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Recent Accounting Pronouncements Adopted ASUs (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Unbilled Contracts Receivable $ 750,875   $ 750,875      
Increase (Decrease) in Unbilled Receivables     (67,905) $ 0    
Royalties 30,049 $ 69,990 51,423 138,946    
Sales Revenue, Goods, Net 8,087 8,401 15,400 19,305    
Contract and other revenue 18,322 16,329 36,061 33,820    
Revenue, Net 56,458 94,720 102,884 192,071    
Other Nonoperating Income (8,249) (129) (17,365) (283)    
Income Tax Expense (Benefit) (1,015) 2,507 (4,244) 9,883    
Net Income (Loss) Attributable to Parent (15,357) $ 2,605 (51,046) 5,611    
Deferred tax assets 82,111   82,111     $ 159,099
Contract with Customer, Liability 13,900   13,900   $ 20,737  
Accrued Income Taxes, Current 103,598   103,598   105,000  
Increase (Decrease) in Income Taxes Payable     (5,204) $ (4,621)    
Deferred Tax Assets, Gross 142,700   142,700   105,000  
Deferred Tax Assets, Valuation Allowance 66,900   66,900   16,000  
Deferred Tax Liabilities, Net         174,000  
Accumulated deficit (97,383)   (97,383)   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   0      
Royalties 73,626   150,800      
Sales Revenue, Goods, Net 8,221   15,777      
Contract and other revenue 16,973   32,702      
Revenue, Net 98,820   199,279      
Other Nonoperating Income (1,208)   (2,810)      
Income Tax Expense (Benefit) 4,791   6,265      
Net Income (Loss) Attributable to Parent 14,158   20,285      
Deferred tax assets 177,591   177,591      
Contract with Customer, Liability 12,693   12,693      
Accrued Income Taxes, Current 5,865   5,865      
Accumulated deficit 652,340   652,340      
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 95,480          
Increase (Decrease) in Unbilled Receivables (750,875)          
Royalties 43,577   99,377      
Sales Revenue, Goods, Net 134   377      
Change in contract revenue from adoption of ASC 606 (1,349)   (3,359)      
Revenue, Net 42,362   96,395      
Other Nonoperating Income (7,041)   (14,555)      
Income Tax Expense (Benefit) 5,806   10,509      
Net Income (Loss) Attributable to Parent 29,515   71,331      
Increase (Decrease) in Deferred Revenue and Customer Advances and Deposits (1,207)          
Increase (Decrease) in Income Taxes Payable (97,733)          
Accumulated deficit $ 554,957   $ 554,957