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Fair Value Measurements (Narrative) (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
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

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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant