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Goodwill and Acquired Intangible Assets, Net (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Goodwill and Finite-lived Intangible Assets Rollforward [Roll Forward]    
Finite-Lived Intangible Assets, Net $ 96,236 $ 114,485
Finite-Lived Intangible Assets, Amortization Expense (15,320)  
Finite-lived intangible assets, other changes (2,929)  
Goodwill 685,991 704,197
Goodwill, Other Increase (Decrease) (18,892)  
Intangible Assets, Net (Including Goodwill) 782,227 $ 818,682
Total intangible assets amortization expense (15,320)  
Total intangible assets, other changes (21,821)  
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 4,900  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 19,200  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 18,300  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 17,300  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 12,700  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 6,500  
Finite-lived Intangible Assets Acquired 0  
Goodwill, Acquired During Period 686  
Total intangible assets acquired during period $ 686