Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
OPERATING ACTIVITIES:
Net income (loss)	$ 7,788	$ (4,984)
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:
Depreciation, amortization and other	6,765	5,455
Gain on sale of assets	2	2
Stock-based compensation expense	3,685	2,625
Change in deferred tax assets and liabilities	3,533	(7,159)
Changes in assets and liabilities:
Accounts receivable	2,607	6,321
Inventories	2,471	209
Income tax receivable	7,847	840
Prepaid expenses and other current assets	(283)	110
Accounts payable	(1,241)	(1,461)
Accrued payroll and related expenses	1,635	(1,369)
Accrued royalties	(535)	(4,127)
Accrued income taxes payable	(108)	(6,151)
Other current and non-current liabilities	(437)	(4,368)
Net cash provided by (used for) operating activities	33,729	(14,057)
INVESTING ACTIVITIES:
Acquisitions of property and equipment	(2,956)	(2,325)
Purchase of business, net of cash acquired of $3.1 million		(128,093)
Proceeds from sale of marketable securities		3,999
Other assets	(28)	(225)
Net cash used for investing activities	(2,984)	(126,644)
FINANCING ACTIVITIES:
Payments on lease obligation	(136)	(100)
Purchases of common stock	(625)	(9,181)
Borrowing from line of credit		75,000
Payments on line of credit	(30,000)
Issuance of common stock, net of cancellations	58,815	878
Other	(291)	(68)
Net cash provided by financing activities	27,763	66,529
Net increase (decrease) in cash and cash equivalents	58,508	(74,172)
Cash and cash equivalents, beginning of period	6,788	89,003
Cash and cash equivalents, end of period	65,296	14,831
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	1,154	1,011
Cash paid during the period for income taxes	120	6,500
NON-CASH INVESTING ACTIVITIES:
Purchase of capital equipment by incurring current liabilities	$ 156	$ 436