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Income Taxes (Schedule of Components of Income From Continuing Operations Before Tax) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income from continuing operations before income taxes | $ 240,214 | $ 192,719 | $ 159,280
Domestic [Member] |  |  |
Income from continuing operations before income taxes | 233,400 | 184,500 | 160,400
Foreign [Member] |  |  |
Income from continuing operations before income taxes | $ 6,800 | $ 8,200 | $ (1,100)

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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
Name: | us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration