Pension Plans (Details 1) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Amounts recognized in the consolidated balance sheets
Accrued benefit liability—long term	$ (8,484)	$ (8,544)
Pension Benefits [Member]
Amounts recognized in the consolidated balance sheets
Accrued benefit liability—short term	(112)	(112)
Accrued benefit liability—long term	(8,413)	(8,470)
Net liability recognized at December 31	(8,525)	(8,582)
Net actuarial loss	(8,747)	(8,902)
Net prior service cost	(17)	(25)
Accumulated other comprehensive loss pre-tax at December 31	$ (8,764)	$ (8,927)