CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 106,018	$ 139,465
Short-term investments	30,494	30,992
Customer retention deposits and restricted cash	823	481
Accounts receivable, net	299,028	337,382
Costs and estimated earnings in excess of billings	85,120	68,654
Inventory and uninstalled contract materials	60,677	58,116
Deferred tax assets	13,555	13,555
Prepaid expenses and other current assets	37,083	31,720
Total current assets	632,798	680,365
Property and equipment, net	282,046	271,431
Intangible assets, net	37,930	39,581
Goodwill	128,727	119,410
Other long-term assets	400	400
Total assets	1,081,901	1,111,187
Current liabilities:
Accounts payable	121,049	128,793
Billings in excess of costs and estimated earnings	145,982	158,595
Accrued expenses and other current liabilities	75,887	83,401
Dividends payable	2,063	2,062
Current portion of capital leases	1,509	1,650
Current portion of long-term debt	41,226	38,909
Current portion of contingent earnout liabilities	919	5,901
Total current liabilities	388,635	419,311
Long-term capital leases, net of current portion	431	657
Long-term debt, net of current portion	202,617	204,029
Deferred tax liabilities	19,484	19,484
Long-term contingent earnout liabilities, net of current portion	1,048	1,021
Other long-term liabilities	14,119	12,899
Total liabilities	626,334	657,401
Commitments and contingencies
Stockholders' equity
Common stock-$.0001 par value, 90,000,000 shares authorized, 51,665,821 and 51,561,396 issued and outstanding at March 31, 2015 and December 31, 2014	5	5
Additional paid-in capital	162,359	160,186
Retained earnings	293,236	293,628
Noncontrolling interests	(33)	(33)
Total stockholders' equity	455,567	453,786
Total liabilities and stockholders' equity	$ 1,081,901	$ 1,111,187