Employee Benefit Plans (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Amounts recognized in the consolidated balance sheets
Accrued benefit liability—long term	$ (4,718)	$ (9,518)
Pension Benefits [Member]
Amounts recognized in the consolidated balance sheets
Accrued benefit liability—short term	(113)	(112)
Accrued benefit liability—long term	(4,647)	(9,411)
Net liability recognized at December 31	(4,760)	(9,523)
Net actuarial (loss) gain	(4,356)	(9,117)
Net prior service (cost) credit	(34)	(42)
Accumulated other comprehensive (loss) income pre-tax at December 31	(4,390)	(9,159)
Postretirement Benefits [Member]
Amounts recognized in the consolidated balance sheets
Accrued benefit liability—short term	(4)	(4)
Accrued benefit liability—long term	(71)	(107)
Net liability recognized at December 31	(75)	(111)
Net actuarial (loss) gain	735	806
Net prior service (cost) credit	31	2,089
Accumulated other comprehensive (loss) income pre-tax at December 31	$ 766	$ 2,895