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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net (loss) income attributable to CAI common stockholders used in the calculation of basic and diluted (loss) earnings per share	$ (5,415)	$ 12,989	$ 5,508	$ 39,420
Weighted-average shares used in the calculation of basic (loss) earnings per share	19,130	20,920	19,427	20,973
Effect of dilutive securities: Stock options and restricted stock		139	71	263
Weighted-average shares used in the calculation of diluted (loss) earnings per share	19,130	21,059	19,498	21,236
Basic	$ (0.28)	$ 0.62	$ 0.28	$ 1.88
Diluted	$ (0.28)	$ 0.62	$ 0.28	$ 1.86