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Fair Value Disclosures (Narrative) (Details) (USD $)	1 Months Ended	6 Months Ended
	Feb. 28, 2011	Jun. 30, 2011
Fair Value Disclosures
Participant withdrawals from deferred compensation plan investments		$ 10,900,000
Proceeds from sale of available-for-sale investment		4,510,000
Gross realized gain on available-for-sale investment	$ 4,300,000

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- Definition

Fair Value Disclosures.

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- Definition

Participant withdrawals from deferred compensation plan investments

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Namespace Prefix:	cpt
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Balance Type:	debit
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X

- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 21
-Subparagraph a

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- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 16
-Subparagraph a

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 18

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 15

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 16
-Subparagraph b

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