Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net income	$ 13,811	$ 6,223	$ 3,056
Adjustments to reconcile net income to net cash from operating activities
Depreciation and amortization	18,659	20,124	20,841
Amortization of debt costs and other assets	1,024	1,712	1,569
Provision for doubtful accounts	(599)	1,639	1,117
Deferred income taxes	(2,661)	21,286	10,460
Share-based compensation	18,930	12,557	15,966
Other-than-temporary impairment on debt securities		5,585	2,727
Loss on valuation of equity securities	3,050
Changes in fair value of contingent consideration	3,069
Other	1,633	1,398	1,061
Changes in operating assets and liabilities, net of effects of acquisitions
Trade accounts receivable	(3,706)	(6,562)	392
Inventories	9,698	(15,645)	(5,284)
Prepaid expenses and other current assets	(1,127)	(6,352)	701
Trade accounts payable	(170)	2,324	(1,771)
Other current liabilities	(7,563)	(11,412)	6,537
Other long-term assets and liabilities	(4,130)	6,095	1,704
Net cash from operating activities	49,918	38,972	59,076
Cash flows from investing activities
Acquisition of business, net of cash acquired	(44,294)
Capital expenditures for property, plant and equipment	(13,592)	(14,665)	(16,432)
Capital expenditures for intangible assets	(1,664)	(2,283)	(1,902)
Asset acquisitions and other investments	(1,448)
Other investing activities		474	(3,613)
Net cash from investing activities	(60,998)	(16,474)	(21,947)
Cash flows from financing activities
Proceeds from issuance of common shares	7,100	7,783	19,720
Payments related to withholdings for share-based compensation	(3,425)	(3,800)	(2,407)
Payment of debt issuance costs and other financing activities	(682)	(445)
Repurchase and retirement of common shares			(63,425)
Net cash from financing activities	2,993	3,538	(46,112)
Effect of exchange rate changes on cash and restricted cash	(881)	1,180	(739)
Net change in cash, cash equivalents, and restricted cash	(8,968)	27,216	(9,722)
Cash, cash equivalents, and restricted cash at the beginning of the year	81,157	53,941	63,663
Cash, cash equivalents, and restricted cash at the end of the year	72,189	81,157	53,941
Components of cash, cash equivalents, and restricted cash at the end of the year
Cash and cash equivalents	69,623	81,157	39,572
Restricted cash	2,566		14,369
Cash, cash equivalents, and restricted cash at the end of the year	72,189	$ 81,157	$ 53,941
Noncash investing activities:
Purchase of intangible assets	2,015
Contingent consideration recognized at acquisition date	$ 25,491