Goodwill and Intangible Assets 5-Year Amortization (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 17,048
Finite-Lived Intangible Assets, Amortization Expense, Year Two	16,099
Finite-Lived Intangible Assets, Amortization Expense, Year Three	15,897
Finite-Lived Intangible Assets, Amortization Expense, Year Four	15,773
Finite-Lived Intangible Assets, Amortization Expense, Year Five	15,624
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	41,343
Finite-Lived Intangible Assets, Net	$ 121,784	$ 125,186