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Acquisitions Business Acquisition, Pro Forma Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Write off of Deferred Debt Issuance Cost | $ 0 | $ 0 | $ (3,751) | $ 0
Business Acquisition, Pro Forma Revenue |  |  | 1,601,437 | 1,456,081
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax |  |  | 59,986 | 45,238
Business Acquisition, Pro Forma Net Income (Loss) |  |  | $ 86,049 | $ 47,980
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Basic |  |  | $ 1.14 | $ 0.83
Business Acquisition, Pro Forma Earnings Per Share, Basic |  |  | 1.64 | 0.88
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted |  |  | 1.13 | 0.81
Business Acquisition, Pro Forma Earnings Per Share, Diluted |  |  | $ 1.62 | $ 0.86
Weighted Average Basic Shares Outstanding, Pro Forma |  |  | 52,508 | 54,750
Pro Forma Weighted Average Shares Outstanding, Diluted |  |  | 53,213 | 55,629

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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