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, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income attributable to CAI common stockholders used in the calculation of basic and diluted earnings per share	$ 12,989	$ 16,395	$ 39,420	$ 44,112
Weighted-average shares used in the calculation of basic earnings per share	20,920	20,936	20,973	21,193
Effect of dilutive securities: Stock options and restricted stock	139	393	263	429
Weighted-average shares used in the calculation of diluted earnings per share	21,059	21,329	21,236	21,622
Basic	$ 0.62	$ 0.78	$ 1.88	$ 2.08
Diluted	$ 0.62	$ 0.77	$ 1.86	$ 2.04