Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 15	$ 2,194
Accounts receivable, net	218,000	181,612
Prepaid expenses and other	31,694	29,567
Total current assets	249,709	213,373
Property and Equipment, at cost	1,735,019	1,521,341
Less-accumulated depreciation	693,895	628,283
Net property and equipment	1,041,124	893,058
Operating Lease Right-of-Use Assets	103,650
Goodwill and Identifiable Intangibles, net	21,775	22,664
Other Noncurrent Assets	6,014	4,648
Total assets	1,422,272	1,133,743
Current Liabilities:
Accounts payable	84,857	78,994
Wages, vacation and employees’ benefits	53,068	48,116
Claims and insurance accruals	35,770	40,980
Other current liabilities	32,837	23,138
Current portion of long-term debt	19,245	18,082
Current portion of operating lease liability	18,304
Total current liabilities	244,081	209,310
Other Liabilities:
Long-term debt, less current portion	146,020	104,777
Operating lease liability, less current portion	86,552
Deferred income taxes	108,711	86,893
Claims, insurance and other	44,537	36,899
Total other liabilities	385,820	228,569
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, 25,936,012 and 25,693,651 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	26	26
Additional paid-in-capital	259,388	254,738
Deferred compensation trust, 144,463 and 143,614 shares of common stock at cost at September 30, 2019 and December 31, 2018, respectively	(3,824)	(3,381)
Retained earnings	536,781	444,481
Total stockholders’ equity	792,371	695,864
Total liabilities and stockholders’ equity	$ 1,422,272	$ 1,133,743