Pension and Other Post Retirement Benefit Plans Pension and Other Post Retirement Benefit Plans - Schedule of Net Periodic Benefit Costs (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Compensation and Retirement Disclosure [Abstract]
Service Cost	$ 161	$ 252
Interest Cost	2,990	3,208
Expected Return on Plan Assets	(4,216)	(4,313)
Amortization of Prior Service Cost	25	25
Amortization of Net Loss	2,207	1,129
Net Periodic Pension Cost	$ 1,167	$ 301