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Goodwill (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Accumulated amortization for goodwill	$ 8,065us-gaap_GoodwillImpairedAccumulatedImpairmentLoss	$ 8,065us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Goodwill [Roll Forward]
Balance, beginning of year	251,241us-gaap_Goodwill	166,386us-gaap_Goodwill
Acquisitions (Note 4)	29,869us-gaap_GoodwillAcquiredDuringPeriod	84,541us-gaap_GoodwillAcquiredDuringPeriod
Foreign currency adjustments	(4,305)us-gaap_GoodwillTranslationAdjustments	(73)us-gaap_GoodwillTranslationAdjustments
Other adjustments	77us-gaap_GoodwillPurchaseAccountingAdjustments	387us-gaap_GoodwillPurchaseAccountingAdjustments
Balance, end of year	$ 276,882us-gaap_Goodwill	$ 251,241us-gaap_Goodwill

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



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-Name Accounting Standards Codification

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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

-Publisher FASB

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-Paragraph 1

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- Definition

Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a,h)

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Topic 350

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-Subparagraph (g)

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Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB

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