Other Income (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Income and Expenses [Abstract]
Reduction of (accrual for) loss contingency related to legal proceedings (Footnote 7)									$ 1,168	$ 101,978	$ 69,557
Gain on sale of a product line									0	0	6,522
Gain on sale of cost method investments									0	0	5,463
Recovery of INOVA bad debts									3,983	0	0
Loss on bond exchange									(2,182)	0	0
Other income									(1,619)	(3,703)	(1,682)
Total other income (expense)	$ 4,974	$ (2,027)	$ (1,717)	$ 120	$ 240	$ (346)	$ 101,600	$ (3,219)	1,350	98,275	79,860
Proceeds from sale of Source product line									0	0	14,394
Total proceeds from sale of cost method investments											16,500
Proceeds from sale of cost method investments									$ 2,698	$ 0	$ 14,051