Retirement Plans Projected Benefit Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Benefit Obligation, Beginning	$ 30,047	$ 25,145
Service cost	44	84	$ 230
Interest cost	1,230	1,171	1,159
Defined Benefit Plan, Actuarial Gain (Loss)	(1,372)	5,014
Benefit payments	(1,550)	(1,367)
Benefit Obligation, Ending	$ 28,399	$ 30,047	$ 25,145