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Income Taxes Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Summary Of Tax Components Of Common And Preferred Dividends Declared And Distributions [Table Text Block] | A summary of the income tax characterization of our distributions paid per common share for the years ended December 31, 2020, 2019 and 2018 is set forth in the following table:
|  | Year Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Common Share Distributions |  |  |  |  |  |
Ordinary income |  | $ | 3.22 |  |  | $ | 2.53 |  |  | $ | 2.99 |
Long-term capital gain |  | 0.04 |  |  | 0.46 |  |  | 0.09 |
Return of capital |  | 0.06 |  |  | — |  |  | — |
Unrecaptured Sec. 1250 gain |  | — |  |  | 0.21 |  |  | — |
Total |  | $ | 3.32 |  |  | $ | 3.20 |  |  | $ | 3.08 |

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- Definition A schedule that shows summary of estimated percentage of tax component of common and preferred dividends declared and distributions during the period. + References No definition available. + Details
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Namespace Prefix: | cpt_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration