Pension (Net Pension Cost) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Pension [Abstract]
Service cost - benefits earned during the period	$ 103	$ 88
Interest cost on projected benefit obligation	1,287	1,362
Expected return on plan assets	(1,645)	(1,675)
Amortization of unrecognized net loss	730	540
Net periodic pension cost	$ 475	$ 315