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Share-Based Compensation and Benefit Plans Share-Based Compensation and Benefit Plans (Deferred Compensation Plan Shares) Table (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Share Based Compensation Awards (Deferred Compensation Plan Awards) Table [Abstract]
Non-Qualified deferred compensation share awards	$ 47,180us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests	$ 0us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests
Change in classification of deferred compensation plan	7,702cpt_Changeinclassificationofdeferredcompensationplan	37,958cpt_Changeinclassificationofdeferredcompensationplan
Change in redemption value of non-qualified share awards	17,921cpt_Changeinredemptionvalueofeligiblenonqualifiedshareawards	9,575cpt_Changeinredemptionvalueofeligiblenonqualifiedshareawards
Diversification of share awards	(4,669)cpt_Diversificationofshareawards	(353)cpt_Diversificationofshareawards
Non-Qualified deferred compensation share awards	$ 68,134us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests	$ 47,180us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests

X

- Definition

The value of share awards reclassed from additional paid in capital into temporary equity following amendment of the Non-Qualified Deferred Compensation plan permitting diversification of awards into other equity securities subject to a six month holding period and at the holders’ option.

+ References

No definition available.

+ Details

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X

- Definition

Change in redemption value of eligible non-qualified share awards classified within temporary equity during the period.

+ References

No definition available.

+ Details

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- Definition

The value of share awards diversified into other equity securities following the amendment of the Non-Qualified Deferred Compensation plan.

+ References

No definition available.

+ Details

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- Details

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X

- Definition

Carrying amount, attributable to parent and noncontrolling interests, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.27(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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