Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 45,479	$ 55,980
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	31,623	32,298
Amortization	10,379	4,192
Deferred income taxes	2,577	7,481
Gain on the sale of property, plant and equipment	(119)	(56)
Asset impairments	121	84
Stock-based compensation expense	4,302	6,021
Excess tax benefit from stock-based compensation	(299)	(345)
Changes in operating assets and liabilities, net of effects from business acquisition:
Accounts receivable	61,776	52,217
Inventories	13,991	(21,059)
Prepaid expenses and other assets	(302)	(9,015)
Accounts payable	59,183	(9,222)
Accrued liabilities	(535)	529
Income taxes	(146)	(383)
Net cash provided by operations	228,030	118,722
Cash flows from investing activities:
Proceeds from sales of investments at par	200	50
Additions to property, plant and equipment	(24,126)	(31,980)
Proceeds from the sale of property, plant and equipment	237	477
Additions to purchased software	(1,272)	(902)
Business acquisition, net of cash acquired	10,750	0
Other	(224)	187
Net cash used in investing activities	(14,435)	(32,168)
Cash flows from financing activities:
Proceeds from stock options exercised	5,544	1,683
Excess tax benefits from stock-based compensation	299	345
Principal payments on long-term debt and capital lease obligations	(9,224)	(500)
Share repurchases	(40,862)	(52,323)
Net cash used in financing activities	(44,243)	(50,795)
Effect of exchange rate changes	336	(1,041)
Net increase in cash and cash equivalents	169,688	34,718
Cash and cash equivalents at beginning of year	465,995	427,376
Cash and cash equivalents at end of period	$ 635,683	$ 462,094