Shares and Stockholders' Equity (Changes In Common stock (Number Of Shares)) (Details) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 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	202,987,229
Common stock as of End-of-Period
Basic basis	202,987,229	218,695,476
Diluted basis	204,200,031	222,379,443
Common Stock [Member]
Changes In Common Stock (Number Of Shares) [Line Items]
Balance as of beginning-of-year	205,862,760	218,090,114
Stock issued for exercise of warrants	203,530	20,040
Stock compensation/issued for benefit plans	809,670	585,322
Retirement/cancellation of shares	(3,888,731)
Balance as of end-of-period	202,987,229	218,695,476