Taxes (Details) - USD ($) $ in Thousands	12 Months Ended			168 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Sep. 30, 2019	Jul. 24, 2018
Income Tax Contingency [Line Items]
Federal	$ (11,436)	$ (3,148)	$ 3,656
State	207	239	(1)
Foreign source withholding tax	19,850	25,187	47,592
Current Income Tax Expense (Benefit)	8,621	22,278	51,247
Federal	(21,735)	(63,030)	21,671
State	2,457	(1,554)	(1,074)
Foreign source withholding tax	21,648	14,889	49,832
Deferred income taxes	2,370	(49,695)	70,429
Total	10,991	(27,417)	$ 121,676
Net operating losses	131,501	126,946		$ 131,501
Deferred revenue, net	33,131	39,711		33,131
Tax credit carryforward	11,744	0		11,744
Stock compensation	3,307	5,037		3,307
Patent amortization	18,522	18,520		18,522
Depreciation	443	246		443
Goodwill	(1,933)	0		(1,933)
Other-than-temporary impairment	1,138	490		1,138
Other accrued liabilities	785	2,981		785
Other employee benefits	7,520	6,405		7,520
Right of use asset	(4,913)			(4,913)
Lease liability	5,760			5,760
Deferred Tax Assets Net Before Deducting Valuation Allowance	207,005	200,336		207,005
Less: valuation allowance	(133,797)	(125,158)		(133,797)
Net deferred tax asset	73,208	75,178		73,208
Foreign tax withholding	$ 100	$ 1,500		100
Tax at U.S. statutory rate	21.00%	21.00%	35.00%
State tax provision	10.20%	(8.90%)	0.00%
Effects of rates different than statutory	(2.80%)	(1.40%)	0.00%
Change in valuation allowance	23.30%	8.50%	0.50%
Research and development tax credits	(4.50%)	(4.30%)	(0.80%)
Uncertain tax positions	(0.80%)	3.90%	(2.40%)
Permanent differences	2.30%	4.90%	1.00%
Domestic production activities deduction	0.00%	0.00%	(2.00%)
Stock compensation	(0.60%)	(5.00%)	(4.00%)
Rate change	0.00%	0.00%	14.60%
Foreign derived intangible income deduction	0.00%	(56.30%)	0.00%
Amended return benefit	(8.40%)	(49.40%)	0.00%
Other	2.70%	1.50%	(0.30%)
Total tax provision (benefit)	42.40%	(85.50%)	41.60%
Additions related to additional deduction	$ 300
Unrecognized tax benefits, beginning balance	4,352	$ 3,252	$ 10,397
Additions, tax positions related to current year	402	73	1,009
Reductions, tax positions related to current year	0	0	0
Additions, tax positions related to prior years	34	1,054	0
Reductions, tax positions related to prior years	0	(27)	(1,610)
Settlements, tax positions related to prior years	0	0	(6,544)
Lapses in statues of limitations	(332)	0	0
Unrecognized tax benefits, ending balance	4,456	4,352	3,252	4,456
Income tax penalties and accrued interest	100	100		100
Income tax refund					$ 2,200	$ 97,400
Unrecognized tax benefit		14,700
State
Income Tax Contingency [Line Items]
State net operating losses	1,600,000			1,600,000
Foreign
Income Tax Contingency [Line Items]
Income taxes paid, including foreign withholding taxes	$ 18,800	$ 25,100	$ 46,700
Foreign Govenments with US Tax Treaties | Foreign
Income Tax Contingency [Line Items]
Income taxes paid, including foreign withholding taxes				$ 177,400