Goodwill and Other Intangible Assets Intangible Assets Text (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 0	$ 0
Amortization of Intangible Assets	$ 5,601	$ 6,282	$ 6,711
Finite-Lived Intangible Assets, Remaining Amortization Period	6 years 8 months 6 days