CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 151,739	$ 127,404
Accounts receivable trade, net	448,916	473,608
Accounts receivable other	2,786	4,331
Prepaid taxes	3,648	294
Prepaid expenses and other current assets	12,165	16,653
TOTAL CURRENT ASSETS	619,254	622,290
Restricted investments	23,285	20,877
Property and equipment, net	440,838	438,594
Other intangibles, net	11,196	11,844
Goodwill, net	262,266	262,376
Other assets	6,931	4,278
TOTAL ASSETS	1,363,770	1,360,259
CURRENT LIABILITIES:
Accounts payable trade	262,529	266,555
Accounts payable other	25,404	21,070
Accrued payroll	20,913	36,223
Accrued other	43,277	46,013
Current portion of capital lease	2,733	2,697
Current portion of long term debt	47,582	45,163
TOTAL CURRENT LIABILITIES	402,438	417,721
Long term debt	106,141	115,529
Non-current liabilities	24,807	23,595
Long term portion of capital lease	9,141	10,576
Deferred taxes	171,417	164,659
STOCKHOLDERS' EQUITY:
Preferred stock, $.01 par value; 2,000,000 shares authorized; no shares issued or outstanding in 2017 and 2016
Additional paid-in capital	168,443	173,565
Purchase price in excess of predecessor basis, net of tax benefit of $10,306	(15,458)	(15,458)
Retained earnings	755,439	735,563
Accumulated other comprehensive loss	(181)	(273)
Treasury stock; at cost, 7,790,882 shares in 2017 and 8,031,810 shares in 2016	(258,836)	(265,637)
TOTAL STOCKHOLDERS' EQUITY	649,826	628,179
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,363,770	1,360,259
Class A Common Stock [Member]
STOCKHOLDERS' EQUITY:
Common stock	412	412
Class B Common Stock [Member]
STOCKHOLDERS' EQUITY:
Common stock	$ 7	$ 7