Employee Benefit Plans (Details 4)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Discount rate for net periodic benefit cost	4.70%	5.70%
Discount rate for benefit obligations	4.17%	4.70%
Rate of increase in future compensation levels	3.50%	3.50%
Expected rate of return on plan assets	7.75%	7.75%