Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current Assets:
Cash and cash equivalents	$ 46,909	$ 248
Accounts receivable, net	210,894	196,119
Income tax receivable	6,542	8,288
Prepaid expenses and other	41,563	27,724
Total current assets	305,908	232,379
Property and Equipment, at cost	1,834,768	1,739,222
Less: accumulated depreciation	712,882	686,623
Net property and equipment	1,121,886	1,052,599
Operating Lease Right-of-Use Assets	122,652	103,890
Goodwill and Identifiable Intangibles, net	21,193	21,484
Other Noncurrent Assets	5,620	5,341
Total assets	1,577,259	1,415,693
Current Liabilities:
Accounts payable	91,395	83,621
Wages, vacation and employees’ benefits	46,678	49,668
Claims and insurance accruals	37,696	36,888
Other current liabilities	35,024	32,644
Current portion of long-term debt	19,565	19,405
Current portion of operating lease liability	18,689	19,020
Total current liabilities	249,047	241,246
Other Liabilities:
Long-term debt, less current portion	216,202	117,025
Operating lease liability, less current portion	105,282	86,239
Deferred income taxes	118,624	111,555
Claims, insurance and other	44,717	44,402
Total other liabilities	484,825	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, 26,063,348 and 25,936,532 shares issued and outstanding at March 31, 2020 and December 31, 2019, respectively	26	26
Additional paid-in-capital	262,008	260,871
Deferred compensation trust, 156,897 and 143,987 shares of common stock at cost at March 31, 2020 and December 31, 2019, respectively	(4,958)	(3,871)
Retained earnings	586,311	558,200
Total stockholders’ equity	843,387	815,226
Total liabilities and stockholders’ equity	$ 1,577,259	$ 1,415,693