Employee Benefit Plans Net Periodic Pension (Benefit) Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Interest cost on projected benefit obligation	$ 701	$ 680	$ 757
Expected return on plan assets	(1,036)	(1,144)	(1,193)
Amortization of net actuarial loss	165	56	0
Net periodic pension benefit	$ (170)	$ (408)	$ (436)