Earnings Per Share (Schedule Of Earnings Per Share, Basic And Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator
Net income	$ 49,764	$ 27,024	$ 114,340	$ 59,636
Denominator
Weighted average common shares outstanding - basic	33,350,633	30,587,487	33,299,768	30,378,860
Dilutive effect of restricted stock units	380,619	318,748	256,882	262,334
Weighted average common shares outstanding - diluted	33,731,252	30,906,235	33,556,650	30,641,194
Earnings per share:
Basic	$ 1.49	$ 0.88	$ 3.43	$ 1.96
Diluted	$ 1.48	$ 0.87	$ 3.41	$ 1.95