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Change of Control (Details) (Icahn, USD $)	1 Months Ended
	May 31, 2012	Jun. 30, 2012 day	May 18, 2012	May 07, 2012
Icahn
Change of Control
Price per share				$ 30
Number of non-transferable contingent cash payments right for each Share (in shares)				1
Number of shares of common stock tendered in the Offer	48,112,317
Ownership percentage held by controlling stockholder		82.00%	70.00%	55.00%
Marketing period for third parties to acquire entity (in days)		60
Number of non-transferable contingent cash payments right for each restricted stock awards vested (in shares)		1

X

- Definition

Represents the entity's closing stock price.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Represents the percentage of ownership interest held by the majority shareholder.

+ References

No definition available.

+ Details

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Namespace Prefix:	cvi_
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Balance Type:	na
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X

- Definition

Represents the marketing period in days for third parties to acquire entity.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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Period Type:	instant

X

- Definition

Represents the number of non-transferable contingent cash payments right for each restricted stock awards vested.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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X

- Definition

Represents the number of non-transferable contingent cash payments right for each Share.

+ References

No definition available.

+ Details

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Namespace Prefix:	cvi_
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Balance Type:	na
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X

- Definition

Represents the number of shares of common stock which are validly tendered pursuant to the offer.

+ References

No definition available.

+ Details

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Namespace Prefix:	cvi_
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- Details

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