CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 78,734	$ 90,679
Accounts receivable, net of allowance of $398 and $212 at June 30, 2018 and December 31, 2017, respectively	195,606	127,368
Drivers’ advances and other receivables	5,215	4,792
Current portion of net investment in sales-type leases	13,346	10,979
Parts supplies	5,040	4,653
Prepaid and other current assets	34,433	28,240
Total current assets	332,374	266,711
Property and equipment, net	501,120	429,639
Intangible assets, net	186,857	93,120
Goodwill	264,025	302,702
Other long-term assets	39,726	33,496
Total assets	1,324,102	1,125,668
Current liabilities:
Accounts payable	29,057	12,488
Accrued expenses and other liabilities	46,319	25,876
Accrued payroll, benefits and related taxes	16,330	14,004
Accrued insurance and claims	12,236	12,644
Current portion of long-term debt	48,022	43,056
Total current liabilities	151,964	108,068
Line of credit		4,561
Long-term debt, net of current portion	567,378	569,740
Deferred tax liabilities	121,513	90,434
Other long-term liabilities	20,985	1,632
Total liabilities	861,840	774,435
Commitments and contingencies (Note 15)
Stockholders’ equity:
Common stock, par value $0.0001 per share; 250,000,000 shares authorized, 63,875,267 and 48,712,288 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively	6	5
Additional paid-in-capital	427,892	277,931
Retained earnings (accumulated deficit)	(30,652)	7,338
Accumulated other comprehensive income	16	959
Total stockholders’ equity	462,262	351,233
Total liabilities and stockholders’ equity	1,324,102	1,125,668
Series A convertible preferred stock
Stockholders’ equity:
Preferred stock value	$ 65,000	$ 65,000

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.