Equity (Common Stock Changes In Number of Shares Issued, Held In Treasury and Outstanding) (Details) - shares		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Common Stock, Shares, Issued		79,137,758		79,137,758
Treasury Stock, Shares, Acquired		1,000,000
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		17,491,415	16,593,411	16,481,656	16,323,390
Treasury Stock, Shares, Acquired		1,074,413	344,237
Stock Based Compensation Shares	[1]	(64,654)	(74,216)
Common Stock Outstanding [Member]
Class of Stock [Line Items]
Common Stock, Shares, Issued		61,646,343	62,544,347	62,656,102	62,814,368
Treasury Stock, Shares, Acquired		(1,074,413)	(344,237)
Stock Based Compensation Shares	[1]	64,654	74,216

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