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Fair Value Measurements (Narrative) (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Non-recurring fair value measurements [Abstract] |  |
Fair Value Adjustments, Nonrecurring | $ 0 | $ 0

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- Definition Non-recurring fair value measurements [Abstract] + References No definition available. + Details
Name: | cpt_NonrecurringfairvaluemeasurementsAbstract
Namespace Prefix: | cpt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a nonrecurring basis by the entity. + References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant