Earnings Per Share (Reconciliation Of Basic And Diluted Net Income Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Numerator [Abstract]
Net income attributable to CAI common stockholders used in the calculation of basic and diluted earnings per share	$ 14,271	$ 16,067
Denominator [Abstract]
Weighted average shares used in the calculation of basic earnings per share (in shares)	22,213	22,085
Effect of dilutive securities (in shares)	445	583
Weighted average shares used in the calculation of diluted earnings per share (in shares)	22,658	22,668
Net income per share attributable to CAI common stockholders [Abstract]
Basic (in dollars per share)	$ 0.64	$ 0.73
Diluted (in dollars per share)	$ 0.63	$ 0.71