Summary Of Significant Accounting Policies (Net Income Per Common Share) (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Summary Of Significant Accounting Policies [Abstract]
Basic weighted average common shares outstanding	174,493	174,253	174,470	174,215
Net effect of dilutive stock options - based on treasury stock method	82	289	126	244
Diluted weighted average common shares outstanding	174,575	174,542	174,596	174,459