Fair Value of Assets and Liabilities - Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Assets held in a rabbi trust	$ 7,364	$ 6,783
Total	265,216	269,629
Fair value liabilities measured on recurring basis
Deferred compensation	7,364	6,783
Total	11,367	11,254
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Fair value assets measured on recurring basis
Assets held in a rabbi trust	7,364	6,783
Total	230,703	265,301
Fair value liabilities measured on recurring basis
Deferred compensation	7,364	6,783
Total	7,364	6,783
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Assets held in a rabbi trust	0	0
Total	34,513	4,328
Fair value liabilities measured on recurring basis
Deferred compensation	0	0
Total	4,003	4,471
Forward Contracts [Member] \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Foreign exchange forward contracts	587	960
Fair value liabilities measured on recurring basis
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	764	913
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
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0	0
Forward Contracts [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Foreign exchange forward contracts	587	960
Fair value liabilities measured on recurring basis
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	764	913
Interest Rate Swap [Member] \| Fair Value, Measurements, Recurring [Member]
Fair value liabilities measured on recurring basis
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	3,239	3,558
Interest Rate Swap [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Fair value liabilities measured on recurring basis
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0	0
Interest Rate Swap [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value liabilities measured on recurring basis
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	3,239	3,558
Certificates Of Deposit [Member] \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Investments, Fair Value Disclosure	223,339	258,518
Certificates Of Deposit [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Fair value assets measured on recurring basis
Investments, Fair Value Disclosure	223,339	258,518
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	33,926	3,368
U.S. dollar indexed bond funds [Member] \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Investments, Fair Value Disclosure	33,926	3,368
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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-SubTopic 10

-Section 45

-Paragraph 6

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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.

+ References

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

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-Name Accounting Standards Codification

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-Name Regulation S-X (SX)

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- Definition

This element represents the aggregate of the liabilities 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

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