Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 199,197	$ 175,518
Short-term investments	61,607	71,338
Accounts receivable	58,386	74,396
Inventory	73,409	64,384
Prepaid expenses and other current assets	23,932	25,361
Prepaid income taxes	25,358	29,097
Deferred income taxes	14,940	13,324
Total current assets	456,829	453,418
Intangible assets, net	503,529	617,539
Property, equipment and building improvements, net	10,802	10,848
Goodwill	96,361	96,759
Debt issue costs, net	2,317	2,551
Deferred income taxes	18,091	17,988
Other assets	19,988	20,849
Total assets	1,107,917	1,219,952
Current liabilities:
Accounts payable	16,712	21,254
Contingent consideration	8,094	8,367
Accrued expenses and other current liabilities	74,962	83,503
Income taxes payable	892	904
Total current liabilities	100,660	114,028
Other non-current liabilities	1,064	1,898
Contingent consideration	18,332	17,710
Deferred tax liability, net	123,357	167,484
Long-term debt	163,968	161,793
Total liabilities	407,381	462,913
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; outstanding 65,282,343 shares at March 31, 2013 and 65,113,880 shares at December 31, 2012	163	163
Treasury shares, at cost. 16,042,202 shares at March 31, 2013 and 16,042,202 shares at December 31, 2012	(350,000)	(350,000)
Additional paid-in capital	797,733	789,719
Accumulated other comprehensive loss	(3,495)	(2,975)
Retained earnings	256,135	320,132
Total stockholders' equity	700,536	757,039
Total liabilities and stockholders' equity	$ 1,107,917	$ 1,219,952