Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 3,560	$ 9,892
Customer receivables, net of allowance of $106 and $59 at June 30, 2019 and December 31, 2018, respectively	184,275	190,254
Other receivables	20,423	20,430
Prepaid insurance and licenses	10,420	11,035
Operating supplies	7,191	7,324
Assets held for sale	12,702	33,225
Other current assets	18,692	13,374
Total current assets	257,263	285,534
Property and equipment, at cost	939,619	898,530
Less accumulated depreciation and amortization	(392,420)	(379,813)
Net property and equipment	547,199	518,717
Other assets
Operating lease right of use assets	200,734
Goodwill	57,708	57,708
Intangible assets, net	28,065	28,913
Other	24,892	19,615
Total other assets	311,399	106,236
Total assets	1,115,861	910,487
Current liabilities
Accounts payable	61,289	63,808
Book overdraft	9,791
Accrued wages and benefits	22,412	24,960
Claims and insurance accruals, current	47,334	47,442
Other accrued liabilities	8,737	8,120
Liabilities associated with assets held for sale		6,856
Current portion of operating lease liabilities	58,162
Current maturities of long-term debt and finance leases	88,490	113,094
Total current liabilities	296,215	264,280
Long-term debt and finance leases, net of current maturities	352,010	312,819
Less debt issuance costs	(1,211)	(1,347)
Net long-term debt and finance leases	350,799	311,472
Deferred income taxes	21,802	19,978
Long-term liabilities associated with assets held for sale		8,353
Other long-term liabilities	6,828	7,713
Claims and insurance accruals, long-term	58,292	60,304
Noncurrent operating lease liabilities	142,356
Commitments and contingencies (Notes 7 and 8)
Stockholders' Equity
Additional paid-in capital	248,386	251,742
Accumulated deficit	(9,942)	(17,335)
Stockholders' Equity Attributable to Parent, Total	238,933	234,891
Noncontrolling interest	636	3,496
Total stockholders' equity	239,569	238,387
Total liabilities and stockholders' equity	1,115,861	910,487
Common Class A [Member]
Stockholders' Equity
Common stock	332	329
Common Class B [Member]
Stockholders' Equity
Common stock	$ 157	$ 155