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)	$ (2,654)	$ 3,840
Adjustments to reconcile net income (loss) to net cash from operating activities
Depreciation and amortization	5,075	4,873
Amortization of debt costs and other assets	360	187
Provision for doubtful accounts	532	709
Deferred income taxes	5,074	953
Share-based compensation	2,816	2,099
Other-than-temporary impairment on debt securities	5,585
Other	242	1,340
Changes in operating assets and liabilities
Restricted cash	14,369
Accounts receivable	(2,074)	3,927
Inventories	(2,750)	(1,937)
Prepaid expenses and other current assets	(203)	725
Accounts payable	1,014	(3,352)
Other current liabilities	(23,253)	(8,894)
Other long-term assets and liabilities	(663)	176
Net cash from operating activities	3,470	4,646
Cash flows from investing activities
Capital expenditures for property, plant and equipment	(3,721)	(6,083)
Capital expenditures for intangible assets	(184)	(316)
Other investing activities	474	(1,000)
Net cash from investing activities	(3,431)	(7,399)
Cash flows from financing activities
Proceeds from issuance of common shares	3,876	5,756
Payments related to withholdings for share-based compensation	(2,079)	(1,014)
Repurchase and retirement of common shares		(26,464)
Net cash from financing activities	1,797	(21,722)
Effect of exchange rate changes on cash	244	658
Net change in cash and cash equivalents	2,080	(23,817)
Cash and cash equivalents at the beginning of the period	39,572	63,663
Cash and cash equivalents at the end of the period	$ 41,652	$ 39,846