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Goodwill and Identifiable Intangible Assets - Acquired Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 90,279 $ 94,971
Accumulated Amortization (23,093) (19,235)
Net Carrying Amount 67,186 75,736
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 73,032 73,875
Accumulated Amortization (10,240) (6,800)
Net Carrying Amount 62,792 67,075
Developed technologies    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 6,458 6,683
Accumulated Amortization (5,818) (5,411)
Net Carrying Amount 640 1,272
Trade name and other    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 10,789 14,413
Accumulated Amortization (7,035) (7,024)
Net Carrying Amount $ 3,754 $ 7,389