Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands		Mar. 31, 2019		Dec. 31, 2018
Current assets:
Cash and cash equivalents		$ 60,215		$ 82,486
Cash and cash equivalents – restricted	[1]	50,689		46,888
Restricted investments, held-to-maturity, amortized cost	[2]	11,640		17,413
Trade receivables, net of allowance for doubtful accounts of $17,872 and $16,355, respectively ¹	[3]	555,930		616,830
Prepaid expenses		74,707	[4]	67,011	[5]
Assets held for sale		32,332		39,955
Income tax receivable		1,399		6,943
Other current assets		26,550		29,706
Total current assets		813,462		907,232
Gross property and equipment		3,377,112		3,305,944
Less: accumulated depreciation and amortization		(753,389)		(693,107)
Property and equipment, net		2,623,723		2,612,837
Operating lease right-of-use assets		252,900	[6]	0	[7]
Goodwill		2,919,222		2,919,176
Intangible assets, net		1,410,227		1,420,919
Other long-term assets		61,608	[4]	51,721	[5]
Total assets		8,081,142		7,911,885
Current liabilities:
Accounts payable		158,646	[4]	117,883	[5]
Accrued payroll and purchased transportation		118,063		126,464
Accrued liabilities		167,813	[4]	151,500	[5]
Claims accruals – current portion		155,394		160,044
Finance lease liabilities and long-term debt – current portion		52,893		58,672
Operating lease liabilities – current portion		109,158	[6]	0	[7]
Total current liabilities		761,967		614,563
Revolving line of credit		60,000		195,000
Long-term debt – less current portion		364,649		364,590
Finance lease liabilities – less current portion		68,215		71,248
Operating lease liabilities – less current portion		151,634	[6]	0	[7]
Accounts receivable securitization		174,645		239,606
Claims accruals – less current portion		207,417		201,327
Deferred tax liabilities		730,516	[8]	739,538	[9]
Other long-term liabilities		17,476	[4]	23,294	[5]
Total liabilities		2,536,519		2,449,166
Commitments and contingencies (Notes 11 and 12)
Stockholders’ equity:
Preferred stock, par value $0.01 per share; 10,000 shares authorized; none issued		0		0
Common stock, par value $0.01 per share; 500,000 shares authorized; 173,066 and 172,844 shares issued and outstanding as of March 31, 2019 and December 31, 2018, respectively.		1,730		1,728
Additional paid-in capital		4,248,188		4,242,369
Retained earnings		1,292,838		1,216,852
Total Knight-Swift stockholders' equity		5,542,756		5,460,949
Noncontrolling interest		1,867		1,770
Total stockholders’ equity		5,544,623		5,462,719
Total liabilities and stockholders’ equity		8,081,142		7,911,885
Common Class A [Member]
Stockholders’ equity:
Total stockholders’ equity		$ 1,730		$ 1,728

[1] Reflects cash and cash equivalents that are primarily restricted for claims payments.

[2] Refer to Note 5 for discussion about the differences between the carrying amounts and estimated fair values of the Company's restricted investments, held-to-maturity.

[3] Includes in-transit revenue balances of $20.1 million and $15.6 million as of March 31, 2019 and December 31, 2018, respectively.

[4] Refer to tabular footnote (2) under "Adoption Date Impact" above.

[5] The effect of adopting ASC Topic 842 reflects certain reclassifications to adjust the right-of-use assets.

[6] Refer to tabular footnote (1) under "Adoption Date Impact" above.

[7] These new line items on the condensed consolidated balance sheets represent the capitalization of the Company's operating leases as lessee.

[8] Refer to tabular footnote (3) under "Adoption Date Impact" above.

[9] Amounts are reflective of deferred tax impacts from capitalizing the Company's operating leases