CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 26,753	$ 28,557
Accounts receivable trade, net	615,690	583,994
Accounts receivable other	3,851	5,722
Prepaid taxes	5,268	12,088
Prepaid expenses and other current assets	15,763	25,697
TOTAL CURRENT ASSETS	667,325	656,058
Restricted investments	24,107	24,181
Property and equipment, net	618,931	562,150
Other intangibles, net	71,501	74,348
Goodwill, net	348,106	348,661
Other assets	3,534	5,543
TOTAL ASSETS	1,733,504	1,670,941
CURRENT LIABILITIES:
Accounts payable trade	348,222	338,933
Accounts payable other	12,418	12,268
Accrued payroll	36,487	28,994
Accrued other	78,598	59,305
Current portion of capital lease	2,794	2,777
Current portion of long term debt	86,740	77,266
TOTAL CURRENT LIABILITIES	565,259	519,543
Long term debt	179,444	214,808
Non-current liabilities	39,083	37,927
Long term portion of capital lease	6,196	7,696
Deferred taxes	132,463	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	168,614	173,011
Purchase price in excess of predecessor basis, net of tax benefit of $10,306	(15,458)	(15,458)
Retained earnings	908,934	870,716
Accumulated other comprehensive loss	(190)	(194)
Treasury stock; at cost, 7,507,623 shares in 2018 and 7,777,722 shares in 2017	(251,260)	(258,622)
TOTAL STOCKHOLDERS' EQUITY	811,059	769,872
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,733,504	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