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Goodwill and Acquired Intangible Assets Future amortization of acquired intangible assets (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months $ 42,582
Finite-Lived Intangible Assets, Amortization Expense, Year Two 37,967
Finite-Lived Intangible Assets, Amortization Expense, Year Three 37,859
Finite-Lived Intangible Assets, Amortization Expense, Year Four 36,297
Finite-Lived Intangible Assets, Amortization Expense, Year Five 28,386
Total future amortization expense through the next five years $ 183,091