Earnings Per Share (Reconciliation Of Basic And Diluted Net Income Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income from continuing operations	$ 12,958	$ 20,571	$ 37,524	$ 57,897
Net loss from discontinued operations	(19,912)	(565)	(20,983)	(1,625)
Net (loss) income attributable to CAI common stockholders	$ (6,954)	$ 20,006	$ 16,541	$ 56,272
Weighted-average shares used in per share computation - basic	17,330,000	19,214,000	17,850,000	19,741,000
Effect of dilutive securities: Stock options and restricted stock	195,000	278,000	272,000	256,000
Weighted-average shares used in per share computation - diluted	17,525,000	19,492,000	18,122,000	19,997,000
Continuing operations	$ 0.75	$ 1.07	$ 2.10	$ 2.93
Discontinued operations	(1.15)	(0.03)	(1.17)	(0.08)
Total basic	(0.40)	1.04	0.93	2.85
Continuing operations	0.74	1.06	2.07	2.90
Discontinued operations	(1.14)	(0.03)	(1.16)	(0.09)
Total diluted	$ (0.40)	$ 1.03	$ 0.91	$ 2.81