CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents ($38,750 and $ 60,256 related to VIEs. See Note 10)	$ 139,404	$ 170,385
Restricted cash	35,492
Accounts receivable, net	375,763	291,589
Contract assets	360,710	265,902
Prepaid expenses and other current assets	40,103	15,338
Total current assets	951,472	743,214
Property and equipment, net	356,843	311,777
Deferred tax assets	8,887
Intangible assets, net	94,089	44,800
Goodwill	197,071	153,374
Other long-term assets	5,639	2,575
Total assets	1,614,001	1,255,740
Current liabilities:
Accounts payable	219,180	140,943
Contract liabilities	195,326	169,377
Accrued liabilities	130,479	76,027
Dividends payable	3,092	3,087
Current portion of long-term debt	65,376	65,464
Total current liabilities	613,453	454,898
Long-term debt, net of current portion	354,910	193,351
Deferred tax liabilities		13,571
Other long-term liabilities	68,451	31,737
Total liabilities	1,036,814	693,557
Commitments and contingencies (See Note 16)
Stockholders' equity
Common stock—$.0001 par value; 90,000,000 shares authorized; 51,530,572 and 51,448,753 issued and outstanding at June 30, 2018 and December 31, 2017	5	5
Additional paid-in capital	162,928	160,502
Accumulated other comprehensive income	377
Retained earnings	402,158	395,961
Noncontrolling interest	11,719	5,715
Total stockholders’ equity	577,187	562,183
Total liabilities and stockholders’ equity	$ 1,614,001	$ 1,255,740