Earnings Per Share (Schedule Of Earnings Per Share, Basic And Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator
Net income	$ 38,450	$ 15,495	$ 64,576	$ 32,612
Denominator
Weighted average common shares outstanding - basic	33,340,184	30,341,628	33,274,056	30,272,818
Dilutive effect of restricted stock units	121,510	227,220	195,013	234,127
Weighted average common shares outstanding - diluted	33,461,694	30,568,848	33,469,069	30,506,945
Earnings per share:
Basic	$ 1.15	$ 0.51	$ 1.94	$ 1.08
Diluted	$ 1.15	$ 0.51	$ 1.93	$ 1.07