Earnings Per Share (Reconciliation Of Basic And Diluted Net Income Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net (loss) income attributable to CAI common stockholders	$ (3,537)	$ 16,367
Weighted-average shares used in per share computation - basic	17,433,000	18,555,000
Effect of dilutive securities: Stock options and restricted stock		315,000
Weighted-average shares used in per share computation - diluted	17,433,000	18,870,000
Basic	$ (0.20)	$ 0.88
Diluted	$ (0.20)	$ 0.87