| **Incentive Plans and Stock-Based Compensation (Directors' Restricted Stock Compensation) (Details) (Directors' Restricted Stock [Member], USD $)In Thousands, except Share data, unless otherwise specified** | 12 Months Ended                                                                                                              |
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| Directors' Restricted Stock [Member]                                                                                                                                                                           |                                                                                                                         |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                                                                                             |                                                                                                                         |   |   |
| Pre-tax compensation expense                                                                                                                                                                                   | $ 880us-gaap_AllocatedShareBasedCompensationExpense/ us-gaap_AwardTypeAxis= clc_DirectorsRestrictedStockMember               | $ 960us-gaap_AllocatedShareBasedCompensationExpense/ us-gaap_AwardTypeAxis= clc_DirectorsRestrictedStockMember | $ 200us-gaap_AllocatedShareBasedCompensationExpense/ us-gaap_AwardTypeAxis= clc_DirectorsRestrictedStockMember |
| Shares of Company common stock issued under the plans                                                                                                                                                          | 15,400us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation/ us-gaap_AwardTypeAxis= clc_DirectorsRestrictedStockMember | 18,256us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation/ us-gaap_AwardTypeAxis= clc_DirectorsRestrictedStockMember | 4,055us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation/ us-gaap_AwardTypeAxis= clc_DirectorsRestrictedStockMember |

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| - Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F
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| X                                                                                                                                                                                                      |
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| - Details**Name:**us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5
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