CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents ($3,127 and $60,256 related to VIEs. See Note 11)	$ 151,063	$ 170,385
Accounts receivable, net	372,695	291,589
Contract assets	364,245	265,902
Prepaid expenses and other current assets	36,444	15,338
Total current assets	924,447	743,214
Property and equipment, net	375,884	311,777
Deferred tax assets	1,457
Intangible assets, net	81,198	44,800
Goodwill	206,159	153,374
Other long-term assets	5,002	2,575
Total assets	1,594,147	1,255,740
Current liabilities:
Accounts payable	249,217	140,943
Contract liabilities	189,539	169,377
Accrued liabilities	117,527	76,027
Dividends payable	3,043	3,087
Current portion of long-term debt	62,488	65,464
Total current liabilities	621,814	454,898
Long-term debt, net of current portion	305,669	193,351
Deferred tax liabilities	8,166	13,571
Other long-term liabilities	51,515	31,737
Total liabilities	987,164	693,557
Commitments and contingencies (See Note 12)
Stockholders' equity
Common stock—$.0001 par value; 90,000,000 shares authorized; 50,715,518 and 51,448,753 issued and outstanding at December 31, 2018 and December 31, 2017	5	5
Additional paid-in capital	144,048	160,502
Retained earnings	461,075	395,961
Accumulated other comprehensive loss	(908)
Noncontrolling interest	2,763	5,715
Total stockholders’ equity	606,983	562,183
Total liabilities and stockholders’ equity	$ 1,594,147	$ 1,255,740

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).