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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:      
Net income (loss) $ 143,796 $ (64,033) $ (1,763)
Adjustments to reconcile net income (loss) to net cash from operating activities:      
Depreciation of property and equipment 17,918 6,721 6,676
Amortization of intangible assets 156,826 99,946 108,450
Stock-based compensation expense 39,135 31,554 31,011
Deferred income tax (34,670) (38,611) (15,578)
Loss on debt extinguishment 8,300 0 0
Other 19,500 2,654 5,322
Changes in operating assets and liabilities, net of business acquisitions:      
Accounts receivable 7,091 6,191 (14,381)
Unbilled contracts receivable, net 76,262 130,359 25,503
Other assets (41,948) 3,675 (950)
Accounts payable (4,863) 1,886 (1,469)
Accrued and other liabilities 21,692 (8,679) (8,915)
Deferred revenue 18,564 (2,410) 1,227
Net cash from operating activities 427,603 169,253 135,133
Cash flows from investing activities:      
Purchases of property and equipment (7,379) (8,813) (3,338)
Proceeds from sale of property and equipment   55  
Net cash received (paid) for mergers and acquisitions 117,424 0 (500)
Purchases of short-term investments (77,178) (40,008) (20,095)
Proceeds from sales of short-term investments 11,225 6,833 8,540
Proceeds from maturities of short-term investments 24,683 27,290 30,925
Purchases of intangible assets (50,935) (4,500) (4,100)
Net cash from investing activities 17,840 (19,143) 11,432
Cash flows from financing activities:      
Repayment of debt (520,250) (150,000) (100,000)
Repayment of assumed debt from merger transaction (734,609) 0 0
Proceeds from debt, net 1,010,286    
Contingent consideration payments after acquisition 0 (1,200) (419)
Dividend paid (30,829) (39,502) (39,187)
Proceeds from exercise of stock options 91 695 8,008
Proceeds from employee stock purchase program 4,764 5,329 5,196
Repurchases of common stock (80,589) (4,506) (44,798)
Net cash from financing activities (351,136) (189,184) (171,200)
Effect of exchange rate changes on cash and cash equivalents 1,330    
Net increase (decrease) in cash and cash equivalents 95,637 (39,074) (24,635)
Cash and cash equivalents at beginning of period 74,551 113,625 138,260
Cash and cash equivalents at end of period 170,188 74,551 113,625
Supplemental disclosure of cash flow information:      
Interest paid 31,240 20,891 23,134
Income taxes paid, net of refunds 43,066 15,001 23,679
Stock issued in merger transaction $ 828,334 $ 0 $ 0