Fair Value of Assets and Liabilities - Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Assets held in a rabbi trust	$ 7,051	$ 7,170
Total	276,026	296,216
Fair value liabilities measured on recurring basis
Deferred compensation	7,051	7,170
Total	12,525	12,949
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Fair value assets measured on recurring basis
Assets held in a rabbi trust	7,051	7,170
Total	259,175	276,203
Fair value liabilities measured on recurring basis
Deferred compensation	7,051	7,170
Total	7,051	7,170
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Assets held in a rabbi trust	0	0
Total	16,851	20,013
Fair value liabilities measured on recurring basis
Deferred compensation	0	0
Total	5,474	5,779
Forward Contracts [Member] \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Foreign exchange forward contracts	512	2,193
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	1,604	1,983
Forward Contracts [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Fair value assets measured on recurring basis
Foreign exchange forward contracts	0	0
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	0	0
Forward Contracts [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Foreign exchange forward contracts	512	2,193
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	1,604	1,983
Interest Rate Swap [Member] \| Fair Value, Measurements, Recurring [Member]
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	3,870	3,796
Interest Rate Swap [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	0	0
Interest Rate Swap [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	3,870	3,796
Certificates Of Deposit [Member] \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Investments, Fair Value Disclosure	252,124	269,033
Certificates Of Deposit [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Fair value assets measured on recurring basis
Investments, Fair Value Disclosure	252,124	269,033
Certificates Of Deposit [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Investments, Fair Value Disclosure	0	0
U.S. dollar indexed bond funds [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Investments, Fair Value Disclosure	16,339	17,820
U.S. dollar indexed bond funds [Member] \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Investments, Fair Value Disclosure	16,339	17,820
U.S. dollar indexed bond funds [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Fair value assets measured on recurring basis
Investments, Fair Value Disclosure	$ 0	$ 0

Fair value of assets held under trust.

No definition available.

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

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- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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+ Details

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- Definition

Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date.

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- Definition

This element represents a certain statement of financial position liability caption which represents a class of liabilities, or which may include an individual liability, measured at fair value on a recurring basis.

+ References

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-Publisher FASB

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-Paragraph 32

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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. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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

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- Definition

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+ References

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