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Goodwill and Acquired Intangible Assets, Net (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Goodwill and Finite-lived Intangible Assets Rollforward [Roll Forward]    
Finite-Lived Intangible Assets, Net $ 104,374 $ 114,485
Finite-Lived Intangible Assets, Amortization Expense (10,303)  
Finite-lived intangible assets, other changes 192  
Goodwill 706,367 704,197
Goodwill, Other Increase (Decrease) 1,484  
Intangible Assets, Net (Including Goodwill) 810,741 $ 818,682
Total intangible assets amortization expense (10,303)  
Total intangible assets, other changes 1,676  
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 10,200  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 19,700  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 18,900  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 17,800  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 13,100  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 6,700  
Finite-lived Intangible Assets Acquired 0  
Goodwill, Acquired During Period 686  
Total intangible assets acquired during period $ 686