Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 85,423	$ 78,687
Accounts receivable, net of allowances of $8,476 and $5,839	2,580,665	2,354,737
Contract assets	573,248	576,891
Inventories	81,117	107,732
Prepaid expenses and other current assets	234,091	208,057
Total current assets	3,554,544	3,326,104
Property and equipment, net of accumulated depreciation of $1,137,165 and $1,092,440	1,317,014	1,276,032
Operating lease right-of-use assets	285,768
Other assets, net	292,092	293,592
Other intangible assets, net of accumulated amortization of $386,403 and $372,081	276,070	280,180
Goodwill	1,927,028	1,899,879
Total assets	7,652,516	7,075,787
Current Liabilities:
Current maturities of long-term debt and short-term debt	44,345	65,646
Current portion of operating lease liabilities	92,293
Accounts payable and accrued expenses	1,238,727	1,314,520
Contract liabilities	403,372	425,961
Total current liabilities	1,778,737	1,806,127
Long-term debt, net of current maturities	1,344,999	1,040,532
Operating lease liabilities, net of current portion	193,475
Deferred income taxes	253,164	219,115
Insurance and other non-current liabilities	357,084	404,560
Total liabilities	3,927,459	3,470,334
Commitments and Contingencies
Equity:
Additional paid-in capital	1,984,505	1,967,354
Retained earnings	2,591,883	2,477,291
Accumulated other comprehensive loss	(267,201)	(286,048)
Treasury stock, 17,032,299 and 16,229,146 common shares	(585,445)	(554,440)
Total stockholders’ equity	3,723,744	3,604,159
Non-controlling interests	1,313	1,294
Total equity	3,725,057	3,605,453
Total liabilities and equity	7,652,516	7,075,787
Common Stock
Equity:
Common stock	2	2
Exchangeable Shares
Equity:
Common stock	0	0
Series G Preferred Stock
Equity:
Preferred stock	$ 0	$ 0