Revenue Recognition, Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of revenue [Abstract]
Total revenues	$ 173,653	$ 149,434	$ 511,667	$ 367,064
U.S. Government [Member]
Disaggregation of revenue [Abstract]
Total revenues	143,988		409,965
Non-U.S. Government [Member]
Disaggregation of revenue [Abstract]
Total revenues	29,665		101,702
Product Sales [Member]
Disaggregation of revenue [Abstract]
Total revenues	133,269	114,296	389,115	259,875
Product Sales [Member] | U.S. Government [Member]
Disaggregation of revenue [Abstract]
Total revenues	127,332		363,254
Product Sales [Member] | Non-U.S. Government [Member]
Disaggregation of revenue [Abstract]
Total revenues	5,937		25,861
Contract Manufacturing [Member]
Disaggregation of revenue [Abstract]
Total revenues	22,172	18,912	71,963	52,700
Contract Manufacturing [Member] | U.S. Government [Member]
Disaggregation of revenue [Abstract]
Total revenues	0		0
Contract Manufacturing [Member] | Non-U.S. Government [Member]
Disaggregation of revenue [Abstract]
Total revenues	22,172		71,963
Contracts and Grants [Member]
Disaggregation of revenue [Abstract]
Total revenues	18,212	$ 16,226	50,589	$ 54,489
Contracts and Grants [Member] | U.S. Government [Member]
Disaggregation of revenue [Abstract]
Total revenues	16,656		46,711
Contracts and Grants [Member] | Non-U.S. Government [Member]
Disaggregation of revenue [Abstract]
Total revenues	$ 1,556		$ 3,878