CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 160,903	$ 131,920
Accounts receivable and unbilled, net (includes $2.5 million and $1.9 million with related parties at June 30, 2020 and December 31, 2019, respectively)	127,286	155,662
Prepaid expenses and other current assets	30,893	29,446
Total current assets	319,082	317,028
Property and equipment, net	65,954	47,292
Operating lease right-of-use assets	113,566	52,152
Goodwill	662,427	662,396
Intangible assets, net	50,373	54,350
Deferred income taxes	469	376
Other assets	10,263	9,477
Total assets	1,222,134	1,143,071
Current liabilities:
Accounts payable (includes $0.1 million and $0.2 million with related parties at June 30, 2020 and December 31, 2019, respectively)	14,879	22,404
Accrued expenses	102,950	109,252
Advanced billings (includes $1.6 million and $3.0 million with related parties at June 30, 2020 and December 31, 2019, respectively)	195,351	192,359
Other current liabilities	24,804	18,987
Total current liabilities	337,984	343,002
Operating lease liabilities	114,984	45,212
Deferred income tax liability	15,341	12,849
Other long-term liabilities	15,756	15,725
Total liabilities	484,065	416,788
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, 2020 and December 31, 2019, respectively	0	0
Common stock - $0.01 par-value; 250,000,000 shares authorized at June 30, 2020 and December 31, 2019, respectively; 35,408,120 and 36,065,278 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively	354	360
Treasury stock - 200,000 shares at June 30, 2020 and December 31, 2019, respectively	(6,030)	(6,030)
Additional paid-in capital	676,621	666,585
Retained earnings	70,347	68,109
Accumulated other comprehensive loss	(3,223)	(2,741)
Total shareholders’ equity	738,069	726,283
Total liabilities and shareholders’ equity	$ 1,222,134	$ 1,143,071

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).