Stock Based Compensation - Narrative (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Share Based Compensation [Abstract]
Outstanding Options, Intrinsic Value	$ 2,022,000
Exercisable Options, Intrinsic Value	1,457,000
Option Award Vesting Period	3 years
Share Based Compensation [Line Items]
Share-based Compensation Expense in Period, Stock Option Awards	1,685,000	1,388,000
ESPP: Purchase Price Percentage	85.00%
ESPP: Discount from Market Price	15.00%
ESPP: Maximum Ownership of Outstanding Shares	An employee whose stock ownership of the Company exceeds five percent of the outstanding common stock is not eligible to participate in this plan.
D S O P 2013 [Member]
Share Based Compensation [Line Items]
Director Stock Ownership Plan Maximum Number of Shares Authorized Under Plan	75,000
Director Stock Ownership Plan Terms	Under the Plan, each director who, on May 1st of the applicable calendar year, owns less than 400% of the annual cash retainer for the applicable calendar year, divided by the average of the closing price of a share of Quaker Common Stock as reported by the composite tape of the New York Stock Exchange for the previous calendar year (the “Threshold Amount”), is required to receive 75% of the annual cash retainer in Quaker common stock and 25% of the retainer in cash, unless the director elects to receive a greater percentage of Quaker common stock (up to 100%) of the annual cash retainer for the applicable year. Each director who owns more than the Threshold Amount may elect to receive common stock in payment of a percentage (up to 100%) of the annual cash retainer.
Director Retainer Annual Fee	50,000
Options Granted in Current Year [Member]
Share Based Compensation [Line Items]
Share-based Compensation Expense in Period, Stock Option Awards	27,000
Unrecognized Share-Based Compensation Expense, Stock Option Awards	859,000
Options Granted in Previous Year [Member]
Share Based Compensation [Line Items]
Unrecognized Share-Based Compensation Expense, Stock Option Awards	522,000
Options Granted in Second Previous Year [Member]
Share Based Compensation [Line Items]
Unrecognized Share-Based Compensation Expense, Stock Option Awards	198,000
Options granted in Third Previous Year [Member]
Share Based Compensation [Line Items]
Unrecognized Share-Based Compensation Expense, Stock Option Awards	4,000
Restricted Stock LTIP Plan
Share Based Compensation [Line Items]
Unrecognized Share-based Compensation Expense, Nonvested Stock Award	5,146,000
Weighted Average Remaining Life, Nonvested Stock Awards	2 years 4 months
Restricted Stock Units (RSUs) LTIP Plan
Share Based Compensation [Line Items]
Unrecognized Share-based Compensation Expense, Nonvested Stock Award	$ 274,000
Weighted Average Remaining Life, Nonvested Stock Awards	2 years 2 months

Total annual director retainer fee

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Description of the maximum number of shares to be held per employee as a percentage of outstanding common stock

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Discount rate from fair value on purchase date that participants pay for shares.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Purchase price of common stock expressed as a percentage of its fair value.

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The maximum number of shares (or other type of equity) that have been approved for issuance in the equity-based payment transaction.

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