Description of Business and Summary of Significant Accounting Policies (Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]
Finite-Lived Intangible Assets, Gross	86,301	$ 80,574
Finite-lived intangible assets, accumulated amortization	(36,930)	(29,840)
Estimated future amortization expense	49,371us-gaap_FiniteLivedIntangibleAssetsNet	50,734us-gaap_FiniteLivedIntangibleAssetsNet
Customer Relationships
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]
Finite-Lived Intangible Assets, Gross	66,783	62,408
Customer Relationships \| Minimum
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]
Finite-lived intangible asset, useful life	7 years
Customer Relationships \| Maximum
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]
Finite-lived intangible asset, useful life	20 years
Developed Technology
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]
Finite-Lived Intangible Assets, Gross	15,664	14,630
Developed Technology \| Minimum
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]
Finite-lived intangible asset, useful life	3 years
Developed Technology \| Maximum
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]
Finite-lived intangible asset, useful life	12 years
Trademarks
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]
Finite-Lived Intangible Assets, Gross	2,751	2,646
Trademarks \| Minimum
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]
Finite-lived intangible asset, useful life	3 years
Trademarks \| Maximum
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]
Finite-lived intangible asset, useful life	15 years
Noncompete Agreements
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]
Finite-Lived Intangible Assets, Gross	751	538
Noncompete Agreements \| Maximum
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]
Finite-lived intangible asset, useful life	5 years
Backlog
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]
Finite-Lived Intangible Assets, Gross	140	140
Database
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]
Finite-Lived Intangible Assets, Gross	212	212
Database \| Maximum
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]
Finite-lived intangible asset, useful life	10 years
Customer/Territorial Relationships
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]
Indefinite-lived intangible assets	30,887	$ 30,887

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date of rights not otherwise specified in the taxonomy having a projected indefinite period of benefit.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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