General and Summary of Significant Accounting Policies Future Estimated Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 17,103
Finite-Lived Intangible Assets, Amortization Expense, Year Two	16,126
Finite-Lived Intangible Assets, Amortization Expense, Year Three	15,825
Finite-Lived Intangible Assets, Amortization Expense, Year Four	15,681
Finite-Lived Intangible Assets, Amortization Expense, Year Five	15,532
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	44,919
Finite-Lived Intangible Assets, Net	$ 125,186	$ 135,528