CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
OPERATING ACTIVITIES:
Net income	$ (4,050)	$ 6,693
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	11,389	12,576
Deferred income tax (benefit) provision	(1,055)	(983)
Amortization of debt issuance costs	545	760
Non-cash interest expense	1,610	3,528
Loss on disposal of property and equipment	1,865	0
Share-based compensation	2,072	2,070
Excess tax benefits from stock-based compensation arrangements	(23)	(3)
Other	0	277
Changes in assets and liabilities, net of business acquisitions:
Accounts receivable	2,109	4,800
Inventories	(8,885)	(853)
Prepaid expenses and other current assets	2,872	1,619
Other non-current assets	(115)	(152)
Accounts payable, accrued expenses and other current liabilities	(515)	2,121
Deferred revenue	391	(534)
Other non-current liabilities	(364)	399
Net cash provided by operating activities	7,846	32,318
INVESTING ACTIVITIES:
Purchases of property and equipment	(10,853)	(10,412)
Sales of property and equipment	532	0
Cash used in business acquisition, net of cash acquired	(2,766)	(175)
Purchases of short-term investments	0	(53,248)
Net cash used in investing activities	(13,087)	(63,835)
FINANCING ACTIVITIES:
Repayments under senior credit facility	0	(12,813)
Proceeds from exercised stock options	234	250
Excess tax benefits from stock-based compensation arrangements	23	3
Net cash provided by (used in) financing activities	257	(12,560)
Effect of exchange rate changes on cash and cash equivalents	(2,263)	1,911
Net change in cash and cash equivalents	(7,247)	(42,166)
Cash and cash equivalents at beginning of period	96,938	100,808
Cash and cash equivalents at end of period	$ 89,691	$ 58,642