Annual report pursuant to Section 13 and 15(d)

Business Acquisitions (Pro Forma Data) (Details)

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Business Acquisitions (Pro Forma Data) (Details) - FolioDynamix
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
Business Acquisition [Line Items]  
Revenues | $ $ 724,618
Net loss | $ $ (21,194)
Net loss per share:  
Basic (in dollars per share) | $ / shares $ (0.48)
Diluted (in dollars per share) | $ / shares $ (0.48)