Components of Net Periodic Pension Costs (Schedule of Net Periodic Pension Cost) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Components of Net Periodic Pension Cost [Abstract]
Interest cost	$ 139	$ 147	$ 417	$ 441
Net amortization and deferral	(21)	(51)	(63)	(151)
Net periodic pension cost	$ 118	$ 96	$ 354	$ 290