CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 42,551	$ 461,304
Accounts receivable and unbilled, net (includes $6.6 million and $2.7 million with related parties at June 30, 2022 and December 31, 2021, respectively)	225,695	186,432
Prepaid expenses and other current assets	60,641	43,176
Total current assets	328,887	690,912
Property and equipment, net	103,538	93,153
Operating lease right-of-use assets	135,389	129,558
Goodwill	662,396	662,396
Intangible assets, net	39,684	41,360
Deferred income taxes	26,441	25,134
Other assets	19,118	17,422
Total assets	1,315,453	1,659,935
Current liabilities:
Accounts payable (includes $0.3 million with related parties at June 30, 2022 and December 31, 2021, respectively)	28,800	25,678
Accrued expenses	173,192	159,286
Advanced billings (includes $12.0 million and $8.3 million with related parties at June 30, 2022 and December 31, 2021, respectively)	401,368	344,641
Short-term debt	249,700
Other current liabilities	25,899	27,612
Total current liabilities	878,959	557,217
Operating lease liabilities	134,977	130,965
Deferred income tax liability	1,002	1,080
Other long-term liabilities	17,263	17,745
Total liabilities	1,032,201	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 June 30, 2022 and December 31, 2021, respectively	0	0
Common stock - $0.01 par-value; 250,000,000 shares authorized at June 30, 2022 and December 31, 2021, respectively; 30,987,636 and 36,006,778 shares issued and outstanding at June 30, 2022 and December 31, 2021, respectively	309	360
Treasury stock - 81,573 and 180,000 shares at June 30, 2022 and December 31, 2021, respectively	(14,243)	(5,427)
Additional paid-in capital	753,300	727,857
(Accumulated deficit) Retained earnings	(446,142)	234,984
Accumulated other comprehensive loss	(9,972)	(4,846)
Total shareholders’ equity	283,252	952,928
Total liabilities and shareholders’ equity	$ 1,315,453	$ 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).