CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows From Operating Activities:
Net income (loss)	$ 893	$ 2,489
Reconciliation to net cash provided by operating activities:
Loss (gain) on disposal and impairment of long-lived assets	(2,643)	236
Depreciation of property, plant, and equipment	3,100	2,947
Amortization of product rights, trademarks, and patents	721	481
Imputed interest accretion	9	18
Share-based compensation	4,451	3,851
Changes in operating assets and liabilities:
Accounts receivable, net	920	10,198
Inventories	1,891	(10,774)
Prepaid expenses and other assets	344	1,392
Income tax refund, deposits, and payable	394	1,011
Accounts payable and accrued liabilities	12,318	2,081
Net cash provided by operating activities	22,398	13,930
Cash Flows From Investing Activities:
Business Acquisitions		(4,761)
Purchases and construction of property, plant, and equipment	(7,267)	(3,946)
Sale of intangible assets	1,000
Purchase of short-term investments	(1,564)
Maturity of short-term investments	1,345
Changes in restricted short-term investments	(129)
Payment of deposits and other assets	521	(713)
Net cash used in investing activities	(6,094)	(9,420)
Cash Flows From Financing Activities:
Proceeds from equity plans, net of withholding tax payments	(2,173)	(979)
Purchase of treasury stock	(8,203)	(4,722)
Proceeds from issuance of long-term debt		3,725
Principal payments on long-term debt	(1,342)	(5,057)
Net cash provided by financing activities	(11,718)	(7,033)
Effect of exchange rate changes on cash	(174)	(219)
Net increase (decrease) in cash and cash equivalents	4,412	(2,742)
Cash and cash equivalents at beginning of period	72,354	66,074
Cash and cash equivalents at end of period	76,766	63,332
Noncash Investing and Financing Activities:
Equipment acquired under capital leases		301
Supplemental Disclosures of Cash Flow Information:
Interest paid, net of capitalized interest	390	517
Income taxes paid	$ 440	$ 367