Earnings Per Share (Reconciliation Of Basic And Diluted Net Income Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income from continuing operations	$ 12,328	$ 19,503	$ 24,566	$ 37,361
Net loss from discontinued operations	(5,200)	(354)	(1,071)	(1,095)
Net income attributable to CAI common stockholders	$ 7,128	$ 19,149	$ 23,495	$ 36,266
Weighted-average shares used in per share computation - basic	17,648,000	19,613,000	18,098,000	20,013,000
Effect of dilutive securities: Stock options and restricted stock	278,000	230,000	303,000	245,000
Weighted-average shares used in per share computation - diluted	17,926,000	19,843,000	18,401,000	20,258,000
Continuing operations	$ 0.70	$ 1.00	$ 1.36	$ 1.86
Discontinued operations	(0.30)	(0.02)	(0.06)	(0.05)
Total basic	0.40	0.98	1.30	1.81
Continuing operations	0.69	0.99	1.34	1.84
Discontinued operations	(0.29)	(0.02)	(0.06)	(0.05)
Total diluted	$ 0.40	$ 0.97	$ 1.28	$ 1.79