CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 89,424	$ 139,465
Short-term investments		30,992
Customer retention deposits and restricted cash	2,064	481
Accounts receivable, net	386,084	337,382
Costs and estimated earnings in excess of billings	116,517	68,654
Inventory and uninstalled contract materials	65,392	58,116
Deferred tax assets	13,555	13,555
Prepaid expenses and other current assets	31,071	31,720
Total current assets	704,107	680,365
Property and equipment, net	286,386	271,431
Intangible assets, net	38,149	39,581
Goodwill	124,562	119,410
Other long-term assets	2,785	400
Total assets	1,155,989	1,111,187
Current liabilities:
Accounts payable	134,205	128,793
Billings in excess of costs and estimated earnings	144,837	158,595
Accrued expenses and other current liabilities	113,589	83,401
Dividends payable	2,842	2,062
Current portion of capital leases	1,148	1,650
Current portion of long-term debt	47,288	38,909
Current portion of contingent earnout liabilities	349	5,901
Total current liabilities	444,258	419,311
Long-term capital leases, net of current portion	105	657
Long-term debt, net of current portion	206,381	204,029
Deferred tax liabilities	19,484	19,484
Long-term contingent earnout liabilities, net of current portion	1,102	1,021
Other long-term liabilities	11,332	12,899
Total liabilities	$ 682,662	$ 657,401
Commitments and contingencies
Stockholders' equity
Common stock-$.0001 par value, 90,000,000 shares authorized, 51,675,569 and 51,561,396 issued and outstanding at September 30, 2015 and December 31, 2014	$ 5	$ 5
Additional paid-in capital	163,067	160,186
Retained earnings	310,191	293,628
Noncontrolling interests	64	(33)
Total stockholders' equity	473,327	453,786
Total liabilities and stockholders' equity	$ 1,155,989	$ 1,111,187

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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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).