Shares and Stockholders' Equity (Changes In Common stock (Number Of Shares)) (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 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	193,247,103		193,247,103
Common stock as of End-of-Period
Basic basis	193,247,103	200,775,731	193,247,103	200,775,731
Diluted basis	193,962,833	202,245,662	193,962,833	202,245,662
Common Stock [Member]
Changes In Common Stock (Number Of Shares) [Line Items]
Balance as of beginning-of-period	193,208,244	202,987,229	196,668,532	205,862,760
Stock issued for exercise of warrants		18,493		222,023
Stock compensation/issued for benefit plans	38,859	83,405	388,495	893,075
Retirement/cancellation of shares		(2,313,396)	(3,809,924)	(6,202,127)
Balance as of end-of-period	193,247,103	200,775,731	193,247,103	200,775,731