CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 131,920	$ 23,275
Restricted cash	0	7
Accounts receivable and unbilled, net (includes $1.9 million and $3.8 million with related parties at December 31, 2019 and 2018, respectively)	155,662	133,449
Prepaid expenses and other current assets	29,446	21,383
Total current assets	317,028	178,114
Property and equipment, net	47,292	52,255
Operating lease right-of-use assets	52,152	0
Goodwill	662,396	660,981
Intangible assets, net	54,350	69,179
Deferred income taxes	376	713
Other assets	9,477	6,691
Total assets	1,143,071	967,933
Current liabilities:
Accounts payable (includes $0.2 million and $0.3 million with related parties at December 31, 2019 and 2018, respectively)	22,404	16,737
Accrued expenses	109,252	87,493
Advanced billings (includes $3.0 million and $0.4 million with related parties at December 31, 2019 and 2018, respectively)	192,359	147,935
Other current liabilities	18,987	4,861
Total current liabilities	343,002	257,026
Long-term debt, net, less current portion	0	79,721
Operating lease liabilities	45,212	0
Deemed landlord liability, less current portion	0	24,484
Deferred income tax liability	12,849	439
Other long-term liabilities	15,725	16,560
Total liabilities	416,788	378,230
Commitments and contingencies (see Note 12)
Shareholders’ equity:
Preferred stock - $0.01 par-value; 5,000,000 shares authorized; no shares issued and outstanding at December 31, 2019 and 2018, respectively	0	0
Common stock - $0.01 par-value; 250,000,000 shares authorized at December 31, 2019 and 2018, respectively; 36,065,278 and 35,665,910 shares issued and outstanding at December 31, 2019 and 2018, respectively	360	356
Treasury stock - 200,000 shares at December 31, 2019 and 2018, respectively	(6,030)	(6,030)
Additional paid-in capital	666,585	639,381
Retained earnings (accumulated deficit)	68,109	(41,487)
Accumulated other comprehensive loss	(2,741)	(2,517)
Total shareholders’ equity	726,283	589,703
Total liabilities and shareholders’ equity	$ 1,143,071	$ 967,933

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).