Employee Benefit Plans Amounts Recognized on Balance Sheet Table (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	$ 590	$ 790
Defined Benefit Plan, Amounts Recognized in Balance Sheet
Current liabilities	(320)	(320)
Noncurrent liabilities	(10,240)	(11,590)
Net liability recognized at December 31	(9,970)	(11,120)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	0	0
Defined Benefit Plan, Amounts Recognized in Balance Sheet
Current liabilities	(50)	(70)
Noncurrent liabilities	(360)	(590)
Net liability recognized at December 31	$ (410)	$ (660)