Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 138,285	$ 112,183
Accounts receivable, net of allowances of $4,465 and $2,752	1,985,077	1,500,115
Costs and estimated earnings in excess of billings on uncompleted contracts	497,292	473,308
Inventories	80,890	88,548
Prepaid expenses and other current assets	168,363	114,591
Total current assets	2,869,907	2,288,745
Property and equipment, net of accumulated depreciation of $981,275 and $862,825	1,288,602	1,174,094
Other assets, net	189,866	101,028
Other intangible assets, net of accumulated amortization of $335,507 and $297,313	263,179	187,023
Goodwill	1,868,600	1,603,169
Total assets	6,480,154	5,354,059
Current Liabilities:
Current maturities of long-term debt and short-term debt	1,220	7,563
Accounts payable and accrued expenses	1,057,460	922,819
Billings in excess of costs and estimated earnings on uncompleted contracts	433,387	274,846
Total current liabilities	1,492,067	1,205,228
Long-term debt and notes payable, net of current maturities	670,721	353,562
Deferred income taxes	179,381	192,834
Insurance and other non-current liabilities	342,356	259,733
Total liabilities	2,684,525	2,011,357
Commitments and Contingencies
Equity:
Common stock, value	2	1
Additional paid-in capital	1,889,356	1,749,306
Retained earnings	2,191,059	1,876,081
Accumulated other comprehensive loss	(203,395)	(271,673)
Treasury stock, 1,876,828 and 0 common shares	(85,451)	(14,288)
Total stockholders’ equity	3,791,571	3,339,427
Non-controlling interests	4,058	3,275
Total equity	3,795,629	3,342,702
Total liabilities and equity	6,480,154	5,354,059
Exchangeable Shares
Equity:
Common stock, value	0	0
Series F Preferred Stock
Equity:
Preferred stock, value	0	0
Series G Preferred Stock
Equity:
Preferred stock, value	$ 0	$ 0