CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 133,999	$ 131,920
Accounts receivable and unbilled, net (includes $2.8 million and $1.9 million with related parties at March 31, 2020 and December 31, 2019, respectively)	136,374	155,662
Prepaid expenses and other current assets	32,629	29,446
Total current assets	303,002	317,028
Property and equipment, net	50,015	47,292
Operating lease right-of-use assets	58,667	52,152
Goodwill	662,427	662,396
Intangible assets, net	52,353	54,350
Deferred income taxes	490	376
Other assets	10,680	9,477
Total assets	1,137,634	1,143,071
Current liabilities:
Accounts payable (includes $0.1 million and $0.2 million with related parties at March 31, 2020 and December 31, 2019, respectively)	16,985	22,404
Accrued expenses	107,005	109,252
Advanced billings (includes $1.1 million and $3.0 million with related parties at March 31, 2020 and December 31, 2019, respectively)	189,562	192,359
Other current liabilities	25,099	18,987
Total current liabilities	338,651	343,002
Operating lease liabilities	51,395	45,212
Deferred income tax liability	14,022	12,849
Other long-term liabilities	15,767	15,725
Total liabilities	419,835	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 March 31, 2020 and December 31, 2019, respectively	0	0
Common stock - $0.01 par-value; 250,000,000 shares authorized at March 31, 2020 and December 31, 2019, respectively; 35,484,473 and 36,065,278 shares issued and outstanding at March 31, 2020 and December 31, 2019, respectively	355	360
Treasury stock - 200,000 shares at March 31, 2020 and December 31, 2019, respectively	(6,030)	(6,030)
Additional paid-in capital	673,372	666,585
Retained earnings	53,831	68,109
Accumulated other comprehensive loss	(3,729)	(2,741)
Total shareholders’ equity	717,799	726,283
Total liabilities and shareholders’ equity	$ 1,137,634	$ 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).