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Acquisitions Acquisitions (Pro Forma) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Business Acquisition [Line Items]    
Revenue of acquiree since acquisition date, actual $ 98,600 $ 180,600
Earnings or loss of acquiree since acquisition date, actual 5,300 10,900
2014 [Member]    
Business Acquisition [Line Items]    
Pro Forma Revenue 529,169 1,546,672
Pro Forma Net income (Loss) $ 14,698 $ 44,452