Business Combinations - Pro-Forma Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Revenues	$ 373,732	$ 259,565	$ 273,300
Net income (loss)	(56,558)	56,089	$ 117,016
DTS Merger
Business Acquisition [Line Items]
Revenues		273,300
Net income (loss)	(56,558)	117,016
Pro forma revenue	434,971	358,911
Pro forma net income	17	(38,139)
Revenue recognized from licensing agreements acquired from DTS	200
Earnings of DTS included in the consolidated statement of operations	22,700
Estimated reduction to historical combined revenue	$ 12,600	$ 52,600