Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$ 49,194	$ 190,515
Accounts receivable, net of allowances of $5,281 and $6,174	1,700,314	1,801,110
Costs and estimated earnings in excess of billings on uncompleted contracts	352,021	290,447
Inventories	64,690	38,921
Prepaid expenses and other current assets	196,445	210,267
Current assets of discontinued operations		22,716
Total current assets	2,362,664	2,553,976
Property and equipment, net of accumulated depreciation of $733,234 and $651,559	1,125,501	1,099,574
Other assets, net	62,915	79,133
Other intangible assets, net of accumulated amortization of $244,933 and $225,367	225,413	243,584
Goodwill	1,596,931	1,596,695
Non-current assets of discontinued operations		739,062
Total assets	5,373,424	6,312,024
Current Liabilities:
Current maturities of long-term debt and short-term borrowings	2,350	8,876
Accounts payable and accrued expenses	938,535	856,245
Billings in excess of costs and estimated earnings on uncompleted contracts	252,505	251,113
Current liabilities of discontinued operations	147,148	21,091
Total current liabilities	1,340,538	1,137,325
Long-term debt and notes payable, net of current maturities	348,209	72,489
Deferred income taxes	226,078	234,379
Insurance and other non-current liabilities	254,685	227,730
Non-current liabilities of discontinued operations		114,561
Total liabilities	$ 2,169,510	$ 1,786,484
Commitments and Contingencies
Equity:
Common stock, value	$ 2	$ 2
Additional paid-in capital	3,489,627	3,592,906
Retained earnings	1,682,772	1,366,791
Accumulated other comprehensive income (loss)	(264,844)	(123,290)
Treasury stock, 71,398,556 and 15,374,866 common shares, at cost	(1,718,185)	(321,936)
Total stockholders' equity	3,189,372	4,514,473
Non-controlling interests	14,542	11,067
Total equity	3,203,914	4,525,540
Total liabilities and equity	$ 5,373,424	$ 6,312,024
Exchangeable Shares [Member]
Equity:
Common stock, value
Series F Preferred Stock [Member]
Equity:
Preferred Stock, value
Series G Preferred Stock [Member]
Equity:
Preferred Stock, value