General and Summary of Significant Accounting Policies Future Estimated Amortization Expense (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 2,719
Finite-Lived Intangible Assets, Amortization Expense, Year Two	2,560
Finite-Lived Intangible Assets, Amortization Expense, Year Three	2,147
Finite-Lived Intangible Assets, Amortization Expense, Year Four	2,008
Finite-Lived Intangible Assets, Amortization Expense, Year Five	1,925
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	$ 11,024