Financial Instruments Measured at Fair Value (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 5,400	$ 5,400
Impairment of Intangible Assets (Excluding Goodwill)		78,000
Impairment of intangible assets (excluding Goodwill), Net of Tax	47,911	47,911
Impairment of Intangible Assets (Excluding Goodwill), Net of Tax Per Share Basic		$ 0.49
Impairment of Intangible Assets (Excluding Goodwill), Net of Tax Per Share Diluted		$ 0.48
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	99,000	99,000
Fair value, available-for-sale securities	38,109	38,109	69,857
Interest rate swaps	378	378
Foreign exchange contracts	694	694	(654)
Fair Value Measurement Contingent Consideration	(6,202)	(6,202)	(5,845)
Total Fair Value Assets And Liabilities Measured On Recurring Basis	131,979	131,979	63,358
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	99,000	99,000
Fair value, available-for-sale securities	38,109	38,109	69,857
Interest rate swaps	0	0
Foreign exchange contracts	0	0	0
Fair Value Measurement Contingent Consideration	0	0	0
Total Fair Value Assets And Liabilities Measured On Recurring Basis	137,109	137,109	69,857
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Fair value, available-for-sale securities	0	0	0
Interest rate swaps	378	378
Foreign exchange contracts	694	694	(654)
Fair Value Measurement Contingent Consideration	0	0	0
Total Fair Value Assets And Liabilities Measured On Recurring Basis	1,072	1,072	(654)
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Fair value, available-for-sale securities	0	0	0
Interest rate swaps	0	0
Foreign exchange contracts	0	0	0
Fair Value Measurement Contingent Consideration	(6,202)	(6,202)	(5,845)
Total Fair Value Assets And Liabilities Measured On Recurring Basis	(6,202)	(6,202)	(5,845)
2013 Acquisition [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	6,000	6,000
Contingent Consideration [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements		1,499
Fair Value Measurement Contingent Consideration Non-Current	3,202	3,202	3,722
Fair Value Measurement Contingent Consideration-Current	$ 3,000	$ 3,000	$ 2,123

Fair Value Measurement Contingent Consideration

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- Definition

Of the contingent consideration, the amount included in Accrued Expenses.

+ References

No definition available.

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Of the contingent consideration, portion that is recorded in other liabilities.

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No definition available.

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- Definition

The amount of impairment loss, net of tax, recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding Goodwill) to fair value.

+ References

No definition available.

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Impairment of Intangible Assets (Excluding Goodwill), Net of Tax Per Share Basic

+ References

No definition available.

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Impairment of Intangible Assets (Excluding Goodwill), Net of Tax Per Share Diluted

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No definition available.

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- Definition

Total Fair Value Assets And Liabilities Measured On Recurring Basis

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No definition available.

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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-Topic 320

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-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

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- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)(3)

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

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- Definition

Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ 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 (c)(2)

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- Definition

Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

+ References

No definition available.

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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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-Topic 350

-SubTopic 30

-Section 50

-Paragraph 3

-Subparagraph (b)

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- Definition

Fair value as of the balance sheet date of all derivative assets designated as interest rate fair value hedging instruments.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(1)

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