Fair Value of Assets and Liabilities - Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Total	$ 219,274	$ 254,747
Fair value liabilities measured on recurring basis
Total	15,063	13,092
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Fair value assets measured on recurring basis
Total	179,813	225,387
Fair value liabilities measured on recurring basis
Total	10,161	10,377
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Total	39,461	29,360
Fair value liabilities measured on recurring basis
Total	4,902	2,715
Forward Contracts [Member] \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Foreign exchange forward contracts	96	1,382
Fair value liabilities measured on recurring basis
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	2,828	364
Forward Contracts [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Foreign exchange forward contracts	96	1,382
Fair value liabilities measured on recurring basis
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	2,828	364
Interest Rate Swap [Member] \| Fair Value, Measurements, Recurring [Member]
Fair value liabilities measured on recurring basis
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	2,074	2,351
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	2,074	2,351
Certificates Of Deposit [Member] \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Investments, Fair Value Disclosure	169,652	215,010
Certificates Of Deposit [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Fair value assets measured on recurring basis
Investments, Fair Value Disclosure	169,652	215,010
U.S. dollar indexed bond funds [Member] \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Investments, Fair Value Disclosure	39,365	27,978
U.S. dollar indexed bond funds [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Investments, Fair Value Disclosure	39,365	27,978
Assets held in rabbi trusts [Member]
Fair value assets measured on recurring basis
Assets held in a rabbi trust	10,161	10,377
Assets held in rabbi trusts [Member] \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Assets held in a rabbi trust	10,161	10,377
Fair value liabilities measured on recurring basis
Deferred compensation	10,161	10,377
Assets held in rabbi trusts [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Fair value assets measured on recurring basis
Assets held in a rabbi trust	10,161	10,377
Fair value liabilities measured on recurring basis
Deferred compensation	$ 10,161	$ 10,377

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

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

-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

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

-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

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

-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

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-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

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

-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

+ Details

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