Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 9,892	$ 9,232
Customer receivables, net of allowance of $59 and $122 at December 31, 2018 and 2017, respectively	190,254	186,407
Other receivables	20,430	21,637
Prepaid insurance and licenses	11,035	7,070
Operating supplies	7,324	8,787
Assets held for sale	33,225	3,417
Other current assets	13,374	12,170
Total current assets	285,534	248,720
Property and equipment, at cost	898,530	835,814
Less accumulated depreciation and amortization	(379,813)	(371,909)
Net property and equipment	518,717	463,905
Other assets
Goodwill	57,708	57,708
Intangible assets, net	28,913	30,742
Other	19,615	19,496
Total other assets	106,236	107,946
Total assets	910,487	820,571
Current liabilities
Accounts payable	63,808	80,555
Book overdraft		3,537
Accrued wages and benefits	24,960	20,530
Claims and insurance accruals, current	47,442	47,641
Other accrued liabilities	8,120	13,901
Total current liabilities associated with assets held for sale	6,856
Current maturities of long-term debt	113,094	132,332
Total current liabilities	264,280	298,496
Long-term debt, net of current maturities	312,819	480,472
Less unamortized discount and debt issuance costs	(1,347)	(7,266)
Net long-term debt	311,472	473,206
Deferred income taxes	19,978	15,630
Long-term liabilities associated with assets held for sale	8,353
Other long-term liabilities	7,713	14,350
Claims and insurance accruals, long-term	60,304	56,713
Commitments and contingencies (Notes 11 and 13)
Redeemable restricted units		3,281
Stockholders' Equity (Deficit)
Additional paid-in capital	251,742	1
Accumulated deficit	(17,335)	(43,459)
Stockholders' equity (deficit)	234,891	(43,394)
Noncontrolling interest	3,496	2,289
Total stockholders' equity (deficit)	238,387	(41,105)
Total liabilities, redeemable restricted units and stockholder's equity (deficit)	910,487	820,571
Common Class A [Member]
Stockholders' Equity (Deficit)
Common stock	329	64
Common Class B [Member]
Stockholders' Equity (Deficit)
Common stock	$ 155