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Per Share Data (Calculation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Earnings Per Share [Abstract] |  |
Number of common share equivalent securities excluded from the diluted earnings per share calculation | 1,500,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 2,100,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Net income attributable to common shareholders | $ 115,599 us-gaap_NetIncomeLoss | $ 40,036 us-gaap_NetIncomeLoss
Amount allocated to participating securities | (1,052)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic | (352)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic
Net income attributable to common shareholders – basic | 114,547 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 39,684 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Earnings per common share – basic | $ 1.29 us-gaap_EarningsPerShareBasic | $ 0.45 us-gaap_EarningsPerShareBasic
Weighted average number of common shares outstanding – basic | 88,987,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 87,651,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Income allocated to common units from continuing operations | 766 cpt_Incomeallocatedtocommonunits | 310 cpt_Incomeallocatedtocommonunits
Net income attributable to common shareholders – diluted | $ 115,313 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 39,994 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Earnings per common share – diluted | $ 1.27 us-gaap_EarningsPerShareDiluted | $ 0.45 us-gaap_EarningsPerShareDiluted
Common share options and share awards granted | 391,000 cpt_CommonShareOptionsAndShareAwardsGranted | 360,000 cpt_CommonShareOptionsAndShareAwardsGranted
Common units | 1,086,000 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock | 813,000 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
Weighted average number of common shares outstanding – diluted | 90,464,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 88,824,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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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 The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + 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 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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