Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash Flows from Operating Activities
Net income	$ 73,111	$ 50,734
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17,325	14,923
Stock compensation expense	6,151	10,087
Gain on sale of business	(1,881)	0
Exit activity costs, non-cash	505	479
Provision for (benefit of) deferred income taxes	668	(429)
Other, net	1,402	3,267
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	(40,176)	(56,645)
Inventories	6,102	18,617
Other current assets and other assets	6,095	(6,949)
Accounts payable	13,408	22,770
Accrued expenses and other non-current liabilities	(26,516)	15,640
Net cash provided by operating activities	56,194	72,494
Cash Flows from Investing Activities
Acquisitions, net of cash acquired	(54,385)	(8,665)
Net proceeds from sale of property and equipment	568	87
Purchases of property, plant, and equipment	(9,335)	(7,703)
Net proceeds from sale of business	2,000	0
Net cash used in investing activities	(61,152)	(16,281)
Cash Flows from Financing Activities
Long-term debt payments	0	(212,000)
Payment of debt issuance costs	0	(1,235)
Purchase of treasury stock at market prices	(6,408)	(3,495)
Net proceeds from issuance of common stock	377	400
Net cash used in financing activities	(6,031)	(216,330)
Effect of exchange rate changes on cash	(558)	729
Net decrease in cash and cash equivalents	(11,547)	(159,388)
Cash and cash equivalents at beginning of year	191,363	297,006
Cash and cash equivalents at end of period	$ 179,816	$ 137,618