CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 127,404	$ 207,749
Accounts receivable trade, net	473,608	379,987
Accounts receivable other	4,331	10,344
Prepaid taxes	294	362
Deferred taxes		8,412
Prepaid expenses and other current assets	16,653	17,756
TOTAL CURRENT ASSETS	622,290	624,610
Restricted investments	20,877	21,108
Property and equipment, net	438,594	374,847
Other intangibles, net	11,844	13,139
Goodwill, net	262,376	262,594
Other assets	4,278	4,848
TOTAL ASSETS	1,360,259	1,301,146
CURRENT LIABILITIES:
Accounts payable trade	266,555	230,432
Accounts payable other	21,070	21,495
Accrued payroll	36,223	33,020
Accrued other	46,013	38,733
Current portion of capital lease	2,697	2,608
Current portion of long-term debt	45,163	32,409
TOTAL CURRENT LIABILITIES	417,721	358,697
Long-term debt	115,529	100,895
Non-current liabilities	23,595	20,233
Long-term portion of capital lease	10,576	13,299
Deferred taxes	164,659	160,182
STOCKHOLDERS' EQUITY:
Preferred stock, $.01 par value; 2,000,000 shares authorized; no shares issued or outstanding in 2016 and 2015
Additional paid-in capital	173,565	174,285
Purchase price in excess of predecessor basis, net of tax benefit of $10,306	(15,458)	(15,458)
Retained earnings	735,563	660,758
Accumulated other comprehensive loss	(273)	(178)
Treasury stock; at cost, 8,031,810 shares in 2016 and 5,590,831 shares in 2015	(265,637)	(171,986)
TOTAL STOCKHOLDERS' EQUITY	628,179	647,840
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,360,259	1,301,146
Class A Common Stock [Member]
STOCKHOLDERS' EQUITY:
Common stock	412	412
Class B Common Stock [Member]
STOCKHOLDERS' EQUITY:
Common stock	$ 7	$ 7