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Acquisition (Pro Forma) (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Business Acquisition [Line Items]    
Revenues $ 529,294 $ 507,029
Net income (loss) $ (7,001) $ (39,044)
Basic (usd per share) $ (0.23) $ (1.30)
Diluted (usd per share) $ (0.23) $ (1.30)