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Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax assets	$ 4,435				$ 159,099				$ 4,435	$ 159,099
Unbilled Contracts Receivable	673,616								673,616
Contract with Customer, Liability, Current												$ 2,000
Increase (Decrease) in Unbilled Receivables									(145,164)	0	$ 0
Contract and other revenue	(68,563)	$ (59,754)	$ (56,458)	$ (46,426)	(101,891)	$ (99,134)	$ (94,720)	$ (97,351)	(231,201)	(393,096)	(336,597)
Income Tax Expense (Benefit)									87,329	63,851	15,817
Net Income (Loss)	(2,018)	$ (104,893)	$ (15,357)	$ (35,689)	(36,168)	$ 7,695	$ 2,605	$ 3,006	(157,957)	(22,862)	6,820
Contract with Customer, Liability	19,566								19,566			20,737
Accrued Income Taxes, Current	93,670								93,670			105,000
Increase (Decrease) in Income Taxes Payable									(14,550)	861	(175)
Deferred Tax Assets, Gross	302,742				200,971				302,742	200,971		105,000
Deferred Tax Assets, Valuation Allowance	173,878				50,911				173,878	50,911		16,000
Deferred Tax Assets, Net	14,525								14,525			174,000
Accumulated deficit	204,294				636,227				204,294	636,227		(626,000)
Deferred Tax Liabilities, Net, Noncurrent	18,960				$ 9,830				18,960	9,830
Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Income (Loss)									(157,957)	(22,862)	6,820
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
Contract and other revenue									(401,101)
Other Nonoperating Income									(10,896)
Income Tax Expense (Benefit)									87,329
Net Income (Loss)									(15,292)
Contract with Customer, Liability	18,323								18,323
Accrued Income Taxes, Current	3,270								3,270
Deferred Tax Assets, Net	16,881								16,881
Accumulated deficit	(687,917)								(687,917)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (Decrease) in Deferred Income Taxes									(2,079)
Unbilled Contracts Receivable												$ 818,000
Increase (Decrease) in Unbilled Receivables									(673,616)
Contract and other revenue									(169,900)
Other Nonoperating Income									(27,235)
Income Tax Expense (Benefit)									0
Net Income (Loss)									142,665
Increase (Decrease) in Deferred Revenue and Customer Advances and Deposits									(1,243)
Increase (Decrease) in Income Taxes Payable									(90,400)
Accumulated deficit	$ (483,623)								(483,623)
Royalty [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract and other revenue									(130,452)	(289,594)	(264,614)
Royalty [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract and other revenue									(303,221)
Royalty [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract and other revenue									(172,769)
Product Revenue [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract and other revenue									(38,690)	(36,509)	(26,052)
Product Revenue [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract and other revenue									(39,397)
Product Revenue [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract and other revenue									(707)
Contract and other Revenue [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract and other revenue									(62,059)	$ (66,993)	$ (45,931)
Contract and other Revenue [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract and other revenue									(58,483)
Contract and other Revenue [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract and other revenue									$ (3,576)

X

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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. This amount is the total of current and noncurrent accrued income taxes.

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