Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 104,147	$ 89,879
Accounts receivable, net	202,139	208,358
Inventories, net	94,090	87,221
Prepaid expenses and other current assets	18,134	21,128
Total current assets	418,510	406,586
Property, plant and equipment, net	83,923	86,704
Goodwill	83,333	86,034
Other intangible assets, net	63,582	71,603
Investments in associated companies	21,316	25,690
Non-current deferred tax assets	6,946	15,460
Other assets	32,055	30,049
Total assets	709,665	722,126
Current liabilities
Short-term borrowings and current portion of long-term debt	670	5,736
Accounts payable	87,819	93,008
Dividends payable	4,935	4,724
Accrued compensation	25,727	22,846
Accrued Pension and Postretirement Benefits, Current	1,211	1,108
Other current liabilities	31,108	27,321
Total current liabilities	151,470	154,743
Long-term debt	35,934	61,068
Non-current deferred tax liabilities	10,003	9,653
Non-current accrued pension and post-retirment benefits	32,360	35,548
Other non-current liabilities	43,529	51,496
Total liabilities	273,296	312,508
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Common stock $1 par value; authorized 30,000,000 shares; issued and outstanding 2018 - 13,338,026 shares; 2017 - 13,307,976 shares	13,338	13,308
Capital in excess of par value	97,304	93,528
Retained earnings	405,125	365,936
Accumulated Other Comprehensive Loss	(80,715)	(65,100)
Total Quaker shareholders equity	435,052	407,672
Noncontrolling interest	1,317	1,946
Total equity	436,369	409,618
Total liabilities and equity	$ 709,665	$ 722,126