Debt and Commitments (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Debt and capital lease obligations	$ 346,052	$ 357,718
Less current maturities	(12,904)	(98,071)
Long-term debt and capital lease obligations	333,148	259,647
Fair Value Debt [Abstract]
Debt instrument, fair value disclosure	343,332	363,952
Convertible Debt [Member] \| 3.75% Convertible Notes [Member]
Debt Instrument [Line Items]
Debt instrument, carrying amount	0	92,500
Unamortized debt discount	0	(114)
Debt and capital lease obligations	0	92,386
Fair Value Debt [Abstract]
Debt instrument, fair value disclosure	0	97,713
Convertible Debt [Member] \| 3.375% Convertible Notes [Member]
Debt Instrument [Line Items]
Debt instrument, carrying amount	55,636	55,636
Unamortized debt discount	(5,333)	(7,377)
Debt and capital lease obligations	50,303	48,259
Fair Value Debt [Abstract]
Debt instrument, fair value disclosure	59,038	57,244
Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, carrying amount	281,900	207,900
Fair Value Debt [Abstract]
Debt instrument, fair value disclosure	270,288	199,968
Line of Credit [Member]
Debt Instrument [Line Items]
Debt instrument, carrying amount	12,000	0
Fair Value Debt [Abstract]
Debt instrument, fair value disclosure	12,000	0
Foreign Bank Borrowings and Overdrafts [Member]
Debt Instrument [Line Items]
Debt instrument, carrying amount	1,849	6,955
Fair Value Debt [Abstract]
Debt instrument, fair value disclosure	2,006	7,116
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Debt instrument, carrying amount	0	2,218
Fair Value Debt [Abstract]
Debt instrument, fair value disclosure	$ 0	$ 1,911

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Long-term debt, gross, net of unamortized discounts

+ References

No definition available.

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- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). 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.

+ 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)

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-Publisher FASB

-Name FASB Staff Position (FSP)

-Number APB14-1

-Paragraph 31

-Subparagraph b

-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 20

-Article 5

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

-Publisher SEC

-Name Regulation S-X (SX)

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number APB14-1

-Paragraph 31

-Subparagraph b

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-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 FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 8

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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 or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.

+ 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 SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section H

Reference 3: 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

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- Definition

Obligation related to long-term debt (excluding convertible debt) and capital leases, the portion which is due in one year or less in the future.

+ References

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