CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 17,930	$ 28,557
Accounts receivable trade, net	573,722	583,994
Accounts receivable other	4,467	5,722
Prepaid taxes	12,136	12,088
Prepaid expenses and other current assets	19,009	25,697
TOTAL CURRENT ASSETS	627,264	656,058
Restricted investments	23,265	24,181
Property and equipment, net	568,048	562,150
Other intangibles, net	72,925	74,348
Goodwill, net	348,161	348,661
Other assets	3,607	5,543
TOTAL ASSETS	1,643,270	1,670,941
CURRENT LIABILITIES:
Accounts payable trade	318,962	338,933
Accounts payable other	13,389	12,268
Accrued payroll	22,622	28,994
Accrued other	54,992	59,305
Current portion of capital lease	2,798	2,777
Current portion of long term debt	80,004	77,266
TOTAL CURRENT LIABILITIES	492,767	519,543
Long term debt	194,553	214,808
Non-current liabilities	37,687	37,927
Long term portion of capital lease	6,980	7,696
Deferred taxes	125,611	121,095
STOCKHOLDERS' EQUITY:
Preferred stock, $.01 par value; 2,000,000 shares authorized; no shares issued or outstanding in 2018 and 2017
Additional paid-in capital	165,076	173,011
Purchase price in excess of predecessor basis, net of tax benefit of $10,306	(15,458)	(15,458)
Retained earnings	886,883	870,716
Accumulated other comprehensive loss	(165)	(194)
Treasury stock; at cost,7,510,187 shares in 2018 and 7,777,722 shares in 2017	(251,083)	(258,622)
TOTAL STOCKHOLDERS' EQUITY	785,672	769,872
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,643,270	1,670,941
Class A Common Stock [Member]
STOCKHOLDERS' EQUITY:
Common stock	412	412
Class B Common Stock [Member]
STOCKHOLDERS' EQUITY:
Common stock	$ 7	$ 7