Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 331,352	$ 426,732
Short-term investments	128,478	78,439
Account receivable	78,534	43,879
Inventory	60,316	54,388
Prepaid expenses and other current assets	15,059	13,959
Prepaid income taxes	12,137	2,000
Deferred income taxes	10,055	13,744
Total current assets	635,931	633,141
Intangible assets, net	648,659	619,712
Property, equipment and building improvements, net	11,983	11,468
Goodwill	13,184	6,228
Debt issuance costs, net	3,488	2,397
Deferred income taxes	11,786	4,252
Other assets	11,766	10,376
Total assets	1,336,797	1,287,574
Liabilities and Stockholders' Equity
Accounts payable	11,339	10,215
Contingent consideration	7,293	10,973
Accrued expenses and other current liabilities	75,983	48,990
Income taxes payable	4,036	1,944
Total current liabilities	98,651	72,122
Other non-current liabilities	1,967	2,463
Contingent consideration	12,896
Deferred tax liability, net	178,706	176,111
Long-term debt	153,453	145,743
Total liabilities	445,673	396,439
Stockholders' equity:
Preferred stock, par value $0.001 per share. 5,000,000 shares authorized; Series A convertible participating preferred stock; no shares issued and outstanding
Common stock, par value $0.002 per share. 175,000,000 shares authorized; issued and outstanding 70,568,501 shares at December 31, 2011 and 78,141,491 shares at December 31, 2010	159	156
Treasury shares, at cost. 9,159,083 shares at December 31, 2011 and 0 shares at December 31, 2010	(169,661)
Additional paid-in capital	749,519	717,375
Accumulated other comprehensive loss	(3,414)	(258)
Retained earnings	314,521	173,862
Total stockholders' equity	891,124	891,135
Total liabilities and stockholders' equity	$ 1,336,797	$ 1,287,574