Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities
Net income	$ 4,655	$ 6,292
Adjustments to reconcile net income to net cash from operating activities
Depreciation and amortization	15,421	15,483
Amortization of debt costs and other assets	1,072	1,259
Provision for doubtful accounts	1,555	1,059
Deferred income taxes	153	1,246
Share-based compensation	9,124	12,154
Other-than-temporary impairment on debt securities	5,585
Other	823	663
Changes in operating assets and liabilities
Restricted cash	14,369
Accounts receivable	(4,302)	5,887
Inventories	(14,714)	(6,638)
Prepaid expenses and other current assets	1,377	(568)
Accounts payable	(2,233)	(2,291)
Other current liabilities	(11,639)	5,502
Other long-term assets and liabilities	2,248	(1,652)
Net cash from operating activities	23,494	38,396
Cash flows from investing activities
Capital expenditures for property, plant and equipment	(11,441)	(12,934)
Capital expenditures for intangible assets	(1,849)	(1,327)
Other investing activities	474	(3,613)
Net cash from investing activities	(12,816)	(17,874)
Cash flows from financing activities
Proceeds from issuance of common shares	6,277	19,688
Payments related to withholdings for share-based compensation	(3,679)	(2,354)
Repurchase and retirement of common shares		(54,996)
Net cash from financing activities	2,598	(37,662)
Effect of exchange rate changes on cash	1,077	301
Net change in cash and cash equivalents	14,353	(16,839)
Cash and cash equivalents at the beginning of the period	39,572	63,663
Cash and cash equivalents at the end of the period	$ 53,925	$ 46,824