Fair Value of Assets and Liabilities (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Fair value assets measured on recurring basis
Assets held in a rabbi trust	$ 6,800	$ 8,163
Contingent consideration on sale of business	0	2,030
Total	228,435	284,241
Fair value liabilities measured on recurring basis
Deferred compensation	6,800	8,163
Total	11,719	15,594
Foreign exchange forward contracts [Member]
Fair value assets measured on recurring basis
Foreign exchange forward contracts	6,239	925
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	907	4,060
Foreign exchange forward contracts [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
Foreign exchange forward contracts [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Foreign exchange forward contracts	6,239	925
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	907	4,060
Foreign exchange forward contracts [Member] \| Level 3 [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
Certificates Of Deposit [Member]
Fair value assets measured on recurring basis
Fair value measured on recurring basis, investments	199,908	221,706
Certificates Of Deposit [Member] \| Level 1 [Member]
Fair value assets measured on recurring basis
Fair value measured on recurring basis, investments	199,908	221,706
Certificates Of Deposit [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Fair value measured on recurring basis, investments	0	0
Certificates Of Deposit [Member] \| Level 3 [Member]
Fair value assets measured on recurring basis
Fair value measured on recurring basis, investments	0	0
Interest Rate Swap [Member]
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	4,012	3,371
Interest Rate Swap [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] \| Level 2 [Member]
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	4,012	3,371
Interest Rate Swap [Member] \| Level 3 [Member]
Fair value liabilities measured on recurring basis
Fair value Liabilities measured on recurring basis- Derivatives	0	0
U.S. dollar indexed bond funds [Member]
Fair value assets measured on recurring basis
Fair value measured on recurring basis, investments	15,488	51,417
U.S. dollar indexed bond funds [Member] \| Level 1 [Member]
Fair value assets measured on recurring basis
Fair value measured on recurring basis, investments	0	0
U.S. dollar indexed bond funds [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Fair value measured on recurring basis, investments	15,488	51,417
U.S. dollar indexed bond funds [Member] \| Level 3 [Member]
Fair value assets measured on recurring basis
Fair value measured on recurring basis, investments	0	0
Level 1 [Member]
Fair value assets measured on recurring basis
Assets held in a rabbi trust	6,800	8,163
Contingent consideration on sale of business	0	0
Total	206,708	229,869
Fair value liabilities measured on recurring basis
Deferred compensation	6,800	8,163
Total	6,800	8,163
Level 2 [Member]
Fair value assets measured on recurring basis
Assets held in a rabbi trust	0	0
Contingent consideration on sale of business	0	0
Total	21,727	52,342
Fair value liabilities measured on recurring basis
Deferred compensation	0	0
Total	4,919	7,431
Level 3 [Member]
Fair value assets measured on recurring basis
Assets held in a rabbi trust	0	0
Contingent consideration on sale of business	0	2,030
Total	0	2,030
Fair value liabilities measured on recurring basis
Deferred compensation	0	0
Total	$ 0	$ 0

Fair value of assets held under trust.

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- Definition

Fair value of contingent consideration on sale of business.

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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.

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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.

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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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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.

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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.

+ References

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