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QUARTERLY SUPPLEMENTAL FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2017		Sep. 30, 2017	Jun. 30, 2017		Mar. 31, 2017	Dec. 31, 2016		Sep. 30, 2016	Jun. 30, 2016		Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 115,867	[1]	$ 61,683	$ 102,513	[1]	$ 55,566	$ 74,577	[1]	$ 30,214	$ 64,392	[1]	$ 29,703	$ 335,629	$ 198,886	$ 191,046
Net income (loss)	$ 32,813		$ 13,520	$ 47,187		$ 10,365	$ 25,819		$ (1,500)	$ 21,802		$ 1,949	$ 103,885	$ 48,070	$ 14,678
Net income (loss) per common share:
Basic	$ 0.70		$ 0.28	$ 0.99		$ 0.22	$ 0.55		$ (0.03)	$ 0.46		$ 0.04	$ 2.19	$ 1.02	$ 0.31
Diluted	$ 0.69		$ 0.28	$ 0.99		$ 0.22	$ 0.55		$ (0.03)	$ 0.46		$ 0.04	$ 2.18	$ 1.02	$ 0.31
[1] The Company receives significant license revenue in the second and fourth quarters; see Note 2 for further details.

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