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Acquisitions Business Acquisition, Pro Forma Information (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended
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