Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash Flows from Operating Activities
Net income	$ 50,734	$ 50,692
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	14,923	15,449
Stock compensation expense	10,087	6,854
Exit activity costs, non-cash	479	1,088
Benefit of deferred income taxes	(429)	0
Other, net	3,267	1,114
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	(56,645)	(30,534)
Inventories	18,617	(16,263)
Other current assets and other assets	(6,949)	1,052
Accounts payable	22,770	9,237
Accrued expenses and other non-current liabilities	15,640	(479)
Net cash provided by operating activities	72,494	38,210
Cash Flows from Investing Activities
Acquisitions, net of cash acquired	(8,665)	(5,241)
Net proceeds from sale of property and equipment	87	3,147
Purchases of property, plant, and equipment	(7,703)	(6,767)
Net cash used in investing activities	(16,281)	(8,861)
Cash Flows from Financing Activities
Long-term debt payments	(212,000)	(400)
Payment of debt issuance costs	(1,235)	0
Purchase of treasury stock at market prices	(3,495)	(6,549)
Net proceeds from issuance of common stock	400	1,343
Net cash used in financing activities	(216,330)	(5,606)
Effect of exchange rate changes on cash	729	(610)
Net (decrease) increase in cash and cash equivalents	(159,388)	23,133
Cash and cash equivalents at beginning of year	297,006	222,280
Cash and cash equivalents at end of period	$ 137,618	$ 245,413