Equity (Common Stock Changes In Number of Shares Issued, Held In Treasury and Outstanding) (Details) - shares		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Common Stock, Shares, Issued		79,137,758			79,137,758
Treasury Stock, Shares, Acquired				(1,000,000.0)
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	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		16,379,267	15,465,272	15,465,272	16,323,390	14,685,663
Treasury Stock, Shares, Acquired		(344,237)	(991,477)
Stock Based Compensation Shares	[1]	(288,360)	(211,868)
Common Stock Outstanding [Member]
Class of Stock [Line Items]
Common Stock, Shares, Issued		62,758,491	63,672,486	63,672,486	62,814,368	64,452,095
Treasury Stock, Shares, Acquired		(344,237)	(991,477)
Stock Based Compensation Shares	[1]	(288,360)	(211,868)

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