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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income (loss) attributable to CAI common stockholders used in the calculation of basic and diluted earnings per share	$ 17,587	$ (5,451)	$ 35,497	$ 5,377
Weighted-average shares used in the calculation of basic earnings per share	19,180	19,130	19,108	19,427
Effect of dilutive securities: Stock options and restricted stock	453		314	71
Weighted-average shares used in the calculation of diluted earnings per share	19,633	19,130	19,422	19,498
Basic	$ 0.92	$ (0.28)	$ 1.86	$ 0.28
Diluted	$ 0.90	$ (0.28)	$ 1.83	$ 0.28