Pension - Periodic Benefit Cost (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Components of net periodic benefit cost:
Interest cost	$ 5	$ 21	$ 48	$ 64
Service cost	13	9	30	27
Expected return on plan assets	2	(24)	(53)	(71)
Amortization of prior service costs	3	2	8	7
Amortization of actuarial loss	29	34	106	102
Net periodic benefit cost	$ 52	$ 43	$ 139	$ 128