CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Activities
Net income	$ 26,513	$ 65,633	$ 24,104
Adjustments to reconcile net income to net cash provided by operating activities, net of effects of acquisitions:
Depreciation	71,504	68,857	65,529
Amortization of intangibles	8,596	7,914	8,078
Impairment of goodwill			5,318
Amortization of debt issuance costs	660	531	531
Share-based compensation	18,970	14,104	13,551
Excess tax benefit from share-based compensation	(829)	(6,018)	6,643
Loss (gain) on disposal of property, plant and equipment	1,440	(963)	270
Gain on securities carried at fair value	(400)	(1,364)	(601)
Deferred income taxes	1,484	(3,611)	(1,959)
Other	(135)	3,624	2,538
Changes in operating assets:
Accounts receivable	(9,710)	1,810	(18,241)
Inventories	(2,165)	(2,750)	14,860
Prepaid expenses and other current assets	12,115	(10,537)	(3,803)
Changes in operating liabilities:
Accounts payable	(8,617)	(9,512)	(8,594)
Accrued liabilities	8,365	2,187	171
Other liabilities	(1,015)	(3,584)	1,957
Income taxes payable	(8,665)	7,951	(461)
Net cash provided by operating activities	118,111	134,272	109,891
Investing Activities
Acquisitions, net of cash acquired	(348,887)		(124,916)
Decrease in restricted cash	786	2,872	6,886
Purchases of short-term investments	(57,878)	(18,839)	(22,922)
Sales of short-term investments	75,834	29,583
Purchases of equity securities	(4,553)	(1,842)	(5,393)
Proceeds from sale of equity securities	8,652	1,660	7,458
Purchases of property, plant and equipment	(133,244)	(57,766)	(47,054)
Proceeds from sales of property, plant and equipment	143	1,480	59
Other	(299)	84	(520)
Net cash used in investing activities	(459,446)	(42,768)	(186,402)
Financing Activities
Advance on lines of credit and short-term debt	1,228	6,778	15,101
Repayments on lines of credit and short-term debt	(4,287)	(11,400)	(34,573)
Net proceeds from the issuance of common stock	10,192	5,761	2,635
Excess tax benefit from share-based compensation	829	6,018	(6,643)
Proceeds from long-term debt	391,200		181,000
Repayments of long-term debt	(65,986)	(42,677)	(42,145)
Repayments of capital lease obligations	(218)	(246)	(627)
Purchase of treasury stock	(11,009)
Other	(587)	7	(2,387)
Net cash provided by (used in) financing activities	321,362	(35,759)	112,361
Effect of exchange rate changes on cash and cash equivalents	(4,592)	(9,380)	3,664
(Decrease) increase in cash and cash equivalents	(24,565)	46,365	39,514
Cash and cash equivalents, beginning of year	243,000	196,635	157,121
Cash and cash equivalents, end of year	218,435	243,000	196,635
Cash paid during the year for:
Interest	2,799	3,276	4,373
Income taxes	17,229	14,059	10,396
Non-cash activities:
Property, plant and equipment purchased on accounts payable	(4,498)	(1,167)	2,714
Acquisition:
Fair value of assets acquired	496,625		247,012
Fair value of liabilities assumed	(88,284)		(92,277)
Cash acquired	(54,774)		(29,819)
Net assets acquired	353,567		$ 124,916
Pericom
Non-cash activities:
Share-based awards issued	$ (4,680)
Noncontrolling Interest
Non-cash activities:
Dividend accrued for noncontrolling interest		$ (1,336)