Shares and Stockholders' Equity (Changes In Common stock (Number Of Shares)) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Changes In Common Stock (Number Of Shares) [Line Items]
Balance as of beginning-of-year			205,862,760
Balance as of end-of-period	198,327,250		198,327,250
Common stock as of End-of-Period
Basic basis	198,327,250	214,776,806	198,327,250	214,776,806
Diluted basis	200,724,744	217,390,897	200,724,744	217,390,897
Common Stock [Member]
Changes In Common Stock (Number Of Shares) [Line Items]
Balance as of beginning-of-year	200,775,731	217,294,051	205,862,760	218,090,114
Stock issued for exercise of warrants	36,610	97,076	258,633	119,942
Stock compensation/issued for benefit plans	41,006	38,642	934,081	675,608
Retirement/cancellation of shares	(2,526,097)	(2,652,963)	(8,728,224)	(4,108,858)
Balance as of end-of-period	198,327,250	214,776,806	198,327,250	214,776,806