Employee Benefit Plans (Target Allocation And Actual Weighted-Average Asset Allocation Of Plan Assets) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation	[1]	35.00%	34.00%
Target plan asset allocation		30.00%	30.00%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation	[1]	62.00%	62.00%
Target plan asset allocation		67.00%	67.00%
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation	[1]	3.00%	4.00%
Target plan asset allocation		3.00%	3.00%
Pro Forma [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation		36.00%	35.00%
Pro Forma [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation		64.00%	65.00%
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer		$ 20,482	$ 24,056

[1] Cash contributions of $24.1 million and $20.5 million were made to the pension plans during 2014 and 2015, respectively. Amounts contributed in 2014 and 2015 in excess of benefit payments made were to be invested in debt and equity securities over a twelve-month period, with the amounts that remained uninvested as of December 31, 2014 and 2015 scheduled for investment in accordance with the target. Excluding these uninvested cash amounts, the actual allocation percentages at December 31, 2014 would have been 35% equity securities and 65% debt securities and at December 31, 2015, would have been 36% equity securities and 64% debt securities. In 2016, we will invest these uninvested cash amounts to bring the total asset allocation in line with the target allocation.