Employee Benefit Plans Amounts Recognized on Balance Sheet Table (Details) - Pension Plans, Defined Benefit [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	$ 740	$ 590
Defined Benefit Plan, Amounts Recognized in Balance Sheet
Current liabilities	(830)	(320)
Noncurrent liabilities	(11,290)	(10,240)
Net liability recognized at December 31	$ (11,380)	$ (9,970)