Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue:
Royalty and license fees		$ 373,732	$ 259,565	$ 273,300
Total revenue		373,732	259,565	273,300
Operating expenses:
Cost of revenue		6,308	551	566
Research, development and other related costs		105,849	44,738	32,181
Selling, general and administrative		144,649	72,065	43,592
Amortization expense		111,930	31,870	20,624
Litigation expense, net of settlement		36,496	20,953	14,135
Total operating expenses		405,232	170,177	111,098
Operating income (loss)		(31,500)	89,388	162,202
Interest expense		(28,292)	(2,409)	0
Other income and expense, net		1,449	3,736	3,432
Income (loss) before taxes from continuing operations		(58,343)	90,715	165,634
Provision for (benefit from) income taxes		(1,785)	34,626	48,517
Income (loss) from continuing operations		(56,558)	56,089	117,117
Loss from discontinued operations, net of tax	[1]	0	0	(101)
Net income (loss)		$ (56,558)	$ 56,089	$ 117,016
Income (loss) from continuing operations:
Income (loss) from continuing operations - Basic (in dollars per share)		$ (1.15)	$ 1.14	$ 2.26
Income (loss) from continuing operations - Diluted (in dollars per share)		(1.15)	1.12	2.23
Net income (loss):
Net Income (loss) - Basic (in dollars per share)		(1.15)	1.14	2.26
Net Income (loss) - Diluted (in dollars per share)		(1.15)	1.12	2.23
Cash dividends declared per share (in dollars per share)		$ 0.8	$ 0.8	$ 0.80
Weighted average number of shares used in per share calculations-basic (in shares)		49,251	49,187	51,802
Weighted average number of shares used in per share calculations-diluted (in shares)		49,251	50,190	52,586

[1] Discontinued operations had no impact on net income per share in 2015.