Stock Based Compensation - Narrative (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Share-based Compensation [Abstract]
Exercised Options, Intrinsic Value	$ 2,237
Outstanding Options, Intrinsic Value	2,462
Exercisable Options, Intrinsic Value	578
Equity Award Vesting Period	3 years
Share Based Compensation [Line Items]
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.
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
Restricted Stock [Member]
Share Based Compensation [Line Items]
Unrecognized Share-based Compensation Expense, Nonvested Stock Award	2,772
Weighted Average Remaining Life, Nonvested Stock Awards	2 years 4 months
Restricted Stock Units (RSUs) [Member]
Share Based Compensation [Line Items]
Unrecognized Share-based Compensation Expense, Nonvested Stock Award	$ 114
Weighted Average Remaining Life, Nonvested Stock Awards	2 years 2 months