CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 97,115	$ 161,122
Customer retention deposits and restricted cash	3,033	2,598
Accounts receivable, net	318,074	320,588
Costs and estimated earnings in excess of billings	133,606	116,455
Inventory and uninstalled contract materials	61,833	67,796
Prepaid expenses and other current assets	21,583	18,265
Total current assets	635,244	686,824
Property and equipment, net	293,450	283,545
Deferred tax asset - long-term	1,075	1,075
Intangible assets, net	33,199	36,438
Goodwill	126,161	124,161
Other long-term assets	958	211
Total assets	1,090,087	1,132,254
Current liabilities:
Accounts payable	113,385	124,450
Billings in excess of costs and estimated earnings	122,291	139,875
Accrued expenses and other current liabilities	100,449	93,596
Dividends payable	2,847	2,842
Current portion of capital leases	510	974
Current portion of long-term debt	50,159	54,436
Total current liabilities	389,641	416,173
Long-term capital leases, net of current portion	18	22
Long-term debt, net of current portion	199,868	219,853
Other long-term liabilities	11,953	12,741
Total liabilities	601,480	648,789
Commitments and contingencies
Stockholders' equity
Common stock—$.0001 par value; 90,000,000 shares authorized; 51,772,497 and 51,676,140 issued and outstanding at June 30, 2016 and December 31, 2015	5	5
Additional paid-in capital	165,987	163,344
Retained earnings	321,944	319,899
Noncontrolling interests	671	217
Total stockholders' equity	488,607	483,465
Total liabilities and stockholders' equity	$ 1,090,087	$ 1,132,254