CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents	$ 159,784	$ 124,506
Accounts receivable trade, net	701,512	518,975
Other receivables	3,022	1,265
Prepaid taxes	2,191	1,336
Prepaid expenses and other current assets	27,779	26,753
TOTAL CURRENT ASSETS	894,288	672,835
Restricted investments	24,256	23,353
Property and equipment, net	681,451	671,101
Right-of-use assets - operating leases	44,036	43,573
Right-of-use assets - financing leases	1,252	3,557
Other intangibles, net	196,672	163,953
Goodwill, net	576,913	508,555
Other assets	18,426	18,469
TOTAL ASSETS	2,437,294	2,105,396
CURRENT LIABILITIES:
Accounts payable trade	424,923	285,320
Accounts payable other	12,493	12,680
Accrued payroll	56,938	23,044
Accrued other	82,827	102,613
Lease liability - operating leases	11,364	10,093
Lease liability - financing leases	1,251	1,793
Current portion of long-term debt	97,273	93,562
TOTAL CURRENT LIABILITIES	687,069	529,105
Long-term debt	177,479	176,797
Non-current liabilities	41,572	42,910
Lease liability - operating leases	34,916	36,328
Lease liability - financing leases	0	8
Deferred taxes	155,944	162,325
STOCKHOLDERS' EQUITY:
Preferred stock, $.01 par value; 2,000,000 shares authorized; no shares issued or outstanding in 2020 and 2019	0	0
Additional paid-in capital	189,256	186,058
Purchase price in excess of predecessor basis, net of tax benefit of $10,306	15,458	15,458
Retained earnings	1,424,634	1,253,160
Accumulated other comprehensive loss	(207)	(191)
Treasury stock; at cost, 7,675,084 shares in 2021 and 7,675,084 shares in 2020	(258,330)	(266,065)
TOTAL STOCKHOLDERS' EQUITY	1,340,314	1,157,923
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	2,437,294	2,105,396
Class A Common Stock [Member]
STOCKHOLDERS' EQUITY:
Common stock	412	412
Class B Common Stock [Member]
STOCKHOLDERS' EQUITY:
Common stock	$ 7	$ 7