Long-Term Debt (Schedule Of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Debt Instrument [Line Items]
Total debt	$ 700,043	$ 739,989	$ 682,849
Less current portion	0	(22,606)	(22,606)
Total long-term debt	700,043	717,383	660,243
Domestic And Multi Currency Line Of Credit Due Twenty Eighteen [Member]
Debt Instrument [Line Items]
Total debt	9,552	193,717	120,225
Debt instrument, maturity year	2018
6.09% Series A Senior Unsecured Notes Due 2016 [Member]
Debt Instrument [Line Items]
Total debt	0	21,000	28,000
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	0	20,000	20,000
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	0	33,333	35,417
Debt instrument, maturity year	2018
5.75% senior unsecured notes due 2018
Debt Instrument [Line Items]
Total debt	196,470	300,000	300,000
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	0	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	0	18,182	20,455
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	0	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	0	101,757	106,752
Debt instrument, maturity year	2029
Debt instrument, interest rate	5.25%
Subtotal Parent Debt [Member]
Debt Instrument [Line Items]
Total debt	206,022	739,989	682,849
Enova Line of Credit [Member]
Debt Instrument [Line Items]
Total debt	0	0	0
Enova 9.75% senior unsecured notes due 2021 [Member]
Debt Instrument [Line Items]
Total debt	494,021	0	0
Debt instrument, maturity year	2021
Debt instrument, interest rate	9.75%
Subtotal Subsidiary Debt [Member]
Debt Instrument [Line Items]
Total debt	$ 494,021	$ 0	$ 0

The debt instrument's year of maturity.

No definition available.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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)(1))

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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

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

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

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- Definition

Amount of long-term debt, after 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)

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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 SEC

-Name Regulation S-X (SX)

-Number 210

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

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