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Recent Accounting Pronouncements Adopted ASUs (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jan. 01, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Unbilled Contracts Receivable $ 771,002      
Increase (Decrease) in Unbilled Receivables (47,778) $ 0    
Royalties 21,374 68,956    
Sales Revenue, Goods, Net 7,313 10,904    
Contract and other revenue 17,739 17,491    
Revenue, Net 46,426 97,351    
Other Nonoperating Income (9,116) (154)    
Income Tax Expense (Benefit) (3,229) 7,376    
Net Income (Loss) Attributable to Parent (35,689) 3,006    
Deferred tax assets 81,999     $ 159,099
Contract with Customer, Liability 16,985   $ 20,737  
Accrued Income Taxes, Current 108,240   105,000  
Increase (Decrease) in Income Taxes Payable (562) $ 241    
Deferred Tax Assets, Gross 140,500   105,000  
Deferred Tax Assets, Valuation Allowance 66,600   16,000  
Deferred Tax Liabilities, Net 8,143   174,000  
Accumulated deficit (74,255)   626,000 $ (636,227)
Retained Earnings [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative Effect of New Accounting Principle in Period of Adoption     1,100  
Calculated under Revenue Guidance in Effect before Topic 606 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Unbilled Contracts Receivable 0      
Royalties 77,174      
Sales Revenue, Goods, Net 7,556      
Contract and other revenue 15,729      
Revenue, Net 100,459      
Other Nonoperating Income (1,602)      
Income Tax Expense (Benefit) 1,474      
Net Income (Loss) Attributable to Parent 6,127      
Deferred tax assets 172,161      
Contract with Customer, Liability 13,895      
Accrued Income Taxes, Current 4,720      
Deferred Tax Liabilities, Net 8,143      
Accumulated deficit 626,288      
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Unbilled Contracts Receivable     $ 818,000  
Increase (Decrease) in Deferred Income Taxes 90,162      
Increase (Decrease) in Unbilled Receivables (771,002)      
Royalties 55,800      
Sales Revenue, Goods, Net 243      
Change in contract revenue from adoption of ASC 606 (2,010)      
Revenue, Net 54,033      
Other Nonoperating Income (7,514)      
Income Tax Expense (Benefit) 4,703      
Net Income (Loss) Attributable to Parent 41,816      
Increase (Decrease) in Deferred Revenue and Customer Advances and Deposits (3,090)      
Increase (Decrease) in Income Taxes Payable (103,520)      
Increase (Decrease) in Income Taxes 0      
Accumulated deficit $ 552,033