Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents		$ 275,319	$ 201,121
Available-for-sale debt securities		10,495	60,534
Accounts receivable, net of allowance for credit losses of $2,740 and $3,012, respectively		128,979	143,683
Unbilled contracts receivable, net	[1]	121,704	77,677
Other current assets		41,258	36,459
Total current assets		577,755	519,474
Long-term unbilled contracts receivable	[2]	43,021	4,107
Property and equipment, net		58,096	60,974
Operating lease right-of-use assets		62,149	68,498
Intangible assets, net		739,354	817,916
Goodwill		850,100	851,088
Other long-term assets		150,826	147,965
Total assets		2,481,301	2,470,022
Current liabilities:
Accounts payable		14,679	7,811
Accrued liabilities		116,007	110,705
Current portion of long-term debt, net		36,210	36,095
Deferred revenue		44,003	35,136
Total current liabilities		210,899	189,747
Deferred revenue, less current portion		32,153	37,107
Long-term deferred tax liabilities		18,227	19,848
Long-term debt, net		711,259	729,392
Noncurrent operating lease liabilities		48,452	54,658
Other long-term liabilities		104,086	98,842
Total liabilities		1,125,076	1,129,594
Commitments and contingencies (Note 15)
Company stockholders’ equity:
Preferred stock: $0.001 par value; (2022: authorized 15,000 shares; 2021: authorized 15,000 shares; and no shares issued and outstanding)
Common stock: $0.001 par value; (2022: authorized 350,000 shares, issued 115,764 shares, outstanding 104,030 shares; 2021: authorized 350,000 shares, issued 113,460, outstanding 103,260 shares)		116	113
Additional paid-in capital		1,380,814	1,340,480
Treasury stock at cost (2022: 11,734 shares; 2021: 10,200 shares)		(206,757)	(178,022)
Accumulated other comprehensive loss		(3,648)	(752)
Retained earnings		196,715	187,814
Total Company stockholders’ equity		1,367,240	1,349,633
Noncontrolling interest		(11,015)	(9,205)
Total equity		1,356,225	1,340,428
Total liabilities and equity		$ 2,481,301	$ 2,470,022

[1] The unbilled contracts receivable increase relates primarily to a change in billing process and to the recognition of revenue from long-term contracts with two customers in the six months ended June 30,2022. The change in billing process has no impact on the Company’s cash flows.

[2] The long-term unbilled contracts receivable increase relates primarily to the recognition of revenue from a multi-year contract with one customer in the six months ended June 30, 2022.