CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents ($15,729 and $ 60,256 related to VIEs. See Note 11)	$ 60,039	$ 170,385
Accounts receivable, net	473,045	291,589
Contract assets	382,492	265,902
Prepaid expenses and other current assets	22,383	15,338
Total current assets	937,959	743,214
Property and equipment, net	369,123	311,777
Deferred tax assets	13,441
Intangible assets, net	85,813	44,800
Goodwill	208,130	153,374
Other long-term assets	6,680	2,575
Total assets	1,621,146	1,255,740
Current liabilities:
Accounts payable	241,288	140,943
Contract liabilities	219,232	169,377
Accrued liabilities	130,382	76,027
Dividends payable	3,072	3,087
Current portion of long-term debt	63,947	65,464
Total current liabilities	657,921	454,898
Long-term debt, net of current portion	306,093	193,351
Deferred tax liabilities		13,571
Other long-term liabilities	64,652	31,737
Total liabilities	1,028,666	693,557
Commitments and contingencies (See Note 17)
Stockholders' equity
Common stock—$.0001 par value; 90,000,000 shares authorized; 51,204,959 and 51,448,753 issued and outstanding at September 30, 2018 and December 31, 2017	5	5
Additional paid-in capital	155,051	160,502
Retained earnings	431,764	395,961
Accumulated other comprehensive income	577
Noncontrolling interest	5,083	5,715
Total stockholders’ equity	592,480	562,183
Total liabilities and stockholders’ equity	$ 1,621,146	$ 1,255,740