Collaborative Arrangements Collaborative Arrangements (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 04, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Recognized Collaborative Revenue [Abstract]
Royalty revenues		$ 5,077	$ 13,015	$ 11,869	$ 23,748
Collaborative revenues		611	3,087	1,453	7,344
Total revenues attributable to the Janssen NV collaboration		166,076	138,421	304,585	256,872
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Intangible assets		284,340		284,340		$ 29,000
Goodwill		50,384		50,384		39,915
Deferred tax liability		(112,413)		(112,413)		(15,044)
Restricted cash and cash equivalents (VIE)		88,318		88,318		8,418
Prepaid expenses and other current assets		53,289		53,289		44,175
Other assets		9,136		9,136		3,265
Accounts payable		72,703		72,703		71,194
Accrued expenses		206,030		206,030		209,676
Other liabilities, excluding current portion		41,252		41,252		21,707
Noncontrolling interest		153,252		153,252		21,177
Loss attributable to noncontrolling interest before provision for income taxes		(190,861)	(158,396)	(389,266)	(389,704)
Income tax provision		(30,131)	(693)	(30,430)	(1,496)
Net loss attributable to noncontrolling interest		(32,144)	0	(32,242)	0
Janssen
Recognized Collaborative Revenue [Abstract]
Royalty revenues		59	5,698	1,584	10,633
Collaborative revenues		537	1,483	1,179	2,872
Total revenues attributable to the Janssen NV collaboration		596	$ 7,181	2,763	$ 13,505
Up-front payment						35,000
Parion Sciences, Inc
Recognized Collaborative Revenue [Abstract]
Up-front payment	$ 80,000
Fair value of contingent milestone and royalty payments	175,340
Business combination, consideration transferred	255,340
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Intangible assets	255,340
Goodwill	10,468
Deferred tax liability	(91,023)
Net other assets (liabilities)	(10,468)
Net assets attributable to noncontrolling interests	$ 164,317
Income tax provision				(29,700)
Increase (decrease) in fair value of contingent milestone and royalty payments		(1,600)
Variable Interest Entity, Primary Beneficiary
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Intangible assets		284,340		284,340		29,000
Goodwill		19,391		19,391		8,923
Deferred tax liability		(108,913)		(108,913)		(11,544)
Restricted cash and cash equivalents (VIE)		88,318		88,318		8,418
Prepaid expenses and other current assets		895		895		268
Other assets		508		508		42
Accounts payable		823		823		189
Accrued expenses		34,254		34,254		3,891
Other liabilities, excluding current portion		6,068		6,068		300
Noncontrolling interest		153,252		153,252		$ 21,177
Loss attributable to noncontrolling interest before provision for income taxes		(1,293)		(1,579)
Income tax provision		(29,653)		(29,590)
Increase (decrease) in fair value of contingent milestone and royalty payments		(1,198)		(1,073)
Net loss attributable to noncontrolling interest		$ (32,144)		$ (32,242)