Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities
Net income (loss)	$ 1,199	$ (3,604)
Adjustments to reconcile net income (loss) to net cash from operating activities
Depreciation and amortization	10,447	10,003
Amortization of debt costs and other assets	719	941
Provision for doubtful accounts	820	957
Deferred income taxes	4,284	687
Share-based compensation	5,492	4,012
Other-than-temporary impairment on debt securities	5,585
Other	572	772
Changes in operating assets and liabilities
Restricted cash	14,369
Accounts receivable	(3,787)	2,443
Inventories	(11,119)	(2,974)
Prepaid expenses and other current assets	2,199	340
Accounts payable	(950)	(2,879)
Other current liabilities	(19,407)	10,664
Other long-term assets and liabilities	(696)	11
Net cash from operating activities	9,727	21,373
Cash flows from investing activities
Capital expenditures for property, plant and equipment	(7,035)	(9,600)
Capital expenditures for intangible assets	(1,558)	(756)
Other investing activities	474	(3,613)
Net cash from investing activities	(8,119)	(13,969)
Cash flows from financing activities
Proceeds from issuance of common shares	5,282	14,828
Payments related to withholdings for share-based compensation	(2,851)	(1,793)
Repurchase and retirement of common shares		(43,885)
Net cash from financing activities	2,431	(30,850)
Effect of exchange rate changes on cash	719	265
Net change in cash and cash equivalents	4,758	(23,181)
Cash and cash equivalents at the beginning of the period	39,572	63,663
Cash and cash equivalents at the end of the period	$ 44,330	$ 40,482