Credit Facility Incremental Commitment

No definition available.

Name:	cas_CreditFacilityIncrementalCommitment
Namespace Prefix:	cas_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Ratio of EBITDA to fixed charges required to be maintained when excess availability under the Revolving Credit Facility falls below a certain level.

+ References

No definition available.

+ Details

Name:	cas_EarningsBeforeInterestTaxesDepreciationAndAmortizationToFixedChargesRatio
Namespace Prefix:	cas_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

The lower bound of excess revolver availability as defined in Revolving Credit Facility Agreement, under which amount the Company must retain a ratio of EBITDA to fixed charged of 1.1 to 1.0.

+ References

No definition available.

+ Details

Name:	cas_ExcessAvailabilityLowerBoundSpringingCovenant
Namespace Prefix:	cas_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of excess availability to calculated borrowing base, under which percentage certain springing covenants occur.

+ References

No definition available.

+ Details

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

- Definition

The upper bound of excess revolver availability under which amount the lender has the right to take full dominion of the Company's cash collections and apply them to outstanding loans under the Revolving Credit Agreement.

+ References

No definition available.

+ Details

Name:	cas_ExcessAvailabilityUpperBoundSpringingCovenant
Namespace Prefix:	cas_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line of Credit Facility, Borrowing Capacity excluding minimum excess availability, springing covenant

+ References

No definition available.

+ Details

Name:	cas_LineofCreditFacilityBorrowingCapacityexcludingminimumexcessavailabilityspringingcovenant
Namespace Prefix:	cas_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line of Credit, Terms, Provision to Increase the Aggregate Amount of Commitments Under Certain Conditions, Amount

+ References

No definition available.

+ Details

Name:	cas_LineOfCreditTermsProvisionToIncreaseAggregateAmountOfCommitmentsUnderCertainConditionsAmount
Namespace Prefix:	cas_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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

- Definition

The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Line-of-Credit Arrangement

-URI http://asc.fasb.org/extlink&oid=6517033

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 45

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1314-112600

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 45

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1336-112600

+ Details

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

Debt Revolving Credit Agreement (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Revolving Credit Facility [Member]	Jan. 21, 2014 Revolving Credit Facility [Member]	Dec. 15, 2011 Revolving Credit Facility [Member]	Mar. 31, 2014 Minimum Revolving Credit Facility [Member]	Mar. 31, 2014 Maximum Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility Incremental Commitment				$ 25,000
Weighted average interest rate for borrowings			3.12%
Revolving Credit Facility	0	0
Ratio of EBITDA to fixed charges, springing covenant	0.14					1.1
Line of Credit Facility, Borrowing Capacity excluding minimum excess availability, springing covenant			99,683
Percentage of excess availability to calculated borrowing base						10.00%	12.50%
Excess Availability, upper bound, Springing Covenant							15,625
Excess Availability, lower bound, springing covenant						12,500
Excess availability, revolving credit facility			115,308
Line of Credit Facility, Maximum Borrowing Capacity				125,000	100,000
Line of Credit, Terms, Provision to Increase the Aggregate Amount of Commitments Under Certain Conditions, Amount			$ 25,000