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v2.4.1.9

Net Income Per Share (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Common shares |  |  |  |  |  |  |  |  | 21,739,300 us-gaap_WeightedAverageNumberOfSharesIssuedBasic | 23,180,633 us-gaap_WeightedAverageNumberOfSharesIssuedBasic | 24,850,830 us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Vested restricted stock units |  |  |  |  |  |  |  |  | 517,804 us-gaap_WeightedAverageNumberOfSharesRestrictedStock | 670,156 us-gaap_WeightedAverageNumberOfSharesRestrictedStock | 558,825 us-gaap_WeightedAverageNumberOfSharesRestrictedStock
Basic number of weighted average shares outstanding | 21,109,349 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 21,888,591 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 22,653,393 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 23,463,380 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 23,438,153 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 23,672,635 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 23,974,099 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 24,330,027 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 22,257,104 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 23,850,789 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 25,409,655 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of stock options |  |  |  |  |  |  |  |  | 3,293 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 31,180 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 48,005 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Dilutive effect of restricted stock and restricted stock units |  |  |  |  |  |  |  |  | 71,004 cacc_DilutiveSecuritiesRestrictedStockAndRestrictedStockUnits | 127,624 cacc_DilutiveSecuritiesRestrictedStockAndRestrictedStockUnits | 141,296 cacc_DilutiveSecuritiesRestrictedStockAndRestrictedStockUnits
Weighted average shares outstanding: Diluted | 21,171,235 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 21,895,222 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 22,658,891 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 23,528,466 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 23,575,786 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 23,708,043 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 24,017,273 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 24,426,127 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 22,331,401 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 24,009,593 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 25,598,956 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Restricted stock outstanding excluded from calculation of diluted net income per share |  |  |  |  |  |  |  |  | 0 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 0 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 0 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 28A -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1500-109256 + Details
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