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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income attributable to CAI common stockholders	$ 20,006	$ 17,587	$ 56,272	$ 35,497
Weighted-average shares used in per share computation - basic	19,214	19,180	19,741	19,108
Effect of dilutive securities: Stock options and restricted stock	278	453	256	314
Weighted-average shares used in per share computation - diluted	19,492	19,633	19,997	19,422
Basic	$ 1.04	$ 0.92	$ 2.85	$ 1.86
Diluted	$ 1.03	$ 0.90	$ 2.81	$ 1.83