Employee Benefit Plans (Details 6)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Pension Benefits [Member]
Weighted-average assumptions
Discount rate used for Net Periodic Pension Cost	4.50%	5.50%
Discount Rate used for Disclosure	4.00%	4.50%
Expected return on plan assets	8.00%	8.00%
Rate of compensation increase	3.00%	3.00%
Postretirement Benefits [Member]
Weighted-average assumptions
Discount rate used for Net Periodic Pension Cost	4.50%	5.50%
Discount Rate used for Disclosure	4.00%	4.50%