Fair Value of Assets and Liabilities - Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Assets held in a rabbi trust	$ 7,136	$ 6,783
Total	207,308	269,629
Fair value liabilities measured on recurring basis
Deferred compensation	7,136	6,783
Total	11,602	11,254
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Fair value assets measured on recurring basis
Assets held in a rabbi trust	7,136	6,783
Total	167,422	265,301
Fair value liabilities measured on recurring basis
Deferred compensation	7,136	6,783
Total	7,136	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	39,886	4,328
Fair value liabilities measured on recurring basis
Deferred compensation	0	0
Total	4,466	4,471
Forward Contracts [Member] \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Foreign exchange forward contracts	469	960
Fair value liabilities measured on recurring basis
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	1,861	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	469	960
Fair value liabilities measured on recurring basis
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	1,861	913
Interest Rate Swap [Member] \| Fair Value, Measurements, Recurring [Member]
Fair value liabilities measured on recurring basis
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	2,605	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	2,605	3,558
Certificates Of Deposit [Member] \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Investments, Fair Value Disclosure	160,286	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	160,286	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	39,417	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	39,417	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

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ 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)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ 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=28364263&loc=d3e13433-108611

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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- Definition

Fair value of obligations measured on a recurring basis.

+ 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),(b)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph a, f, g

-Article 7

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 35

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

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