CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 89,628	$ 61,435
Accounts receivable trade, net	434,552	477,088
Other receivables	3,945	22,021
Prepaid taxes	5,238	616
Prepaid expenses and other current assets	26,234	27,533
TOTAL CURRENT ASSETS	559,597	588,693
Restricted investments	21,428	19,236
Property and equipment, net	657,826	681,859
Right-of-use assets - operating leases	37,509
Right-of-use assets - financing leases	6,432
Other intangibles, net	124,422	134,788
Goodwill, net	484,514	483,584
Other assets	18,955	16,738
TOTAL ASSETS	1,910,683	1,924,898
CURRENT LIABILITIES:
Accounts payable trade	180,490	272,859
Accounts payable other	13,487	10,906
Accrued payroll	46,915	55,535
Accrued other	96,575	82,900
Lease liability - operating leases	8,665
Lease liability - financing leases	3,021	2,845
Current portion of long term debt	95,772	101,713
TOTAL CURRENT LIABILITIES	444,925	526,758
Long term debt	192,422	229,071
Non-current liabilities	35,011	29,619
Lease liability - operating leases	30,444
Lease liability - financing leases	2,600	4,739
Deferred taxes	160,725	153,877
STOCKHOLDERS' EQUITY:
Preferred stock, $.01 par value; 2,000,000 shares authorized; no shares issued or outstanding in 2019 and 2018
Additional paid-in capital	175,749	172,220
Purchase price in excess of predecessor basis, net of tax benefit of $10,306	(15,458)	(15,458)
Retained earnings	1,151,646	1,072,456
Accumulated other comprehensive loss	(211)	(182)
Treasury stock; at cost, 7,849,464 shares in 2019 and 7,431,083 shares in 2018	(267,589)	(248,621)
TOTAL STOCKHOLDERS' EQUITY	1,044,556	980,834
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,910,683	1,924,898
Class A Common Stock [Member]
STOCKHOLDERS' EQUITY:
Common stock	412	412
Class B Common Stock [Member]
STOCKHOLDERS' EQUITY:
Common stock	$ 7	$ 7