Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 1,539	$ 124
Accounts receivable, less allowances of $3,222 in 2016 and $3,548 in 2015	135,083	124,222
Prepaid expenses and other	17,369	14,197
Income tax receivable	6,989	15,745
Other current assets	5,499	4,701
Total current assets	166,479	158,989
Property and Equipment, at cost	1,101,946	995,514
Less-accumulated depreciation	497,827	456,335
Net property and equipment	604,119	539,179
Goodwill	12,105	12,025
Identifiable Intangibles, net	13,293	14,961
Other Noncurrent Assets	4,374	4,039
Total assets	800,370	729,193
Current Liabilities:
Accounts payable	45,149	54,754
Wages, vacation and employees’ benefits	31,700	27,834
Claims and insurance accruals	33,047	26,903
Other current liabilities	18,286	19,457
Current portion of long-term debt	16,762	12,432
Total current liabilities	144,944	141,380
Other Liabilities:
Long-term debt, less current portion	57,042	56,540
Deferred income taxes	80,199	67,417
Claims, insurance and other	35,107	35,967
Total other liabilities	172,348	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, 25,322,701 and 25,141,799 shares issued and outstanding at December 31, 2016 and December 31, 2015, respectively	25	25
Additional paid-in-capital	237,846	230,593
Deferred compensation trust, 166,807 and 165,971 shares of common stock at cost at December 31, 2016 and December 31, 2015, respectively	(3,190)	(3,102)
Retained earnings	248,397	200,373
Total stockholders’ equity	483,078	427,889
Total liabilities and stockholders’ equity	$ 800,370	$ 729,193