Pension (Net Pension Cost) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Pension [Abstract]
Defined Contribution Plan, Employer Discretionary Contribution Amount			$ 1,500,000
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	0
Service cost - benefits earned during the period	132,000	103,000
Interest cost on projected benefit obligation	1,122,000	1,287,000
Expected return on plan assets	(1,609,000)	(1,645,000)
Amortization of unrecognized net loss	767,000	730,000
Net periodic pension cost	$ 412,000	$ 475,000