Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 294,572	$ 447,858
Receivables, net of allowance for credit loss of $32,472 and $32,838	2,092,613	1,974,381
Contract assets, net of allowance for credit loss	123,558	132,874
Prepaid expenses and other	95,896	85,005
Total current assets	2,606,639	2,640,118
Property and equipment, net	211,799	208,423
Goodwill	1,450,999	1,291,760
Other intangible assets, net	132,013	90,931
Right-of-use lease assets	345,908	310,860
Deferred tax assets	14,605	13,485
Other assets	86,357	85,483
Total assets	4,848,320	4,641,060
Current liabilities:
Accounts payable	1,098,905	984,604
Outstanding checks	51,649	78,231
Accrued expenses:
Compensation	88,528	112,784
Transportation expense	93,900	101,194
Income taxes	14,473	12,354
Other accrued liabilities	65,930	62,706
Current lease liabilities	70,423	61,280
Current portion of debt	320,917	142,885
Total current liabilities	1,804,725	1,556,038
Long-term debt	1,092,660	1,092,448
Noncurrent lease liabilities	286,210	259,444
Noncurrent income taxes payable	21,576	22,354
Deferred tax liabilities	55,766	39,776
Other long-term liabilities	265	270
Total liabilities	3,261,202	2,970,330
Stockholders’ investment:
Preferred stock, $0.10 par value, 20,000 shares authorized; no shares issued or outstanding	0	0
Common stock, $0.10 par value, 480,000 shares authorized; 179,700 and 179,380 shares issued, 134,586 and 134,895 outstanding	13,459	13,490
Additional paid-in capital	533,819	546,646
Retained earnings	4,153,109	4,144,834
Accumulated other comprehensive loss	(108,344)	(76,149)
Treasury stock at cost (45,114 and 44,485 shares)	(3,004,925)	(2,958,091)
Total stockholders’ investment	1,587,118	1,670,730
Total liabilities and stockholders’ investment	$ 4,848,320	$ 4,641,060