecognizedTaxBenefits
Additions based on tax positions related to the current year 6,896us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 7,606us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 3,980us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Reductions due to lapse of applicable statutes of limitation (3,227)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (3,064)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (13,956)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Gross balance at December 31 60,482us-gaap_UnrecognizedTaxBenefits 56,813us-gaap_UnrecognizedTaxBenefits 52,271us-gaap_UnrecognizedTaxBenefits
Interest and penalties 5,125us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 5,756us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 5,319us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Balance at December 31 $ 65,607r_UnrecognizedTaxBenefitsIncludingIncomeTaxPenaltiesAndInterestAccrued $ 62,569r_UnrecognizedTaxBenefitsIncludingIncomeTaxPenaltiesAndInterestAccrued $ 57,590r_UnrecognizedTaxBenefitsIncludingIncomeTaxPenaltiesAndInterestAccrued