CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Activities
Net income	$ 266	$ 18,477	$ 26,513
Adjustments to reconcile net income to net cash provided by operating activities, net of effects of acquisitions:
Depreciation	76,883	78,482	71,504
Amortization of intangibles	18,798	20,483	8,596
Amortization of debt issuance costs	514	1,889	660
Share-based compensation	18,609	14,029	18,970
Excess tax benefit from share-based compensation		(1,078)	(829)
(Gain) loss on disposal of property, plant and equipment	1,969	1,091	1,440
(Gain) on securities carried at fair value			(400)
Deferred income taxes	25,326	(15,978)	1,484
Other	(1,814)	1,811	(135)
Changes in operating assets:
Accounts receivable	22,261	533	(9,710)
Inventories	(17,199)	5,176	(2,165)
Prepaid expenses and other current assets	1,494	2,456	12,115
Changes in operating liabilities:
Accounts payable	17,313	2,640	(8,617)
Accrued liabilities	13,079	(3,158)	8,365
Other liabilities	4,495	(8,623)	(1,015)
Income taxes (refundable) payable	(871)	6,512	(8,665)
Net cash provided by operating activities	181,123	124,742	118,111
Investing Activities
Acquisitions, net of cash acquired			(348,887)
(Increase) decrease in restricted cash	624	(944)	786
Purchases of short-term investments	(12,205)	(23,459)	(57,878)
Sales of short-term investments	38,600	56,168	75,834
Purchases of equity securities			(4,553)
Proceeds from sale of equity securities			8,652
Purchases of property, plant and equipment	(111,161)	(58,549)	(133,244)
Proceeds from sales of property, plant and equipment	1,219	156	143
Subsidies and grants	6,968		380
Other	(2,332)	(723)	(679)
Net cash used in investing activities	(78,287)	(27,351)	(459,446)
Financing Activities
Advance on lines of credit and short-term debt	3,375	9,000	1,228
Repayments on lines of credit and short-term debt	(2,391)	(9,000)	(4,287)
Taxes related to net share settlement		(2,528)
Net proceeds from the issuance of common stock	13,606	120	10,192
Excess taxes (paid) benefit from share-based compensation	(278)	1,078	829
Proceeds from long-term debt	44,500	43,500	391,200
Debt issuance costs	(111)	(2,045)	(1,270)
Repayments of long-term debt	(204,374)	(79,913)	(65,986)
Repayments of capital lease obligations	(587)	(19)	(218)
Purchase of treasury stock	(8,745)	(18,014)	(11,009)
Dividend distribution to noncontrolling interest	(5,754)	(4,869)
Other	2,575	(768)	683
Net cash provided by (used in) financing activities	(158,184)	(63,458)	321,362
Effect of exchange rate changes on cash and cash equivalents	11,366	(4,566)	(4,592)
(Decrease) increase in cash and cash equivalents	(43,982)	29,367	(24,565)
Cash and cash equivalents, beginning of year	247,802	218,435	243,000
Cash and cash equivalents, end of year	203,820	247,802	218,435
Cash paid during the year for:
Interest	13,547	11,708	2,799
Income taxes	30,447	17,099	17,229
Non-cash activities:
(Increase) decrease property, plant and equipment purchased on accounts payable	(14,081)	6,393	(4,498)
Acquisition:
Fair value of assets acquired			496,625
Fair value of liabilities assumed			(88,284)
Less cash acquired			(54,774)
Net assets acquired			353,567
Pericom
Non-cash activities:
Share-based awards issued			$ (4,680)
Noncontrolling Interest
Non-cash activities:
Decrease (increase) in dividend accrued for noncontrolling interest	$ 1,008	$ (1,008)