Earnings Per Share (Reconciliation Of Basic And Diluted Net Income 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 from continuing operations	$ 32,470	$ 10,462
Net income (loss) from discontinued operations	1,063	(13,999)
Net income (loss) attributable to CAI common stockholders	$ 33,533	$ (3,537)
Weighted-average shares used in per share computation - basic	17,271	17,433
Effect of dilutive securities: Stock options and restricted stock	247	282
Weighted-average shares used in per share computation - diluted	17,518	17,715
Continuing operations	$ 1.88	$ 0.60
Discontinued operations	0.06	(0.80)
Total basic	1.94	(0.20)
Continuing operations	1.85	0.59
Discontinued operations	0.06	(0.79)
Total diluted	$ 1.91	$ (0.20)