Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents	$ 528,285	$ 529,857
Marketable securities	1,029,193	984,994
Trade accounts receivable, net	429,021	421,752
Inventories	126,154	102,602
Deferred tax assets	45,871	41,432
Prepaid expenses and other current assets	87,356	106,220
Total current assets	2,245,880	2,186,857
Property, plant and equipment, net	218,086	201,109
Intangible assets, net	603,021	609,719
Goodwill	254,073	254,073
Deferred tax assets	3,366	3,394
Other assets	55,240	62,544
Total assets	3,379,666	3,317,696
Liabilities and Stockholders' Equity
Accounts payable	35,339	21,596
Accrued expenses	196,369	402,344
Deferred revenue	58,859	53,801
Current portion of long-term debt	48,000	48,000
Other current liabilities	58,255	56,688
Total current liabilities	396,822	582,429
Long-term debt, less current portioon	45,500	65,000
Contingent consideration	106,241	106,744
Facility lease obligation	38,417	32,230
Deferred tax liabilities	45,986	101,241
Other liabilities	45,722	47,973
Total liabilities	678,688	935,617
Commitments and contingencies
Stockholders' Equity:
Preferred stock, $.0001 par value; 5,000 shares authorized, no shares issued or outstanding	0	0
Common stock, $.0001 par value; 290,000 shares authorized; 199,319 and 197,941 shares issued at March 31, 2014 and December 31, 2013, respectively	20	20
Additional paid-in capital	2,291,363	2,106,183
Treasury stock, at cost, 1,122 and 985 shares at March 31, 2014 and December 31, 2013, respectively	(102,422)	(80,365)
Accumulated other comprehensive loss	(26,435)	(22,857)
Retained earnings	538,452	379,098
Total stockholders' equity	2,700,978	2,382,079
Total liabilities and stockholders' equity	$ 3,379,666	$ 3,317,696