Equity (Common Stock Changes In Number of Shares Issued, Held In Treasury and Outstanding) (Details) - shares		3 Months Ended
		Sep. 30, 2016	Sep. 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		14,931,485	13,388,357	13,933,232	10,364,797
Treasury Stock, Shares, Acquired		1,356,892	3,573,797
Stock Based Compensation Shares	[1]	(358,639)	(550,237)
Common Stock Outstanding [Member]
Class of Stock [Line Items]
Common Stock, Shares, Issued		64,206,273	65,749,401	65,204,526	68,772,961
Treasury Stock, Shares, Acquired		(1,356,892)	(3,573,797)
Stock Based Compensation Shares	[1]	358,639	550,237

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