Pension, Profit Sharing & Other Post-Retirement Benefits - Assumptions (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate for projected benefit obligation	2.00%	3.00%	4.00%
Discount rate for pension costs	3.00%	4.00%	4.50%
Expected long-term average return on plan assets	5.81%	6.72%	6.72%
Rate of compensation increase	2.00%	2.00%	2.00%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate for projected benefit obligation	4.40%	4.70%	5.40%
Discount rate for pension costs	4.70%	5.40%	6.00%
Expected long-term average return on plan assets	5.92%	7.75%	7.75%
Rate of compensation increase	3.00%	3.00%	3.00%