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Acquisitions Business Acquisition, Pro Forma Information (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2015
USD ($)
$ / shares
shares
Acquired Indefinite-lived Intangible Assets [Line Items]  
Business Acquisition, Pro Forma Revenue | $ $ 494,708
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax | $ 13,955
Business Acquisition, Pro Forma Net Income (Loss) | $ $ 40,067
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Basic $ 0.27
Business Acquisition, Pro Forma Earnings Per Share, Basic 0.77
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted 0.26
Business Acquisition, Pro Forma Earnings Per Share, Diluted $ 0.76
Weighted Average Basic Shares Outstanding, Pro Forma | shares 52,314
Pro Forma Weighted Average Shares Outstanding, Diluted | shares 53,046