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		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Numerator [Abstract]
Net income attributable to CAI common stockholders used in the calculation of basic and diluted earnings per share	$ 12,889	$ 13,446	$ 26,431	$ 27,717
Denominator [Abstract]
Weighted average shares used in the calculation of basic earnings per share (in shares)	21,095	21,910	21,000	22,061
Effect of dilutive securities: Stock options and restricted stock (in shares)	303	445	346	445
Weighted average shares used in the calculation of diluted earnings per share (in shares)	21,398	22,355	21,346	22,506
Net income per share attributable to CAI common stockholders [Abstract]
Basic (in dollars per share)	$ 0.61	$ 0.61	$ 1.26	$ 1.26
Diluted (in dollars per share)	$ 0.60	$ 0.60	$ 1.24	$ 1.23