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Acquisitions Business Acquisition, Pro Forma Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014
Acquired Indefinite-lived Intangible Assets [Line Items] |  |
Business Acquisition, Pro Forma Revenue | $ 1,029,314 | $ 951,357
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax | 35,095 | 24,526
Business Acquisition, Pro Forma Net Income (Loss) | $ 61,124 | $ 25,986
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Basic | $ 0.67 | $ 0.45
Business Acquisition, Pro Forma Earnings Per Share, Basic | 1.16 | 0.47
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted | 0.66 | 0.44
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ 1.15 | $ 0.46
Weighted Average Basic Shares Outstanding, Pro Forma | 52,543 | 55,034
Pro Forma Weighted Average Shares Outstanding, Diluted | 53,273 | 55,915

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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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