Earnings Per Share (Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net income	$ 23,058	$ 36,086
Weighted average common shares outstanding	69,253	70,274
Dilutive effect of stock-based awards	356	298
Shares used in computing diluted earnings per share	69,609	70,572
Basic earnings per share	$ 0.33	$ 0.51
Diluted earnings per share	$ 0.33	$ 0.51
Number of antidilutive options that were excluded from computation of earnings per share	0	0