Pension and Other Postretirement Benefit Plans Schedule of Expected Benefit Payments (Details) (USD $)	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	$ 1,600,000
Defined Benefit Plan, Expected Future Benefit Payments in Year One	949,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	1,045,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	1,140,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	1,160,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	1,279,000
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	$ 8,116,000