Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Total revenues	$ 529,932	$ 521,516	$ 1,027,789	$ 903,798
Product revenues, net
Revenues
Total revenues	433,897	365,524	830,146	700,029
JAKAFI
Revenues
Total revenues	409,506	345,624	785,117	659,344
ICLUSIG
Revenues
Total revenues	24,391	19,900	45,029	40,685
Product royalty revenues
Revenues
Total revenues	76,035	55,953	137,643	103,669
JAKAVI Royalty Revenues
Revenues
Total revenues	56,895	47,101	102,466	88,438
OLUMIANT Royalty Revenues
Revenues
Total revenues	19,140	8,852	35,177	15,231
Milestone and contract revenues
Revenues
Total revenues	$ 20,000	100,000	$ 60,000	100,000
Other revenues
Revenues
Total revenues		$ 39		$ 100