Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current Assets:
Cash and cash equivalents	$ 29,280	$ 248
Accounts receivable, net	205,131	196,119
Income tax receivable	1,150	8,288
Prepaid expenses and other	34,082	27,724
Total current assets	269,643	232,379
Property and Equipment, at cost	1,862,048	1,739,222
Less: accumulated depreciation	743,345	686,623
Net property and equipment	1,118,703	1,052,599
Operating Lease Right-of-Use Assets	122,401	103,890
Goodwill and Identifiable Intangibles, net	20,902	21,484
Other Noncurrent Assets	6,551	5,341
Total assets	1,538,200	1,415,693
Current Liabilities:
Accounts payable	81,516	83,621
Wages, vacation and employees’ benefits	55,355	49,668
Claims and insurance accruals	39,627	36,888
Other current liabilities	32,953	32,644
Current portion of long-term debt	19,727	19,405
Current portion of operating lease liability	18,916	19,020
Total current liabilities	248,094	241,246
Other Liabilities:
Long-term debt, less current portion	141,112	117,025
Operating lease liability, less current portion	104,958	86,239
Deferred income taxes	119,125	111,555
Claims, insurance and other	49,821	44,402
Total other liabilities	415,016	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, 26,148,831 and 25,936,532 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively	26	26
Additional paid-in-capital	265,264	260,871
Deferred compensation trust, 154,977 and 143,987 shares of common stock at cost at June 30, 2020 and December 31, 2019, respectively	(4,965)	(3,871)
Retained earnings	614,765	558,200
Total stockholders’ equity	875,090	815,226
Total liabilities and stockholders’ equity	$ 1,538,200	$ 1,415,693