Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 789	$ 124
Accounts receivable, net	143,461	124,222
Prepaid expenses and other	22,152	34,643
Total current assets	166,402	158,989
Property and Equipment, at cost	1,104,495	995,514
Less-accumulated depreciation	492,577	456,335
Net property and equipment	611,918	539,179
Goodwill and Identifiable Intangibles, net	25,815	26,986
Other Noncurrent Assets	4,477	4,039
Total assets	808,612	729,193
Current Liabilities:
Accounts payable	48,129	54,754
Wages, vacation and employees’ benefits	38,277	27,834
Other current liabilities	50,300	46,360
Current portion of long-term debt	16,695	12,432
Total current liabilities	153,401	141,380
Other Liabilities:
Long-term debt, less current portion	77,543	56,540
Deferred income taxes	74,091	67,417
Claims, insurance and other	34,687	35,967
Total other liabilities	186,321	159,924
Commitments and Contingencies
Stockholders’ Equity:
Preferred stock, $0.001 par value, 50,000 shares authorized, none issued and outstanding
Common stock, $0.001 par value, 50,000,000 shares authorized, 25,207,381 and 25,141,799 shares issued and outstanding at September 30, 2016 and December 31, 2015, respectively	25	25
Additional paid-in-capital	234,045	230,593
Deferred compensation trust, 168,827 and 165,971 shares of common stock at cost at September 30, 2016 and December 31, 2015, respectively	(3,229)	(3,102)
Retained earnings	238,049	200,373
Total stockholders’ equity	468,890	427,889
Total liabilities and stockholders’ equity	$ 808,612	$ 729,193