Retirement Plans Projected Benefit Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Benefit Obligation, Beginning	$ 28,399	$ 30,047
Service cost	0	44	$ 84
Interest cost	1,216	1,230	1,171
Defined Benefit Plan, Actuarial Gain (Loss)	(464)	(1,372)
Benefit payments	(1,539)	(1,550)
Benefit Obligation, Ending	$ 27,612	$ 28,399	$ 30,047