Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income (loss)	$ (11,029)	$ 18,090
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization of property and equipment	1,834	385
Amortization of intangible assets	28,554	6,022
Stock-based compensation expense	7,081	3,640
Deferred income tax and other, net	(37,950)	2,791
Amortization of premium or discount on investments	87	1,581
Changes in operating assets and liabilities:
Accounts receivable, net	(7,132)	(1,459)
Unbilled contract receivable, net	30,620	0
Other assets	6,575	2,162
Accounts payable	(3,292)	(245)
Accrued legal fees	1,499	3,542
Accrued and other liabilities	183	(3,241)
Deferred revenue	1,932	(3,120)
Net cash from operating activities	18,962	30,148
Cash flows from investing activities:
Purchases of property and equipment	(565)	(2,044)
Purchases of short-term available-for-sale investments	(11,493)	(30,467)
Proceeds from sales of short-term and long-term investments	1,035	15,291
Proceeds from maturities of short-term and long-term investments	4,650	44,191
Net cash from investing activities	(6,373)	26,971
Cash flows from financing activities:
Dividend paid	(9,843)	(9,986)
Repayment of debt	(1,500)	0
Proceeds from exercise of stock options	4,241	798
Proceeds from employee stock purchase program	1,155	1,081
Repurchase of common stock	(3,251)	(38,176)
Net cash from financing activities	(9,198)	(46,283)
Net increase in cash, cash equivalents and restricted cash	3,391	10,836
Cash, cash equivalents and restricted cash at beginning of period	65,626	22,599
Cash, cash equivalents and restricted cash at end of period	69,017	33,435
Supplemental disclosure of cash flow information:
Interest paid	$ 8,100	$ 0