Employee Benefit Plans (Employe Savings and Stock Ownership Plan - 401k Plan) (Details)	12 Months Ended
Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans
Defined Contribution Plan, Maximum Annual Contribution Per Employee (as a percentage)	20.00%
Defined Contribution Plan, Employer Matching Contribution (as a percentage)	25.00%
Maximum Percentage of Employee's Salary Eligible for Defined Contribution Plan (as a percentage)	7.00%

Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration