Employee Benefit Plans (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Benefits [Member]
Components of net periodic benefit cost
Service cost	$ 198	$ 191	$ 316
Interest cost	882	934	1,015
Expected return on plan assets	(1,114)	(1,010)	(997)
Recognized actuarial loss (gain)	767	705	377
Amortization of prior service cost (gain)	8	8	7
Curtailment gain recognized	0	0	0
Total net periodic benefit cost	741	828	718
Postretirement Benefits [Member]
Components of net periodic benefit cost
Service cost	1	1	1
Interest cost	4	4	5
Expected return on plan assets	0	0	0
Recognized actuarial loss (gain)	(76)	(80)	(90)
Amortization of prior service cost (gain)	(391)	(391)	(391)
Curtailment gain recognized	(1,698)	0	0
Total net periodic benefit cost	$ (2,160)	$ (466)	$ (475)