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																12 Months Ended
	Dec. 31, 2016	[1]	Sep. 30, 2016	[1]	Jun. 30, 2016	[1]	Mar. 31, 2016	[1]	Dec. 31, 2015	[1]	Sep. 30, 2015	[1]	Jun. 30, 2015	[1]	Mar. 31, 2015	[1]	Dec. 31, 2016	Dec. 31, 2015	[2]	Dec. 31, 2014	[2]
Earnings Per Share [Abstract]
Net (loss) income attributable to CAI common stockholders used in the calculation of basic and diluted (loss) earnings per share	$ 620		$ (5,451)		$ 3,711		$ 7,117		$ (12,630)		$ 12,934		$ 12,824		$ 13,473		$ 5,997	$ 26,601		$ 59,887
Weighted-average shares used in the calculation of basic (loss) earnings per share																	19,318	20,773		20,732
Effect of dilutive securities: Stock options and restricted stock																	75	215		423
Weighted-average shares used in the calculation of diluted (loss) earnings per share																	19,393	20,988		21,155
Basic	$ 0.03		$ (0.29)		$ 0.20		$ 0.37		$ (0.63)		$ 0.62		$ 0.61		$ 0.64		$ 0.31	$ 1.28		$ 2.89
Diluted	$ 0.03		$ (0.29)		$ 0.20		$ 0.37		$ (0.63)		$ 0.61		$ 0.60		$ 0.63		$ 0.31	$ 1.27		$ 2.83

[1] Amounts for the quarters ended March 31, 2016 and 2015, June 30, 2016 and 2015, September 30, 2016 and 2015, and December 31, 2015 have been restated for immaterial corrections of identified errors relating to prepaid loan fees (see Note 2 (b) "Correction of Immaterial Errors")

[2] Amounts for the years ended December 31, 2015 and 2014 have been restated for immaterial corrections of identified errors relating to prepaid loan fees (see Note 2 (b) "Correction of Immaterial Errors").