Business Combinations and Other Transactions Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Actual revenue	$ 102,161	$ 72,523	$ 75,609	$ 68,631	$ 75,326	$ 75,079	$ 69,555	$ 87,444	$ 318,924	$ 307,404	$ 532,938
Actual earnings	$ 13,754	$ 2,234	$ 7,743	$ (2,803)	$ 2,083	$ 21,752	$ 10,966	$ 30,230	$ 20,928	$ 65,031	$ 176,220
Net income per share — diluted (in usd per share)	$ 0.44	$ 0.07	$ 0.24	$ (0.09)	$ 0.06	$ 0.61	$ 0.31	$ 0.85	$ 0.66	$ 1.84	$ 4.93
Technicolor Patent Acquisition
Business Acquisition [Line Items]
Supplemental pro forma revenue										$ 314,096	$ 541,921
Supplemental pro forma earnings										$ 52,754	$ 107,531
Supplemental proforma earnings per share - diluted (in usd per share)										$ 1.49	$ 3.01