Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 181,833	$ 123,524
Accounts receivable, net	372,974	375,982
Inventories, net	187,764	174,950
Prepaid expenses and other current assets	50,156	41,516
Total current assets	792,727	715,972
Property, plant and equipment, net	203,883	213,469
Right of use lease assets	38,507	42,905
Goodwill	631,212	607,205
Other intangible assets, net	1,081,358	1,121,765
Investments in associated companies	95,785	93,822
Deferred tax assets	16,566	14,745
Other non-current assets	31,796	40,433
Total assets	2,891,834	2,850,316
Current liabilities
Short-term borrowings and current portion of long-term debt	38,967	38,332
Accounts payable	191,821	164,101
Dividends payable	7,051	6,828
Accrued compensation	43,300	45,620
Accrued restructuring	8,248	18,043
Accrued pension and postretirement benefits	1,466	3,405
Other accrued liabilities	92,107	83,605
Total current liabilities	382,960	359,934
Long-term debt	849,068	882,437
Long-term lease liabilities	27,070	31,273
Deferred tax liabilities,net	192,763	211,094
Non-current accrued pension and post-retirment benefits	63,890	56,828
Other non-current liabilities	55,169	66,384
Total liabilities	1,570,920	1,607,950
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Common stock, $1 par value; authorized 30,000,000 shares; issued and outstanding 2020 - 17,850,616 shares; 2019 - 17,735,162 shares	17,851	17,735
Capital in excess of par value	905,171	888,218
Retained earnings	423,940	412,979
Accumulated other comprehensive loss	(26,598)	(78,170)
Total Quaker shareholders' equity	1,320,364	1,240,762
Noncontrolling interest	550	1,604
Total equity	1,320,914	1,242,366
Total liabilities and equity	$ 2,891,834	$ 2,850,316