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Business Segment Information (Reconciliation Of Total Operating Profit Reported For Business Segments To Income From Operations In Consolidated Statements Of Operations) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |
Total operating profit from segments above | $ 401,673 us-gaap_GrossProfit | $ 301,853 us-gaap_GrossProfit | $ 256,350 us-gaap_GrossProfit
Noncontrolling interest reflected in segments | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 350 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 1,186 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Income from operations | 352,784 us-gaap_OperatingIncomeLoss | 248,409 us-gaap_OperatingIncomeLoss | 211,566 us-gaap_OperatingIncomeLoss
Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total operating profit from segments above | 401,673 us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 301,853 us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 256,350 us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Corporate overhead expenses | (48,889)us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | (53,733)us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | (45,759)us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Segment Reconciling Items [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Noncontrolling interest reflected in segments | $ 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | $ 289 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | $ 975 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember

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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Amount of Net Income (Loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686 + Details
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- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
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Period Type: | duration

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- Details
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- Details
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