Goodwill and Intangible Assets 5-Year Amortization (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 4,004
Finite-Lived Intangible Assets, Amortization Expense, Year Two	16,013
Finite-Lived Intangible Assets, Amortization Expense, Year Three	15,867
Finite-Lived Intangible Assets, Amortization Expense, Year Four	15,578
Finite-Lived Intangible Assets, Amortization Expense, Year Five	15,426
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	58,879
Finite-Lived Intangible Assets, Net	$ 125,767	$ 135,528