Equity (Common Stock Changes In Number of Shares Issued, Held In Treasury and Outstanding) (Details) - shares		3 Months Ended
		Jun. 30, 2016	Jun. 30, 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		1,400,000
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		15,068,009	12,716,098	13,933,232	10,364,797
Treasury Stock, Shares, Acquired		1,352,211	2,791,360
Stock Based Compensation Shares	[1]	(217,434)	(440,059)
Common Stock Outstanding [Member]
Class of Stock [Line Items]
Common Stock, Shares, Issued		64,069,749	66,421,660	65,204,526	68,772,961
Treasury Stock, Shares, Acquired		(1,352,211)	(2,791,360)
Stock Based Compensation Shares	[1]	217,434	440,059

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