Employee Benefit Plans (Actuarial Assumptions Used for Accumulated Postretirement Benefit Obligation and Estimated Future Benefit Payments) (Details) (Other Postretirement Benefit Plans, Defined Benefit, USD $)	Dec. 31, 2012	Dec. 31, 2011
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans
Discount rate (as a percentage)	3.92%	4.79%
Expected Future Benefit Payments, Next Twelve Months	$ 500,000
Expected Future Benefit Payments, Year Two	500,000
Expected Future Benefit Payments, Year Three	500,000
Expected Future Benefit Payments, Year Four	500,000
Expected Future Benefit Payments, Year Five	500,000
Expected Future Benefit Payments, Five Fiscal Years Thereafter	$ 2,400,000