Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 26,863	$ 23,737
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	18,414	21,160
Amortization	5,903	6,740
Deferred income taxes	2,103	2,649
Asset impairments	0	121
Gain on the sale of property, plant and equipment	(167)	(136)
Stock-based compensation expense	4,505	3,981
Excess tax benefit from stock-based compensation	0	(122)
Changes in operating assets and liabilities, net of effects from business acquisitions:
Accounts receivable	49,394	57,044
Inventories	(34,218)	37,034
Prepaid expenses and other assets	(9,658)	(5,864)
Accounts payable	16,675	23,084
Accrued liabilities	13,388	(10,036)
Income taxes	(673)	(1,258)
Net cash provided by operations	92,529	158,134
Cash flows from investing activities:
Proceeds from sales of investments at par	250	200
Additions to property, plant and equipment	(24,039)	(15,149)
Proceeds from the sale of property, plant and equipment	235	188
Additions to purchased software	(2,340)	(1,054)
Other	(105)	(83)
Net cash used in investing activities	(25,999)	(15,898)
Cash flows from financing activities:
Proceeds from stock options exercised	8,094	823
Shares withheld for taxes	(379)	(536)
Excess tax benefits from stock-based compensation	0	122
Principal payments on long-term debt and capital lease obligations	(6,185)	(6,149)
Share repurchases	(2,000)	(29,315)
Debt issuance costs	(433)	0
Net cash used in financing activities	(903)	(35,055)
Effect of exchange rate changes	2,251	72
Net increase in cash and cash equivalents	67,878	107,253
Cash and cash equivalents at beginning of year	681,433	465,995
Cash and cash equivalents at end of period	$ 749,311	$ 573,248