CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 82,843	$ 461,304
Accounts receivable and unbilled, net (includes $6.0 million and $2.7 million with related parties at March 31, 2022 and December 31, 2021, respectively)	224,759	186,432
Prepaid expenses and other current assets	48,367	43,176
Total current assets	355,969	690,912
Property and equipment, net	98,529	93,153
Operating lease right-of-use assets	141,638	129,558
Goodwill	662,396	662,396
Intangible assets, net	40,522	41,360
Deferred income taxes	25,809	25,134
Other assets	19,483	17,422
Total assets	1,344,346	1,659,935
Current liabilities:
Accounts payable (includes $0.7 million and $0.3 million with related parties at March 31, 2022 and December 31, 2021, respectively)	25,434	25,678
Accrued expenses	155,018	159,286
Advanced billings (includes $11.4 million and $8.3 million with related parties at March 31, 2022 and December 31, 2021, respectively)	367,221	344,641
Other current liabilities	31,755	27,612
Total current liabilities	579,428	557,217
Operating lease liabilities	141,624	130,965
Deferred income tax liability	1,055	1,080
Other long-term liabilities	17,223	17,745
Total liabilities	739,330	707,007
Commitments and contingencies (see Note 11)
Shareholders’ equity:
Preferred stock - $0.01 par-value; 5,000,000 shares authorized; no shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively	0	0
Common stock - $0.01 par-value; 250,000,000 shares authorized at March 31, 2022 and December 31, 2021, respectively; 33,651,360 and 36,006,778 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively	336	360
Treasury stock - 81,573 and 180,000 shares at March 31, 2022 and December 31, 2021, respectively	(14,243)	(5,427)
Additional paid-in capital	746,123	727,857
(Accumulated deficit) Retained earnings	(120,812)	234,984
Accumulated other comprehensive loss	(6,388)	(4,846)
Total shareholders’ equity	605,016	952,928
Total liabilities and shareholders’ equity	$ 1,344,346	$ 1,659,935

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).