Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities
Net income (loss)	$ 3,056	$ (2,809)	$ (8,537)
Adjustments to reconcile net income (loss) to net cash from operating activities
Depreciation and amortization	20,841	20,923	22,878
Amortization of debt costs and other assets	1,569	1,752	3,621
Provision for doubtful accounts	1,117	3,431	938
Deferred income taxes	10,460	(1,156)	(7,053)
Share-based compensation	15,966	7,214	5,724
Gain on sale of assets		(3,099)
Other-than-temporary impairment on debt securities	2,727
Other	1,061	2,854	821
Changes in operating assets and liabilities
Restricted cash	(14,369)
Trade accounts receivable	392	(1,547)	6,138
Inventories	(5,284)	3,136	8,109
Prepaid expenses and other current assets	701	8,697	5,100
Other long-term assets	(3,333)	(1,321)	(734)
Trade accounts payable	(1,771)	3,011	(6,451)
Other current liabilities	6,537	1,515	5,456
Other long-term liabilities	5,037	1,009	15,154
Net cash from operating activities	44,707	43,610	51,164
Cash flows from investing activities
Capital expenditures for property, plant and equipment	(16,432)	(27,197)	(18,069)
Capital expenditures for intangible assets	(1,902)	(702)	(456)
Purchase of other investments	(3,613)		(1,457)
Purchase of debt securities		(15,250)
Proceeds from sale of assets		4,800	32
Net cash from investing activities	(21,947)	(38,349)	(19,950)
Cash flows from financing activities
Proceeds from issuance of common shares	19,720	5,254	11,074
Payments related to withholdings for share-based compensation	(2,407)	(1,550)	(612)
Repayments of long-term debt			(20,000)
Payment of debt issuance costs		(1,825)
Changes in restricted cash		34,424	(10,662)
Repurchase and retirement of common shares	(63,425)	(11,575)
Net cash from financing activities	(46,112)	24,728	(20,200)
Effect of exchange rate changes on cash	(739)	(3,141)	(3,123)
Net change in cash and cash equivalents	(24,091)	26,848	7,891
Cash and cash equivalents at the beginning of the year	63,663	36,815	28,924
Cash and cash equivalents at the end of the year	39,572	63,663	36,815
Cash paid during the year for:
Interest	672	852	1,315
Income taxes	$ 4,423	$ 3,160	$ 2,222