CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
REVENUES:
Net sales	$ 730,100	$ 712,435	$ 1,466,102	$ 1,289,116
Other revenues	8,163	14,475	17,274	34,379
TOTAL REVENUES	738,263	726,910	1,483,376	1,323,495
COSTS AND EXPENSES:
Cost of sales	123,667	170,739	281,650	275,782
Research and development	134,851	101,261	257,164	206,638
Selling, general and administrative	276,068	258,468	526,754	463,109
Change in fair value of contingent consideration	2,600		4,401
Restructuring charges	4,279	4,581	5,137	5,325
Acquired in-process research and development	0		30,000
Impairment and (gain) loss on sale of assets	48,408		54,056
TOTAL COSTS AND EXPENSES	589,873	535,049	1,159,162	950,854
INCOME FROM OPERATIONS	148,390	191,861	324,214	372,641
OTHER INCOME (EXPENSE):
Interest income	1,253	1,300	2,270	3,230
Interest expense	(24,475)	(28,182)	(48,682)	(54,973)
Change in fair value of investments	99,473		264,208
Other income (expense), net	(26,360)	(9,332)	(29,388)	(16,603)
TOTAL OTHER INCOME (EXPENSE)	49,891	(36,214)	188,408	(68,346)
INCOME BEFORE INCOME TAXES	198,281	155,647	512,622	304,295
INCOME TAX EXPENSE	83,089	63,254	185,820	111,565
NET INCOME	115,192	92,393	326,802	192,730
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTEREST	2,983	(3,329)	2,461	6,899
NET INCOME ATTRIBUTABLE TO CEPHALON, INC.	$ 118,175	$ 89,064	$ 329,263	$ 199,629
BASIC INCOME PER COMMON SHARE ATTRIBUTABLE TO CEPHALON, INC. (in dollars per share)	$ 1.54	$ 1.18	$ 4.32	$ 2.66
DILUTED INCOME PER COMMON SHARE ATTRIBUTABLE TO CEPHALON, INC. (in dollars per share)	$ 1.34	$ 1.11	$ 3.97	$ 2.46
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING ATTRIBUTABLE TO CEPHALON, INC. (in shares)	76,679	75,192	76,213	75,092
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING-ASSUMING DILUTION ATTRIBUTABLE TO CEPHALON, INC. (in shares)	88,303	80,507	82,871	81,223