Equity (Common Stock Changes In Number of Shares Issued, Held In Treasury and Outstanding) (Details) - shares		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Common Stock, Shares, Issued		79,137,758		79,137,758
Treasury Stock, Shares, Acquired		1,200,000
Common Stock Issuable [Member]
Class of Stock [Line Items]
Common Stock, Shares, Issued		79,137,758	79,137,758	79,137,758	79,137,758
Treasury Stock, Shares, Acquired		0	0
Stock Based Compensation Shares	[1]	0	0
Common Stock Held In Treasury [Member]
Class of Stock [Line Items]
Common Stock, Shares, Issued		15,072,348	12,699,199	13,933,232	10,364,797
Treasury Stock, Shares, Acquired		1,232,684	2,538,718
Stock Based Compensation Shares	[1]	(93,568)	(204,316)
Common Stock Outstanding [Member]
Class of Stock [Line Items]
Common Stock, Shares, Issued		64,065,410	66,438,559	65,204,526	68,772,961
Treasury Stock, Shares, Acquired		(1,232,684)	(2,538,718)
Stock Based Compensation Shares	[1]	93,568	204,316

[1] Represents net shares issued from treasury pursuant to the Company's equity-based compensation programs.