Shares and Stockholders' Equity (Changes In Common stock (Number Of Shares)) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Changes In Common Stock (Number Of Shares) [Line Items]
Balance as of beginning-of-period			196,668,532
Balance as of end-of-period	193,254,948		193,254,948
Common stock as of End-of-Period
Basic basis	193,254,948	198,327,250	193,254,948	198,327,250
Diluted basis	195,331,049	200,724,744	195,331,049	200,724,744
Common Stock [Member]
Changes In Common Stock (Number Of Shares) [Line Items]
Balance as of beginning-of-period	193,247,103	200,775,731	196,668,532	205,862,760
Stock issued for exercise of warrants		36,610		258,633
Stock compensation/issued for benefit plans	7,845	41,006	396,340	934,081
Retirement/cancellation of shares		(2,526,097)	(3,809,924)	(8,728,224)
Balance as of end-of-period	193,254,948	198,327,250	193,254,948	198,327,250