Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current Assets:
Cash and cash equivalents	$ 25,469	$ 248
Accounts receivable, net	226,677	196,119
Income tax receivable		8,288
Prepaid expenses and other	27,971	27,724
Total current assets	280,117	232,379
Property and Equipment, at cost	1,903,383	1,739,222
Less: accumulated depreciation	762,264	686,623
Net property and equipment	1,141,119	1,052,599
Operating Lease Right-of-Use Assets	117,487	103,890
Goodwill and Identifiable Intangibles, net	20,611	21,484
Other Noncurrent Assets	6,346	5,341
Total assets	1,565,680	1,415,693
Current Liabilities:
Accounts payable	97,060	83,621
Wages, vacation and employees’ benefits	54,947	49,668
Claims and insurance accruals	43,517	36,888
Other current liabilities	39,731	32,644
Current portion of long-term debt	20,735	19,405
Current portion of operating lease liability	19,701	19,020
Total current liabilities	275,691	241,246
Other Liabilities:
Long-term debt, less current portion	100,186	117,025
Operating lease liability, less current portion	99,474	86,239
Deferred income taxes	122,162	111,555
Claims, insurance and other	49,701	44,402
Total other liabilities	371,523	359,221
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, 26,156,220 and 25,936,532 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively	26	26
Additional paid-in-capital	267,075	260,871
Deferred compensation trust, 154,157 and 143,987 shares of common stock at cost at September 30, 2020 and December 31, 2019, respectively	(4,939)	(3,871)
Retained earnings	656,304	558,200
Total stockholders’ equity	918,466	815,226
Total liabilities and stockholders’ equity	$ 1,565,680	$ 1,415,693