Defined Benefit Pension Plans Amounts reported in the consolidated balance sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Defined benefit plan disclosure [Line Items]
Current liability	$ (83)	$ (499)
Noncurrent liability	(13,241)	(11,513)
Funded status of the plans	$ (13,324)	$ (12,012)