Equity (Common Stock Changes In Number of Shares Issued, Held In Treasury and Outstanding) (Details) - shares		3 Months Ended
		Mar. 31, 2019	Mar. 31, 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		300,000
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
Stock Based Compensation Shares	[1]	0	0
Common Stock Held In Treasury [Member]
Class of Stock [Line Items]
Common Stock, Shares, Issued		16,593,411	14,624,985	16,323,390	14,685,663
Treasury Stock, Shares, Acquired		344,237
Stock Based Compensation Shares	[1]	(74,216)	(60,678)
Common Stock Outstanding [Member]
Class of Stock [Line Items]
Common Stock, Shares, Issued		62,544,347	64,512,773	62,814,368	64,452,095
Treasury Stock, Shares, Acquired		(344,237)
Stock Based Compensation Shares	[1]	74,216	60,678

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