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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net income (loss) $ (24,892) $ (33,450) $ 3,912
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Amortization of debt issuance costs 0 541 0
Loan fees recognized on extinguishment of debt 0 2,370 0
Depreciation and amortization 17,868 11,711 12,994
Goodwill impairment 3,277 0 0
Gain on disposal of fixed assets 0 0 (11)
Impairment loss on equipment and intangible assets 203 167 92
Provision for bad debts 40 141 35
Net impairment loss on marketable equity securities 346 0 0
Inventory provision 689 1,874 2,305
Share-based compensation expense 5,983 6,471 6,882
Excess tax benefits from equity based awards 0 (112) (282)
Non-cash income tax expense (benefit) (9,185) 7,766 (1,798)
Changes in assets and liabilities:      
Accounts receivable 26,437 (19,963) 3,738
Inventories 122 (9,527) (5,514)
Prepaid expenses and other assets 3,661 (2,461) 4,826
Accounts payable (24,293) 46,020 3,930
Accrued expenses, income taxes and other (1,787) (5,337) 5,552
Net cash provided by (used in) operating activities (1,531) 6,211 36,661
Cash flows from investing activities:      
Purchases of property and equipment (5,987) (10,785) (5,770)
Acquisition of business, net of cash acquired 0 (72,247) 0
Purchases of intangible assets (284) (110) (1,066)
Purchases of securities (36,992) (178,712) (76,967)
Securities maturities/sales 74,922 174,286 66,399
Net cash provided by (used in) investing activities 31,659 (87,568) (17,404)
Cash flows from financing activities:      
Proceeds from the issuance of short-term debt, net of issuance costs 12,000 27,415 0
Principal repayments of short-term debt (12,000) (30,000) 0
Principal payments under capital lease obligations (109) (134) (197)
Proceeds from exercise of stock options and ESPP net of taxes paid on vested restricted stock units (196) 1,491 2,670
Excess tax benefits from stock options exercised 0 112 282
Deposit of restricted funds 0 (188,890) 0
Remittance from restricted funds 0 188,890 0
Net cash provided by (used in) financing activities (305) (1,116) 2,755
Effect of exchange rates on cash and cash equivalents (129) (177) 280
Net increase (decrease) in cash and cash equivalents 29,694 (82,650) 22,292
Cash and cash equivalents, beginning of year 17,375 100,025 77,733
Cash and cash equivalents, end of year 47,069 17,375 100,025
Supplemental disclosures of cash flow information:      
Interest 8 181 12
Income taxes 112 299 294
Supplemental disclosures of non-cash investing activities:      
Building rent incentives to fund leasehold improvements 1,869 0 0
Supplemental disclosures of non-cash financing activities:      
Marketable equity securities received in settlement of note receivable 386 0 0
Accrued debt issuance costs $ 0 $ 326 $ 0