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A recognized intangible asset shall be amortized over its estimated useful life to the reporting entity unless that life is determined to be indefinite. If an intangible asset has a finite useful life, but the precise length of that life is not known, that intangible asset shall be amortized over the best estimate of its useful life.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) falsefalseAmortization during the period6false0pre_GoodwillAndIntangibleAssetsprefalsedebitinstantThe aggregate amount of goodwill and intangible assets, net of accumulated amortization and impairment charges, if any, at...falsefalsefalsefalsefalsefalsefalsefalsetruefalseperiodendlabel1truefalsefalse634248000634248falsefalsefalsefalsefalse2truefalsefalse702802000702802falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe aggregate amount of goodwill and intangible assets, net of accumulated amortization and impairment charges, if any, at the measurement date.No authoritative reference available.falsefalseEnding balance7true0pre_IntangibleAssetsLineItemsprefalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseIntangible Assets [Line Items]8false0pre_IntangibleAssetsGrossExcludingGoodwillprefalsedebitinstantSum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, prior to accumulated...falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse287546000287546falsefalsefalsefalsefalse2truefalsefalse287546000287546falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, prior to accumulated amortization and impairment charges.No authoritative reference available.truefalseGross intangible assets excluding goodwill9true0us-gaap_GoodwillLineItemsus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringLine items represent financial concepts included in a table. 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available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse3179900031799falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of amortization expense expected to be recognized during the second twelve-month period following the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(3) falsefalseFuture Amortization Expense Year Two14false0us-gaap_FutureAmortizationExpenseYearThreeus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse1947900019479falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of amortization expense expected to be recognized during the third twelve-month period following the balance sheet date.Reference 1: 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available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse1390000013900falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of amortization expense expected to be recognized during the fifth twelve-month period following the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(3) falsefalseFuture Amortization Expense Year Five17false0us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse125976000125976falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe aggregate estimated amortization expense for each of the five succeeding fiscal years for intangible assets subject to amortization.Reference 1: 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A recognized intangible asset shall be amortized over its estimated useful life to the reporting entity unless that life is determined to be indefinite. 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A recognized intangible asset shall be amortized over its estimated useful life to the reporting entity unless that life is determined to be indefinite. 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The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) falsefalseDefinite-lived intangible assets, gross40false0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortizationus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse108831000108831falsefalsefalsefalsefalse2truefalsefalse4027700040277falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe accumulated amount of amortization of a major finite-lived intangible asset class. 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