Equity (Activities Of Non-Qualified Savings Plan During Each Of Three Years) (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity, Class of Treasury Stock [Line Items]
Aggregate amount	$ 104,567	$ 2,896	$ 47,631
Non Qualified Deferred Compensation Plans [Member]
Equity, Class of Treasury Stock [Line Items]
Purchases, Number of shares	244	120	99
Aggregate amount	$ 6	$ 4	$ 4