Goodwill and Intangible Assets 5-Year Amortization (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 8,327
Finite-Lived Intangible Assets, Amortization Expense, Year Two	15,964
Finite-Lived Intangible Assets, Amortization Expense, Year Three	15,820
Finite-Lived Intangible Assets, Amortization Expense, Year Four	15,517
Finite-Lived Intangible Assets, Amortization Expense, Year Five	15,378
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	58,904
Finite-Lived Intangible Assets, Net	$ 129,910	$ 135,528