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Senior Long-Term Debt And Other Debt	9 Months Ended
	Sep. 30, 2011
Senior Long-Term Debt And Other Debt [Abstract]
Senior Long-Term Debt And Other Debt	5. Senior Long-Term Debt and Other Debt On June 1, 2011, the Company issued $250 million of 5.35% unsecured senior notes due June 1, 2021. Net proceeds to the Company were $247.9 million, which will be used for general corporate purposes, including acquisitions. In addition, proceeds may be used to repay other of the Company's outstanding debt. On September 23, 2011, the Company entered into an amended and restated revolving credit facility, which provides $150 million of capacity for working capital and other general corporate purposes. The capacity of the revolving credit facility may be increased to $300 million subject to certain terms and conditions. The Company may select from two interest rate options for balances outstanding under the facility and pays a commitment fee (0.25% at September 30, 2011) on the unused portion of the facility based on the Company's debt to equity leverage ratio as calculated under the agreement. At September 30, 2011, the Company had no borrowings outstanding under the facility. This facility replaced the Company's previous $270 million revolving credit facility and expires in September 2015.

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- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ 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 210.5-02.19,20,22)

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



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

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