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										12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	[1]	Jun. 30, 2019	[1]	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income from continuing operations	$ 9,541	$ 11,926		$ 8,487		$ 12,238	$ 16,084	$ 20,571	$ 19,503	$ 17,823	$ 42,192	$ 73,981	$ 62,565
Net (loss) income from discontinued operations											(20,010)	(509)	9,495
Net income attributable to CAI common stockholders											$ 22,182	$ 73,472	$ 72,060
Weighted-average shares used in per share computation - basic											17,731	19,562	19,253
Effect of dilutive securities: Stock options and restricted stock											280	260	354
Weighted-average shares used in per share computation - diluted											18,011	19,822	19,607
Continuing operations											$ 2.38	$ 3.78	$ 3.25
Discontinued operations											(1.13)	(0.02)	0.49
Total basic	$ 0.54	$ 0.69		$ 0.48		$ 0.66	$ 0.85	$ 1.07	$ 1.00	$ 0.87	1.25	3.76	3.74
Continuing operations											2.34	3.73	3.19
Discontinued operations											(1.11)	(0.02)	0.49
Total diluted	$ 0.54	$ 0.68		$ 0.47		$ 0.65	$ 0.83	$ 1.06	$ 0.99	$ 0.86	$ 1.23	$ 3.71	$ 3.68

[1] Subsequent to the filing of the Company's Quarterly Reports on Form 10-Q for the periods ended June 30, 2019 and September 30, 2019, the Company identified misstatements arising from the misclassification of certain leases. The Company has determined that the misstatements are immaterial to the prior quarters' consolidated financial statements. The impact of the adjustments is set out below (in thousands, except share amount):