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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, 2015
Mar. 31, 2014
Numerator [Abstract]    
Net income attributable to CAI common stockholders used in the calculation of basic and diluted earnings per share $ 13,542us-gaap_NetIncomeLoss $ 14,271us-gaap_NetIncomeLoss
Denominator [Abstract]    
Weighted average shares used in the calculation of basic earnings per share (in shares) 20,903us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 22,213us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities: Stock options and restricted stock (in shares) 392us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 445us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average shares used in the calculation of diluted earnings per share (in shares) 21,295us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 22,658us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income per share attributable to CAI common stockholders [Abstract]    
Basic (in dollars per share) $ 0.65us-gaap_EarningsPerShareBasic $ 0.64us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) $ 0.64us-gaap_EarningsPerShareDiluted $ 0.63us-gaap_EarningsPerShareDiluted