Long-Term Debt (Schedule Of Long-Term Debt) (Details) (USD $)	9 Months Ended
Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Debt Instrument [Line Items]
Total debt	$ 589,463,000	$ 537,291,000	$ 491,980,000
Less current portion	44,205,000	34,273,000	21,856,000
Total long-term debt	545,258,000	503,018,000	470,124,000
Domestic And Multi-Currency Line Of Credit Up To $380,000 [Member]
Debt Instrument [Line Items]
Total debt	288,266,000	280,839,000	224,000,000
Domestic And Multi-Currency Line Of Credit Up To $100,000 Due 2013 [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	100,000,000
Debt instrument, maturity date	May 29, 2013
Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2015 [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	280,000,000
6.00% Series A Senior Unsecured Notes Due 2019 [Member]
Debt Instrument [Line Items]
Total debt	47,000,000	0	0
Debt instrument, maturity year	2019
Debt instrument, interest rate	6.00%
6.58% Series B Senior Unsecured Notes Due 2022 [Member]
Debt Instrument [Line Items]
Total debt	5,000,000	0	0
Debt instrument, maturity year	2022
Debt instrument, interest rate	6.58%
6.21% Senior Unsecured Notes Due 2021 [Member]
Debt Instrument [Line Items]
Total debt	22,727,000	22,727,000	25,000,000
Debt instrument, maturity year	2021
Debt instrument, interest rate	6.21%
6.09% Senior Unsecured Notes Due 2016 [Member]
Debt Instrument [Line Items]
Total debt	35,000,000	35,000,000	35,000,000
Debt instrument, maturity year	2016
Debt instrument, interest rate	6.09%
6.12% Senior Unsecured Notes Due 2012 [Member]
Debt Instrument [Line Items]
Total debt	13,333,000	16,667,000	26,667,000
Debt instrument, maturity year	2012
Debt instrument, interest rate	6.12%
7.26% Senior Unsecured Notes Due 2017 [Member]
Debt Instrument [Line Items]
Total debt	25,000,000	25,000,000	25,000,000
Debt instrument, maturity year	2017
Debt instrument, interest rate	7.26%
Variable Rate Senior Unsecured Note Due 2015 [Member]
Debt Instrument [Line Items]
Total debt	43,750,000	50,000,000	50,000,000
Debt instrument, maturity year	2015
Debt instrument, maturity date	Mar. 31, 2015
5.25% Convertible Senior Unsecured Notes Due 2029 [Member]
Debt Instrument [Line Items]
Total debt	$ 109,387,000	$ 107,058,000	$ 106,313,000
Debt instrument, maturity year	2029
Debt instrument, interest rate	5.25%

The debt instrument's year of maturity.

No definition available.

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Balance Type:	na
Period Type:	instant

- Definition

Interest rate stated in the contractual debt agreement.

+ References

+ Details

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- Details

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ 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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Subparagraph (SX 210.5-02.22(a)(2))

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-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.

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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

-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.

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-Topic 210

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-Subparagraph (SX 210.5-02.19(b),22(b))

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

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-Subparagraph (SX 210.9-03.16)

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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