Employee Benefit Plans Schedule of Pension Assumptions (Details)	12 Months Ended
	Dec. 31, 2012
Pension Plan
Assumptions for benefit obligation:
Discount rate	3.70%
Rate of compensation increase	0.00%	[1]
Assumptions for net periodic benefit cost:
Discount rate	4.50%
Expected return on plan assets	5.00%
Rate of compensation increase	0.00%	[1]
PBP
Assumptions for benefit obligation:
Discount rate	3.50%
Rate of compensation increase	0.00%	[1]
Ultimate medical trend rate (pre65/post65)	4.50%
Year ultimate rate reached (pre65/post65)	2028
Assumptions for net periodic benefit cost:
Discount rate	4.55%
Rate of compensation increase	0.00%	[1]
PBP | Benefit Obligation
Assumptions for benefit obligation:
Initial medical trend rate (pre65/post65)	7.30%
PBP | Net Periodic Benefit | Pre65
Assumptions for benefit obligation:
Initial medical trend rate (pre65/post65)	7.40%
PBP | Net Periodic Benefit | Post65
Assumptions for benefit obligation:
Initial medical trend rate (pre65/post65)	9.30%

[1] No assumption was made with regard to the rate of expected compensation increase as there are no new active service participants in the plan.