Retirement Plans and Profit Sharing Arrangements (Weighted Average Assumptions) (Details 5)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension Plans [Member]
Weighted average assumptions used to determine benefit obligations for pension plans
Discount rates (as a percent)	3.66%	3.66%
Rates of increase in compensation levels (as a percent)	4.39%	4.36%
Weighted average assumptions used to determine net periodic benefit cost for pension plans
Discount rates (as a percent)	3.67%	3.43%	4.06%
Rates of increase in compensation levels (as a percent)	4.43%	4.41%	4.38%
Expected long term rates of return on assets (as a percent)	6.98%	7.10%	7.58%
Other Postretirement Benefit Plan [Member]
Weighted average assumptions used to determine benefit obligations for pension plans
Discount rates (as a percent)	3.77%	3.90%
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Next year trend rate		5.75%
Ultimate trend rate		5.00%
Years to ultimate trend rate		3 years