General and Summary of Significant Accounting Policies Future Estimated Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 15,996
Finite-Lived Intangible Assets, Amortization Expense, Year Two	15,582
Finite-Lived Intangible Assets, Amortization Expense, Year Three	15,444
Finite-Lived Intangible Assets, Amortization Expense, Year Four	15,361
Finite-Lived Intangible Assets, Amortization Expense, Year Five	15,242
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	57,903
Finite-Lived Intangible Assets, Net	$ 135,528	$ 22,383