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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator
Net income	$ 9,470	$ 13,342	$ 33,100	$ 34,467
Less: Undistributed earnings allocated to participating securities	(52)	(241)	(289)	(785)
Net income allocable to common stockholders	$ 9,418	$ 13,101	$ 32,811	$ 33,682
Denominator
Weighted average common shares outstanding - basic	25,445,552	20,673,521	23,038,390	20,643,682
Dilutive effect of restricted stock units	280,585	148,545	236,930	88,248
Weighted average common shares outstanding - diluted	25,726,137	20,822,066	23,275,320	20,731,930
Earnings per share:
Basic	$ 0.37	$ 0.63	$ 1.42	$ 1.63
Diluted	$ 0.37	$ 0.63	$ 1.41	$ 1.62