CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Total revenue	$ 376,899	$ 197,323	$ 704,480	$ 357,757
Operating expenses:
Salaries, wages and employee benefits	90,614	58,186	172,959	108,307
Operations and maintenance	40,465	28,967	75,028	52,191
Communications	807	549	1,506	952
Administrative expenses	13,077	8,022	25,214	15,400
Sales and marketing	651	555	1,287	937
Insurance and claims	10,428	5,042	19,612	9,165
Acquisition-related transaction expenses	1,402	1,037	1,842	1,483
Depreciation and amortization	31,766	17,638	56,948	33,953
(Gain) loss on disposition of revenue property and equipment	(490)	26	(645)	(174)
Impairment	2,840		2,840
Total operating expenses	368,391	192,859	688,215	354,141
Income from operations	8,508	4,464	16,265	3,616
Other expense (income):
Interest income	(601)	(50)	(1,042)	(54)
Interest expense	11,070	6,544	21,407	12,440
Write-off of unamortized deferred financing fees				3,883
Other	(900)	(107)	(1,859)	(215)
Total other expense	9,569	6,387	18,506	16,054
Loss before provision (benefit) for income taxes	(1,061)	(1,923)	(2,241)	(12,438)
Provision (benefit) for income taxes	(14,546)	2,184	(14,929)	(586)
Net income (loss)	13,485	(4,107)	12,688	(11,852)
Other comprehensive income (loss):
Unrealized income on interest rate swaps				52
Foreign currency translation adjustments, net of tax expense (benefit) of $(78), $274, $(251) and $274, respectively	(623)	507	(943)	507
Comprehensive income (loss)	12,862	(3,600)	11,745	(11,293)
Net income (loss)	13,485	(4,107)	12,688	(11,852)
Convertible preferred stockholders dividend			(2,478)
Net income (loss) attributable to common stockholders	$ 12,246	$ (5,800)	$ 10,210	$ (14,352)
Net loss per common share:
Basic and Diluted (in dollars per share)	$ 0.20	$ (0.15)	$ 0.17	$ (0.44)
Weighted-average common shares outstanding:
Basic and Diluted (in shares)	60,558,956	37,945,310	57,935,688	32,468,674
Basic (in shares)	59,460	37,945	56,902	32,469
Diluted (in shares)	60,559	37,945	57,936	32,469
Series A
Other comprehensive income (loss):
Convertible preferred stockholders dividend	$ (1,239)	$ (1,693)	$ (2,478)	$ (1,694)
Weighted-average common shares outstanding:
Dividends declared per convertible preferred share	$ 1.91	$ 0.68	$ 3.81	$ 0.68
Series B
Other comprehensive income (loss):
Convertible preferred stockholders dividend				$ (806)
Weighted-average common shares outstanding:
Dividends declared per convertible preferred share				$ 12.50
Freight
Revenues:
Total revenue	$ 272,583	$ 149,654	$ 512,654	$ 275,209
Operating expenses:
Cost of revenue	141,582	49,760	259,305	87,346
Brokerage
Revenues:
Total revenue	60,091	28,656	106,229	49,525
Logistics
Revenues:
Total revenue	8,891	2,700	19,609	2,700
Fuel
Revenues:
Total revenue	35,334	16,313	65,988	30,323
Operating expenses:
Cost of revenue	31,359	20,466	64,735	39,689
Service
Operating expenses:
Taxes and licenses	$ 3,890	$ 2,611	$ 7,584	$ 4,892