Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net income	$ 17,503	$ 2,653
Adjustments to reconcile net income to net cash from operating activities:
Depreciation of property and equipment	11,371	11,198
Amortization of intangible assets	78,485	104,437
Stock-based compensation expense	32,284	28,054
Deferred income taxes	(1,641)	(1,796)
Loss on debt extinguishment	0	8,012
Other	3,148	8,289
Changes in operating assets and liabilities:
Accounts receivable	14,820	(9,260)
Unbilled contracts receivable	(82,767)	5,978
Other assets	(1,291)	(24,096)
Accounts payable	6,868	1,307
Accrued and other liabilities	4,340	(44,096)
Deferred revenue	3,913	(7,701)
Net cash from operating activities	87,033	82,979
Cash flows from investing activities:
Purchases of property and equipment	(8,870)	(4,858)
Proceeds from sale of property and equipment	86	19
Net cash paid for acquisitions	0	(17,400)
Purchases of intangible assets	(233)	(92)
Purchases of short-term investments	(4,490)	(45,755)
Proceeds from sales of investments	28,254	44,321
Proceeds from maturities of investments	26,053	17,550
Net cash from investing activities	40,800	(6,215)
Cash flows from financing activities:
Dividends paid	(10,418)	(10,514)
Repayment of debt	(20,250)	(63,750)
Proceeds from debt, net of debt discount and issuance costs	0	(6,843)
Proceeds from employee stock purchase program and exercise of stock options	8,059	7,247
Repurchases of common stock	(28,735)	(43,324)
Net cash from financing activities	(51,344)	(117,184)
Effect of exchange rate changes on cash and cash equivalents	(2,291)	(808)
Net increase (decrease) in cash and cash equivalents	74,198	(41,228)
Cash and cash equivalents at beginning of period	201,121	170,188
Cash and cash equivalents at end of period	275,319	128,960
Supplemental disclosure of cash flow information:
Interest paid	15,590	17,677
Income taxes paid, net of refunds	$ 13,400	$ 14,909