Long-Term Debt (Schedule Of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Debt Instrument [Line Items]
Total debt	$ 682,849	$ 578,330	$ 589,463
Less current portion	22,606	43,617	44,205
Total long-term debt	660,243	534,713	545,258
Domestic And Multi Currency Line Of Credit Due Twenty Eighteen [Member]
Debt Instrument [Line Items]
Total debt	120,225	301,011	288,266
Debt instrument, maturity year	2018
6.12% Senior Unsecured Notes Due 2012 [Member]
Debt Instrument [Line Items]
Total debt	0	0	13,333
Debt instrument, maturity year	2012
Debt instrument, interest rate	6.12%
6.09% Series A Senior Unsecured Notes Due 2016 [Member]
Debt Instrument [Line Items]
Total debt	28,000	28,000	35,000
Debt instrument, maturity year	2016
Debt instrument, interest rate	6.09%
7.26% Senior Unsecured Notes Due 2017 [Member]
Debt Instrument [Line Items]
Total debt	20,000	25,000	25,000
Debt instrument, maturity year	2017
Debt instrument, interest rate	7.26%
Variable Rate Senior Unsecured Note Due 2018 [Member]
Debt Instrument [Line Items]
Total debt	35,417	41,667	43,750
Debt instrument, maturity year	2018
Debt instrument, maturity date	Mar. 31, 2018
5.75% senior unsecured notes due 2018
Debt Instrument [Line Items]
Total debt	300,000	0	0
Debt instrument, maturity year	2018
Debt instrument, interest rate	5.75%
6.00% Series A Senior Unsecured Notes Due 2019 [Member]
Debt Instrument [Line Items]
Total debt	47,000	47,000	47,000
Debt instrument, maturity year	2019
Debt instrument, interest rate	6.00%
6.21%Series B Senior Unsecured Notes Due 2021 [Member]
Debt Instrument [Line Items]
Total debt	20,455	20,455	22,727
Debt instrument, maturity year	2021
Debt instrument, interest rate	6.21%
6.58% Series B Senior Unsecured Notes Due 2022 [Member]
Debt Instrument [Line Items]
Total debt	5,000	5,000	5,000
Debt instrument, maturity year	2022
Debt instrument, interest rate	6.58%
5.25% Convertible Senior Unsecured Notes Due 2029 [Member]
Debt Instrument [Line Items]
Total debt	$ 106,752	$ 110,197	$ 109,387
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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- 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

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(a)(2))

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

Reference 3: 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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- 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

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

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Reference 6: 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

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.

+ 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)

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

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

-Publisher SEC

-Name Regulation S-X (SX)

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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.

+ 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 210.5-02.22)

-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 22

-Article 5

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