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Share-Based Compensation and Benefit Plans Share-Based Compensation and Benefit Plans (Employee Share Purchase Plan Activity) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation [Abstract] |  |  |
Document Fiscal Year Focus | 2014 |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | 25,728 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans | 17,171 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans | 20,137 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Weighted Average Fair Value Of Shares Purchased Under Employee Share Purchase Plan | $ 71.19 cpt_WeightedAverageFairValueOfSharesPurchasedUnderEmployeeSharePurchasePlan | $ 62.59 cpt_WeightedAverageFairValueOfSharesPurchasedUnderEmployeeSharePurchasePlan | $ 67.80 cpt_WeightedAverageFairValueOfSharesPurchasedUnderEmployeeSharePurchasePlan
Employee Stock Ownership Plan (ESOP), Compensation Expense | $ 0.5 us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense | $ 0.2 us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense | $ 0.3 us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense

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- Definition Weighted average fair value of shares purchased during the period related to the employee share purchase plan. + References No definition available. + Details
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Balance Type: | na
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- Definition This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006. + References No definition available. + Details
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- Definition The amount of plan compensation cost recognized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
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- Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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