Significant Accounting Policies - Narrative (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Significant Accounting Policies [Abstract]
Revenue Recognized Under Net Reporting Arrangements	$ 46,844kwr_Netreportingamount	$ 41,553kwr_Netreportingamount	$ 39,299kwr_Netreportingamount
Research and Development Expense	22,134us-gaap_ResearchAndDevelopmentExpense	21,578us-gaap_ResearchAndDevelopmentExpense	19,993us-gaap_ResearchAndDevelopmentExpense
Measurement of Tax Benefit, Minimum Likelihood of the Largest Amount Being Realized Upon Ultimate Settlement	50.00%
Schedule Of Equity Method Investments [Line Items]
Impact Of Restatement On Opening Retained Earnings Net Of Tax		335
Customer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for Doubtful Accounts	$ 825	$ 0	$ 1,254
Effect Of Customer Bankruptcies Per Diluted Share	$ 0.05		$ 0.06

Reflects the effect on diluted earnings per share due to customer bankruptcies during the period

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Income Tax Examination Minimum Likelihood of Tax Benefits Being Realized Upon Ultimate Settlement

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Amount recognized as revenue under net reporting arrangements

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Amount after tax of cumulative effect of restatement on the opening retained earnings of the earliest year presented.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 250

-SubTopic 10

-Section 50

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22663-107794

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-Name Accounting Standards Codification

-Topic 250

-SubTopic 10

-Section 50

-Paragraph 8

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-Name Accounting Standards Codification

-Topic 250

-SubTopic 10

-Section 50

-Paragraph 7

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

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-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-03.5)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 5

-Article 5

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 985

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 730

-SubTopic 10

-Section 50

-Paragraph 1

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