Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net (loss) income	$ (782)	$ 4,500
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	6,004	5,029
Amortization of debt costs	180	180
Provision for doubtful accounts	2,579	1,374
Deferred income taxes	(246)	(6)
Share-based compensation	1,461	1,943
Income tax benefit on employee stock-based awards	412	563
Excess income tax benefit on employee stock-based compensation	(29)	(78)
Other	166	391
Change in operating assets and liabilities:
Trade accounts receivable	(3,780)	8,589
Inventories	(1,690)	(2,100)
Prepaid expenses and other current assets	(2,806)	2,695
Trade accounts payable	(6,670)	(7,247)
Other current liabilities	(4,761)	2,070
Long-term assets	64	(1,805)
Long-term liabilities	(280)	(1,039)
Net cash (used in) provided by operating activities	(10,178)	15,059
Cash flows from investing activities:
Capital expenditures for property, plant and equipment	(3,691)	(6,029)
Capital expenditures for intangible assets	(46)	(44)
Net cash used in investing activities	(3,737)	(6,073)
Cash flows from financing activities:
Net proceeds from issuance of common shares	5,542	2,143
Repayment of bank borrowings, net		(15)
Changes in restricted cash	4,502	(8,141)
Excess income tax benefit on employee stock-based awards	29	78
Net cash provided by (used in) financing activities	10,073	(5,935)
Effect of exchange rate changes on cash	103	(431)
Net (decrease) increase in cash and cash equivalents	(3,739)	2,620
Cash and cash equivalents at the beginning of the period	30,486	31,055
Cash and cash equivalents at the end of the period	$ 26,747	$ 33,675