Earnings Per Share (Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income	$ 46,492	$ 23,058
Weighted average common shares outstanding	67,932	69,253
Dilutive effect of stock-based awards	291	356
Shares used in computing diluted earnings per share	68,223	69,609
Basic earnings per share	$ 0.68	$ 0.33
Diluted earnings per share	$ 0.68	$ 0.33