Retirement Plans and Profit Sharing Arrangements (Weighted Average Assumptions) (Details 5)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Plans [Member]
Weighted average assumptions used to determine benefit obligations for pension plans
Discount rates (as a percent)	3.66%	3.44%
Rates of increase in compensation levels (as a percent)	4.36%	4.35%
Weighted average assumptions used to determine net periodic benefit cost for pension plans
Discount rates (as a percent)	3.43%	4.06%	3.45%
Rates of increase in compensation levels (as a percent)	4.41%	4.38%	4.36%
Expected long term rates of return on assets (as a percent)	7.10%	7.58%	7.62%
Other Postretirement Benefit Plan [Member]
Weighted average assumptions used to determine benefit obligations for pension plans
Discount rates (as a percent)	3.90%	3.60%
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Next year trend rate	5.75%	6.00%
Ultimate trend rate	5.00%	5.00%
Years to ultimate trend rate	3 years	4 years