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Interim Consolidated Financial Information (Unaudited) - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Interim Consolidated Financial Information (Unaudited)                      
Revenues $ 528,402 $ 449,683 $ 521,516 $ 382,282 $ 444,156 $ 381,534 $ 326,444 $ 384,082 $ 1,881,883    
Product revenues, net                      
Interim Consolidated Financial Information (Unaudited)                      
Revenues 399,200 367,700 365,500 334,500 321,800 322,000 291,700 264,800 1,466,900 $ 1,200,312 $ 882,404
Product royalty revenues                      
Interim Consolidated Financial Information (Unaudited)                      
Revenues                 234,780 160,791 110,711
Product royalty revenues | Non-U.S.                      
Interim Consolidated Financial Information (Unaudited)                      
Revenues 69,200 61,900 56,000 47,700 52,300 44,500 34,800 29,200      
Milestone and contract revenues                      
Interim Consolidated Financial Information (Unaudited)                      
Revenues $ 60,000 $ 20,000 $ 100,000 $ 0 $ 70,000 $ 15,000 $ 0 $ 90,000 $ 180,000 $ 175,000 $ 112,512