Long-Term Debt (Details) (USD $)	Sep. 30, 2011	Jun. 24, 2011	Dec. 31, 2010
Long-Term Debt Detail [Table]
Bank revolving line of credit facility	$ 0		$ 0
5.90% Senior Notes, Series 2006-A	90,000,000		90,000,000
6.30% Senior Notes, Series 2008-A	35,000,000		35,000,000
6.56% Senior Notes, Series 2008-B	90,000,000		90,000,000
5.09% Senior Notes, Series 2010-A	65,000,000		65,000,000
5.67% Senior Notes, Series 2010-B	25,000,000		25,000,000
Partnership line of credit facility	0		0
European bank credit facility	0		0
Other debt	35,000		35,000
Total long-term debt	305,035,000		305,035,000
Less current portion	0		0
Long-term debt, net	305,035,000		305,035,000
Line of credit maximum borrowing capacity		20,000,000
Line of credit reserve		3,000,000
Line of credit sublimit for letters of credit		5,000,000
Line of credit uncommitted expansion feature		20,000,000
Line of credit balance outstanding	$ 0.00

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit available to a subsidiary.

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- Definition

Amount of sublimit applicable to letters of credit under the credit facility.

+ Details

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- Definition

Outstanding balance under the credit facility.

+ Details

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- Definition

Portion of the credit facility required to be set aside as a reserve that cannot be borrowed.

+ Details

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- Definition

Amount of uncommitted expansion feature under the credit facility.

+ Details

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit available to a subsidiary with a scheduled maturity of June 24, 2015.

+ Details

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Senior Notes at 5.90% with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with scheduled maturity of April 30, 2016). Senior note holders are paid off in full before any payments are made to junior note holders.

+ Details

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Senior Notes at 5.67% with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with scheduled maturity of December 15, 2020). Senior note holders are paid off in full before any payments are made to junior note holders.

+ Details

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Senior Notes at 5.09% with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with scheduled maturity of December 15, 2017). Senior note holders are paid off in full before any payments are made to junior note holders.

+ Details

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Senior Notes at 6.56% with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with scheduled maturity of April 30, 2015). Senior note holders are paid off in full before any payments are made to junior note holders.

+ Details

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Senior Notes at 6.30% with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with scheduled maturity of April 30, 2013). Senior note holders are paid off in full before any payments are made to junior note holders.

+ Details

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- Details

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions 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 19, 20, 22

-Article 5

+ Details

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- 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 Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

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

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- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

+ Details

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- Definition

Total of the portions of the carrying amounts as of the balance sheet date of long-term debt, which may include notes payable, bonds payable, debentures, mortgage loans, and commercial paper, which are scheduled to be repaid within one year or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Article 5

+ Details

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- Definition

Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

+ 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

+ Details

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- Definition

Including both current and noncurrent portions, carrying amount as of the balance-sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

+ Details

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