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Guarantor Financial Information Guarantor Financial Information Narrative (Details)	6 Months Ended
	Jun. 30, 2016
Guarantor Subsidiary, Ownership Percentage	100.00%

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- Definition

Guarantor Subsidiary, Ownership Percentage

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No definition available.

+ Details

Name:	cas_GuarantorSubsidiaryOwnershipPercentage
Namespace Prefix:	cas_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration