Pension and Other Post Retirement Benefit Plans Pension and Other Post Retirement Benefit Plans - Schedule of Expected Future Benefit Payments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
2013	$ 3,984
2014	4,110
2015	4,236
2016	4,219
2017	4,201
After 2017	21,414
Total	$ 42,164