Heartland Express (HTLD) 10-Q 12 Nov 19 2019 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Oct. 31, 2019
Document Information [Line Items]
Title of 12(b) Security	Common Stock, $0.01 par value
Entity Incorporation, State or Country Code	NV
Entity Registrant Name	HEARTLAND EXPRESS INC
City Area Code	319
Local Phone Number	626-3600
Entity Central Index Key	0000799233
Document Type	10-Q
Document Period End Date	Sep. 30, 2019
Entity File Number	0-15087
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		82,020,455
Entity Tax Identification Number	93-0926999
Entity Address, Address Line One	901 North Kansas Avenue,
Entity Address, City or Town	North Liberty,
Entity Address, State or Province	IA
Entity Address, Postal Zip Code	52317
Trading Symbol	HTLD
Security Exchange Name	NASDAQ
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Document Quarterly Report	true
Document Transition Report	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
CURRENT ASSETS
Cash and cash equivalents	$ 111,934	$ 161,448
Trade receivables, net of allowance of $1.0 million and $0.9 million	60,645	48,955
Prepaid tires	10,441	9,378
Other current assets	15,353	12,551
Income tax receivable	0	170
Total current assets	198,373	232,502
PROPERTY AND EQUIPMENT
Land and land improvements	59,561	46,095
Buildings	68,864	57,505
Leasehold improvements	437	437
Furniture and fixtures	3,997	3,057
Shop and service equipment	13,335	10,968
Revenue equipment	587,058	479,068
Construction in progress	4,376	6,540
Property, Plant and Equipment, Gross	737,628	603,670
Less accumulated depreciation	203,971	200,550
Property and equipment, net	533,657	403,120
GOODWILL	165,021	132,410
OTHER INTANGIBLES, NET	27,886	14,494
Deferred Income Taxes, Net	5,743	4,535
OTHER ASSETS	18,363	19,152
Assets	949,043	806,213
CURRENT LIABILITIES
Accounts payable and accrued liabilities	16,277	10,552
Compensation and benefits	24,357	22,558
Insurance accruals	21,441	22,130
Long-term Debt, Current Maturities	14,275	0
Other accruals	9,521	9,449
Accrued Income Taxes, Current	923	0
Total current liabilities	86,794	64,689
LONG-TERM LIABILITIES
Income taxes payable	5,745	5,577
Long-term Debt	39,186	0
Deferred income taxes, net	95,153	71,041
Insurance accruals less current portion	49,030	48,934
Total long-term liabilities	189,114	125,552
COMMITMENTS AND CONTINGENCIES (Note 16)
STOCKHOLDERS' EQUITY
Preferred stock, par value $.01; authorized 5,000 shares; none issued
Capital stock, common, $.01 par value; authorized 395,000 shares; issued 90,689 in 2019 and 2018; outstanding 82,016 in 2019 and 81,930 in 2018	907	907
Additional paid-in capital	3,945	3,454
Retained earnings	815,520	760,262
Treasury stock, at cost; 8,673 shares in 2019 and 8,759 in 2018	(147,237)	(148,651)
Stockholders' Equity Attributable to Parent	673,135	615,972
Liabilities and Stockholders' Equity	$ 949,043	$ 806,213

Consolidated Balance Sheets Con

Consolidated Balance Sheets Consolidated Balance Sheets (Parentheticals) - USD ($) shares in Thousands, $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Consolidated Balance Sheets Parentheticals [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	$ 1	$ 0.9
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	5,000	5,000
Preferred Stock, Shares Issued	0	0
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	395,000	395,000
Common Stock, Shares, Issued	90,689	90,689
Common Stock, Shares, Outstanding	82,016	81,930
Treasury Stock, Shares	8,673	8,759

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Operating Revenue	$ 147,908	$ 151,279	$ 429,589	$ 463,800
Operating Expenses
Salaries, wages, and benefits	60,909	55,126	168,137	174,694
Rent and purchased transportation	1,936	4,067	6,216	15,652
Fuel	25,211	27,460	71,730	85,340
Operating Costs and Expenses	6,260	6,469	17,730	20,970
Cost, Direct Tax and License	3,416	3,938	10,808	12,039
Insurance and claims	3,256	4,407	12,030	12,862
Communications and utilities	1,211	1,416	3,538	4,852
Depreciation and amortization	25,572	25,133	70,414	75,490
Other operating expenses	5,993	5,287	16,351	17,083
Gain on disposal of property and equipment	(12,595)	(7,156)	(23,978)	(15,410)
Total operating expenses	121,169	126,147	352,976	403,572
Operating income	26,739	25,132	76,613	60,228
Interest income	1,128	586	3,502	1,351
Interest Expense	(452)	0	(452)	0
Income before income taxes	27,415	25,718	79,663	61,579
Federal and state income taxes	6,914	6,662	19,483	11,342
Net income	20,501	19,056	60,180	50,237
Other comprehensive income, net of tax	0	0	0	0
Comprehensive income	$ 20,501	$ 19,056	$ 60,180	$ 50,237
Net income per share
Basic	$ 0.25	$ 0.23	$ 0.73	$ 0.61
Diluted	$ 0.25	$ 0.23	$ 0.73	$ 0.61
Weighted average shares outstanding
Basic	81,992	81,965	81,965	82,530
Diluted	82,040	81,992	82,008	82,564
Dividends declared per share	$ 0.02	$ 0.02	$ 0.06	$ 0.06

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Capital Stock, Common	Additional Paid-in Capital	Retained Earnings [Member]	Treasury Stock
Balance at Dec. 31, 2017	$ 574,645	$ 907	$ 3,518	$ 694,174	$ (123,954)
Net income	13,378	0	0	13,378	0
Dividends on common stock, $0.02 per share	(1,667)	0	0	(1,667)	0
Repurchases of common stock	(1,293)	0	0	0	(1,293)
Stock-based compensation, net of tax	26	0	(104)	0	130
Balance at Mar. 31, 2018	585,089	907	3,414	705,885	(125,117)
Balance at Dec. 31, 2017	574,645	907	3,518	694,174	(123,954)
Net income	50,237
Balance at Sep. 30, 2018	595,039	907	3,373	739,461	(148,702)
Balance at Mar. 31, 2018	585,089	907	3,414	705,885	(125,117)
Net income	17,803	0	0	17,803	0
Dividends on common stock, $0.02 per share	(1,643)	0	0	(1,643)	0
Repurchases of common stock	(19,629)	0	0	0	(19,629)
Stock-based compensation, net of tax	169	0	48	0	121
Balance at Jun. 30, 2018	581,789	907	3,462	722,045	(144,625)
Net income	19,056	0	0	19,056	0
Dividends on common stock, $0.02 per share	(1,640)	0	0	(1,640)	0
Repurchases of common stock	(4,164)	0	0	0	(4,164)
Stock-based compensation, net of tax	(2)	0	(89)	0	87
Balance at Sep. 30, 2018	595,039	907	3,373	739,461	(148,702)
Balance at Dec. 31, 2018	615,972	907	3,454	760,262	(148,651)
Net income	17,318	0	0	17,318	0
Dividends on common stock, $0.02 per share	(1,640)	0	0	(1,640)	0
Stock-based compensation, net of tax	177	0	(30)	0	207
Balance at Mar. 31, 2019	631,827	907	3,424	775,940	(148,444)
Balance at Dec. 31, 2018	615,972	907	3,454	760,262	(148,651)
Net income	60,180			60,180
Balance at Sep. 30, 2019	673,135	907	3,945	815,520	(147,237)
Balance at Mar. 31, 2019	631,827	907	3,424	775,940	(148,444)
Net income	22,361	0	0	22,361	0
Dividends on common stock, $0.02 per share	(1,640)	0	0	(1,640)	0
Stock-based compensation, net of tax	781	0	375	0	406
Balance at Jun. 30, 2019	653,329	907	3,799	796,661	(148,038)
Net income	20,501	0	0	20,501	0
Dividends on common stock, $0.02 per share	(1,642)	0	0	(1,642)	0
Proceeds from Issuance of Common Stock	750	0	113	0	637
Stock-based compensation, net of tax	197	0	33	0	164
Balance at Sep. 30, 2019	$ 673,135	$ 907	$ 3,945	$ 815,520	$ (147,237)

Consolidated Statement of Stock

Consolidated Statement of Stockholders' Equity Parentheticals - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Dividends declared per share	$ 0.02	$ 0.02	$ 0.06	$ 0.06

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
OPERATING ACTIVITIES
Net income	$ 20,501	$ 19,056	$ 60,180	$ 50,237
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization			71,001	76,086
Deferred income taxes			5,090	8,268
Stock-based compensation			1,570	374
Gain on disposal of property and equipment	(12,595)	(7,156)	(23,978)	(15,410)
Changes in certain working capital items:
Trade receivables			2,884	8,773
Prepaid expenses and other current assets			619	387
Accounts payable, accrued liabilities, and accrued expenses			(9,536)	(18,168)
Accrued income taxes			1,549	(1,900)
Net cash provided by operating activities			109,379	108,647
INVESTING ACTIVITIES
Proceeds from sale of property and equipment			66,350	84,910
Purchases of property and equipment, net of trades			(120,548)	(127,526)
Payments to Acquire Businesses, Net of Cash Acquired			(62,127)	0
Change in other assets			(10)	563
Net cash used in investing activities			(116,335)	(42,053)
FINANCING ACTIVITIES
Payments of cash dividends			(4,922)	(4,950)
Repayments of debt assumed			(39,887)	0
Shares withheld for employee taxes related to stock-based compensation			(415)	(181)
Repurchases of common stock			0	(25,086)
Net cash used in financing activities			(45,224)	(30,217)
Net (decrease) increase in cash, cash equivalents and restricted cash			(52,180)	36,377
CASH, CASH EQUIVALENTS AND RESTRICTED CASH
Beginning of period			182,938	106,098
Ending Period	130,758	142,475	130,758	142,475
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid during the period for income taxes, net of refunds			12,844	4,974
Interest Paid, Excluding Capitalized Interest, Operating Activities			335	0
Noncash investing and financing activities:
Purchased property and equipment in accounts payable			5,562	16,977
Sold revenue equipment in other current assets			6,765	15,900
RECONCILIATION OF CASH, CASH EQUIVALENTS AND RESTRICTED CASH
Cash and Cash Equivalents, at Carrying Value	111,934	120,000	111,934	120,000
Restricted Cash and Investments, Current	2,040	3,298	2,040	3,298
Restricted Cash and Cash Equivalents, Noncurrent	16,784	19,177	16,784	19,177
Ending Period	$ 130,758	$ 142,475	$ 130,758	$ 142,475

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2019
Basis of Presentation and Accounting Pronouncements [Abstract]
Basis of Presentation and Significant Accounting Policies [Text Block]	Basis of Presentation and New Accounting Pronouncements Heartland Express, Inc. is a holding company incorporated in Nevada, which owns all of the stock of Heartland Express, Inc. of Iowa, Heartland Express Services, Inc., and Heartland Express Maintenance Services, Inc. Effective December 31, 2018, A & M Express, Inc. was merged into Heartland Express, Inc. of Iowa. On August 26, 2019, Heartland Express, Inc. of Iowa acquired Midwest Holding Group, Inc. and Millis Real Estate Leasing, LLC (together, "Millis Transfer"), a truckload carrier headquartered in Black River Falls, Wisconsin. As such, Millis Transfer is a wholly owned subsidiary as of September 30, 2019 . We, together with our subsidiaries, are a short-to-medium haul truckload carrier (predominately 500 miles or less per load). We primarily provide nationwide asset-based dry van truckload service for major shippers from Washington to Florida and New England to California. The accompanying consolidated financial statements include the parent company, Heartland Express, Inc., and its subsidiaries, all of which are wholly owned. The consolidated financial results for the three and nine months ended September 30, 2019 , include the results of Millis Transfer from the date of acquisition, August 26, 2019, through September 30, 2019 . All material intercompany items and transactions have been eliminated in consolidation. The accompanying unaudited consolidated financial statements of the Company have been prepared in accordance with U.S. generally accepted accounting principles ("GAAP") for interim financial information and with the instructions to Form 10-Q and Regulation S-X. Accordingly, they do not include all of the information and notes to the financial statements required by U.S. GAAP for complete financial statements. In the opinion of management, all normal, recurring adjustments considered necessary for a fair presentation have been included. The consolidated financial statements should be read in conjunction with the audited consolidated financial statements and accompanying notes for the year ended December 31, 2018 included in the Annual Report on Form 10-K of the Company filed with the Securities and Exchange Commission (the "SEC") on February 21, 2019. Interim results of operations are not necessarily indicative of the results to be expected for the full year or any other interim periods. There were no changes to the Company's significant accounting policies during the nine month period ended September 30, 2019 . In August 2018, the SEC adopted the final rule under SEC Release No. 33-10532, "Disclosure Update and Simplification", streamlining certain disclosure requirements to reduce redundant, duplicative, or outdated disclosures. In addition, the amendments expand disclosures related to interim-period changes in stockholders’ equity and noncontrolling interests. Management has adopted and presented the expanded disclosures related to interim-period changes in stockholders' equity beginning with the first quarter ended March 31, 2019 and interim periods from that point, along with the respective comparable periods. In January 2017, the Financial Accounting Standards Board ("FASB") issued ASU 2017-04, “Simplifying the Test for Goodwill Impairment,” which continues to require an entity to review goodwill for potential impairment, but eliminates or replaces additional tests and assessments within the prior guidance. The provisions of this update are effective for fiscal years beginning after December 15, 2019, with early adoption permitted for impairment measurement tests occurring after January 1, 2017. We have adopted the provisions of the standard as part of our 2019 annual impairment test completed in September 2019 and have determined that this change did not materially impact our 2019 assessment. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments". This update requires measurement and recognition of expected versus incurred credit losses for financial assets held. ASU 2016-13 is effective for annual periods beginning after December 15, 2019, and interim periods therein. Based on our initial assessment, we believe the impact of adoption of the standard will not have a material impact on our financial statements when adopted in 2020. In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)". This update seeks to increase the transparency and comparability among entities by requiring public entities to recognize lease assets and lease liabilities on the balance sheet and disclose key information about leasing arrangements. To satisfy the standard’s objective, a lessee will recognize a right-of-use asset representing its right to use the underlying asset for the lease term and a lease liability for the obligation to make lease payments. Both the right-of-use asset and lease liability will initially be measured at the present value of the lease payments, with subsequent measurement dependent on the classification of the lease as either a finance or an operating lease. For leases with a term of twelve months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. If a lessee makes this election, it should recognize lease expense for such leases generally on a straight-line basis over the lease term.

Use of Estimates

Use of Estimates	9 Months Ended
	Sep. 30, 2019
Use of Estimates [Abstract]
Use of Estimates	Use of Estimates The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. There were no significant changes in estimates and assumptions used by management related to our critical accounting policies during the three and nine months ended September 30, 2019 .

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
Segment Information	Segment Information We provide truckload services across the United States (U.S.) and parts of Canada. These truckload services are primarily asset-based transportation services in the dry van truckload market. We also offer truckload temperature-controlled transportation services, although not significant to our operations. Millis Transfer is an asset based transportation company in the dry van truckload market. Our Chief Operating Decision Maker oversees and manages all of our transportation services, on a combined basis, including previously acquired entities. As a result of the foregoing, we have determined that we have one

Revenue Recognition (Notes)

Revenue Recognition (Notes)	9 Months Ended
	Sep. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Text Block]	Revenue Recognition The Company recognizes revenue over time as control of the promised services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those services. The delivery of the shipment and completion of the performance obligation allows for the collection of payment generally within 30 days after the delivery date of the shipment for the majority of our customers. The Company's operations are consistent with those in the trucking industry where freight is hauled twenty-four hours a day and seven days a week, subject to hours of service rules. The Company’s average length of haul is 400-500 miles per trip and each individual shipment accepted by the Company is considered a separate contract with the performance obligation being the delivery of the freight. Our average length of haul for each load of freight generally equals less than one day of continuous transit time. The Company estimates revenue for multiple-stop loads based on miles run and estimates revenue for single stop loads based on transit time, as the customer simultaneously receives and consumes the benefit provided. The Company hauls freight and earns revenue on a consistent basis throughout the periods presented. A corresponding contract asset existed for the estimated revenue of these in-process loads for $1.2 million and $1.1 million at September 30, 2019 and December 31, 2018 , respectively. Recorded contract assets are included in the accounts receivable line item of the balance sheet. Corresponding liabilities are recorded in the accounts payable and accrued liabilities and compensation and benefits line items for the estimated expenses on these same in-process loads. The Company had no contract liabilities associated with our operations as of September 30, 2019 . Total revenues recorded were $147.9 million and $151.3 million for the three months ended September 30, 2019 and 2018 , respectively. Fuel surcharge revenues were $18.4 million and $21.4 million for the three months ended September 30, 2019 and 2018 , respectively. Accessorial and other revenues recorded in the consolidated statements of comprehensive income collectively represented $4.0 million and $3.2 million for the three months ended September 30, 2019 and 2018 , respectively. Total revenues recorded were $429.6 million and $463.8 million for the nine months ended September 30, 2019 and 2018 , respectively. Fuel surcharge revenues were $53.5 million and $65.3 million for the nine months ended September 30, 2019 and 2018 , respectively. Accessorial and other revenues recorded in the consolidated statements of comprehensive income collectively represented $9.6 million and $11.1 million for the nine months ended September 30, 2019 and 2018 , respectively.

Cash and Cash Equivalents

Cash and Cash Equivalents	9 Months Ended
	Sep. 30, 2019
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and Cash Equivalents Cash equivalents are short-term, highly liquid investments with insignificant interest rate risk and original maturities of three months or less at acquisition. At September 30, 2019 , restricted and designated cash and investments totaled $18.8 million , of which $2.0 million was included in other current assets and $16.8 million was included in other non-current assets in the consolidated balance sheet. Restricted and designated cash and investments totaled $21.5 million at December 31, 2018 , of which $3.1 million was included in other current assets and $18.4 million was included in other non-current assets in the consolidated balance sheet. The restricted funds represent deposits required by state agencies for self-insurance purposes and designated funds that are earmarked for a specific purpose and not for general business use.

Millis Transfer Acquistion (Not

Millis Transfer Acquistion (Notes)	Aug. 26, 2019
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	Note 6. Acquisition of Millis Transfer On August 26, 2019, Heartland Express, Inc. of Iowa (the “Buyer”) and Heartland Express, Inc., as guarantor, entered into an Acquisition and Merger Agreement with Midwest Holding Group, Inc. and Millis Real Estate Leasing, LLC (together, "Millis Transfer"). Millis Transfer is a truckload carrier headquartered in Black River Falls, Wisconsin, providing asset-based dry van truckload transportation services, including local, regional, and dedicated services. Pursuant to the Acquisition and Merger Agreement, the Buyer acquired all of Millis Transfer’s outstanding equity (the “Transaction”). The Buyer paid $156.2 million of total consideration, including cash, restricted shares of the Company's common stock, and assumed indebtedness of Millis Transfer. Total cash paid and common stock issued of $62.9 million was funded out of the Company’s available cash and restricted shares of the Company's common stock issued from treasury stock. The transaction included the assumption of $93.3 million of Millis Transfer's indebtedness of which $53.5 million was outstanding at September 30, 2019 . Heartland expects to pay off the remaining debt by December 31, 2019. The Acquisition and Merger Agreement contains customary representations, warranties, covenants, escrow, and indemnification provisions. The results of the acquired business have been included in the consolidated financial statements since the date of acquisition and represented 19.6% of consolidated total assets as of September 30, 2019 , and represented 10.6% and 3.6% of operating revenue for the three and nine months ended September 30, 2019 , respectively. Acquisition related expenses of $0.4 million and $0.5 million are included in the consolidated statement of comprehensive income for the three and nine months ended September 30, 2019 , respectively. The allocation of the purchase price is detailed in the tables below. The final purchase price allocation remains subject to other purchase accounting adjustments which may be identified, such as the final valuation of intangible assets, working capital adjustments, and income taxes, and therefore may differ materially from that reflected below. The goodwill recognized represents expected synergies from combining the operations of the Company with Millis Transfer, as well as other intangible assets that did not meet the criteria for separate recognition. Goodwill and intangible assets recognized in the transaction are not deductible for tax purposes. The assets and liabilities associated with Millis Transfer were recorded at their fair values as of the acquisition date and the amounts are as follows: (in thousands) Trade and other accounts receivable $ 14,574 Other current assets 1,696 Property and equipment 121,151 Other non-current assets 802 Intangible assets 15,300 Goodwill 32,611 Total assets 186,134 Accounts payable, accrued expenses, and current portion of long-term debt (30,381 ) Insurance accruals (4,871 ) Long-term debt (70,191 ) Deferred taxes (17,814 ) Total cash paid and common stock issued $ 62,877 TOTAL PURCHASE PRICE CONSIDERATION (in thousands) Cash paid pursuant to the Acquisition and Merger Agreement $ 62,127 Common stock issued pursuant to the Acquisition and Merger Agreement 750 Total cash paid and common stock issued $ 62,877

Prepaid Tires, Property, Equipm

Prepaid Tires, Property, Equipment and Depreciation	9 Months Ended
	Sep. 30, 2019
Property, Plant and Depreciation [Abstract]
Property, Equipment, and Depreciation	Prepaid Tires, Property, Equipment, and Depreciation Property and equipment are reported at cost, net of accumulated depreciation. Maintenance and repairs are charged to operations as incurred. New tires are capitalized separately from revenue equipment and are reported separately as “Prepaid tires” in the consolidated balance sheets and amortized over two years . Depreciation for financial statement purposes is computed by the straight-line method for all assets other than tractors. We recognize depreciation expense on new tractors using the 125% declining balance method. New tractors are depreciated to salvage values of $15,000 while new trailers are depreciated to salvage values of $4,000 . At September 30, 2019 , there was $6.8 million of amounts receivable related to equipment sales which was recorded in other current assets compared to $3.8 million at December 31, 2018.

Other Intangible, Net and Goodw

Other Intangible, Net and Goodwill	9 Months Ended
	Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets and Goodwill	Other Intangibles, Net and Goodwill All intangible assets determined to have finite lives are amortized over their estimated useful lives. The useful life of an intangible asset is the period over which the asset is expected to contribute directly or indirectly to future cash flows. There was a $15.3 million change in the gross amount of identifiable intangible assets during the three and nine months ended September 30, 2019 , related to the acquisition of Millis Transfer. Amortization expense of $0.7 million and $0.6 million for the three months ended September 30, 2019 and 2018, respectively, was included in depreciation and amortization in the consolidated statements of comprehensive income. Amortization expense of $1.9 million and $1.9 million for the nine months ended September 30, 2019 and 2018, respectively, was included in depreciation and amortization in the consolidated statements of comprehensive income. Intangible assets subject to amortization consisted of the following at September 30, 2019 : Amortization period (years) Gross Amount Accumulated Amortization Net intangible assets (in thousands) Customer relationships 15-20 $ 23,000 $ 2,894 $ 20,106 Tradename 0.5-10 12,900 7,986 4,914 Covenants not to compete 1-10 5,300 2,434 2,866 $ 41,200 $ 13,314 $ 27,886 Changes in carrying amount of goodwill were as follows: (in thousands) Balance at December 31, 2018 $ 132,410 Acquisition 32,611 Balance at September 30, 2019 $ 165,021

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Earnings Per Share	Earnings per Share Basic earnings per share is based upon the weighted average common shares outstanding during each year. Diluted earnings per share is based on the basic weighted earnings per share with additional weighted common shares for common stock equivalents. During the three and nine months ended September 30, 2019 and September 30, 2018 , we had outstanding restricted shares of common stock to certain of our employees under the Company's 2011 Restricted Stock Award Plan (the "Plan"). A reconciliation of the numerator (net income) and denominator (weighted average number of shares outstanding of the basic and diluted earnings per share ("EPS")) for the three and nine months ended September 30, 2019 and September 30, 2018 is as follows (in thousands, except per share data): Three months ended September 30, 2019 Net Income (numerator) Shares (denominator) Per Share Amount Basic EPS $ 20,501 81,992 $ 0.25 Effect of restricted stock — 48 Diluted EPS $ 20,501 82,040 $ 0.25 Three months ended September 30, 2018 Net Income (numerator) Shares (denominator) Per Share Amount Basic EPS $ 19,056 81,965 $ 0.23 Effect of restricted stock — 27 Diluted EPS $ 19,056 81,992 $ 0.23 Nine months ended September 30, 2019 Net Income (numerator) Shares (denominator) Per Share Amount Basic EPS $ 60,180 81,965 $ 0.73 Effect of restricted stock — 43 Diluted EPS $ 60,180 82,008 $ 0.73 Nine months ended September 30, 2018 Net Income (numerator) Shares (denominator) Per Share Amount Basic EPS $ 50,237 82,530 $ 0.61 Effect of restricted stock — 34 Diluted EPS $ 50,237 82,564 $ 0.61

Equity

Equity	9 Months Ended
	Sep. 30, 2019
Share Repurchases [Abstract]
Stockholders' Equity	Equity We have a stock repurchase program with 6.9 million shares remaining authorized for repurchase as of September 30, 2019 . There were no shares repurchased in the open market during the three and nine months ended September 30, 2019 and there were 0.2 million and 1.4 million shares repurchased during the three and nine months ended September 30, 2018. Repurchases are expected to continue from time to time, as determined by market conditions, cash flow requirements, securities law limitations, and other factors, until the number of shares authorized have been repurchased, or until the authorization is terminated. The share repurchase authorization is discretionary and has no expiration date. During the three months ended September 30, 2019 and 2018 , our Board of Directors declared regular quarterly dividends totaling $1.6 million and $1.6 million , respectively. During the nine months ended September 30, 2019 and 2018 , our Board of Directors declared regular quarterly dividends totaling $4.9 million and $5.0 million , respectively. Future payment of cash dividends and the amount of such dividends will depend upon our financial conditions, our results of operations, our cash requirements, our tax treatment, and certain corporate law requirements, as well as factors deemed relevant by our Board of Directors.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2019
Stock-Based Compensation [Abstract]
Stock Based Compensation	Stock-Based Compensation In July 2011, a Special Meeting of Stockholders of Heartland Express, Inc. was held, at which meeting the approval of the Heartland Express, Inc. 2011 Restricted Stock Award Plan (the "Plan") was ratified. The Plan made available up to 0.9 million shares for the purpose of making restricted stock grants to our eligible officers and employees. Shares granted in 2016 through 2019 have various vesting terms that range from immediate to four years from the date of grant. Compensation expense associated with these awards is based on the market value of our stock on the grant date. Compensation expense associated with restricted stock awards is included in salaries, wages and benefits in the consolidated statements of comprehensive income. There were no significant assumptions made in determining fair value. Compensation expense associated with restricted stock awards was $0.3 million and $1.6 million respectively, for the three and nine months ended September 30, 2019 . Compensation expense associated with restricted stock awards was $0.1 million and $0.4 million respectively, for the three and nine months ended September 30, 2018. Unrecognized compensation expense was $0.4 million at September 30, 2019 which will be recognized over a weighted average period of 0.7 years. The following tables summarize our restricted stock award activity for the three and nine months ended September 30, 2019 and 2018 . Three Months Ended September 30, 2019 Number of Shares of Restricted Stock Awards (in thousands) Weighted Average Grant Date Fair Value Unvested at beginning of period 58.5 $ 19.83 Granted 5.0 20.38 Vested (15.2 ) 18.60 Forfeited — — Outstanding (unvested) at end of period 48.3 $ 20.28 Three Months Ended September 30, 2018 Number of Shares of Restricted Stock Awards (in thousands) Weighted Average Grant Date Fair Value Unvested at beginning of period 35.0 $ 20.29 Granted — — Vested (8.5 ) 17.11 Forfeited — — Outstanding (unvested) at end of period 26.5 $ 21.31 Nine Months Ended September 30, 2019 Number of Shares of Restricted Stock Awards (in thousands) Weighted Average Grant Date Fair Value Unvested at beginning of period 26.5 $ 21.31 Granted 92.5 19.47 Vested (70.2 ) 19.63 Forfeited (0.5 ) 17.11 Outstanding (unvested) at end of period 48.3 $ 20.28 Nine Months Ended September 30, 2018 Number of Shares of Restricted Stock Awards (in thousands) Weighted Average Grant Date Fair Value Unvested at beginning of period 53.7 $ 21.82 Granted 5.0 19.03 Vested (30.7 ) 22.03 Forfeited (1.5 ) 17.11 Outstanding (unvested) at end of period 26.5 $ 21.31

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2019
Long-term Line of Credit [Abstract]
Long-Term Debt	Long-Term Debt In November 2013, Heartland Express, Inc. of Iowa, (the "Borrower"), a wholly owned subsidiary of the Company, entered into a Credit Agreement with Wells Fargo Bank, National Association, (the “Bank”). Pursuant to the Credit Agreement, the Bank provided a five-year, $250.0 million unsecured revolving line of credit which may be used for future working capital, equipment financing, and general corporate purposes. The Bank's original commitment decreased to $175.0 million on November 1, 2016 through scheduled maturity on October 31, 2018. However, on August 31, 2018, Borrower and the Bank entered into the First Amendment to this Credit Agreement. The First Amendment (i) provides for a $100.0 million unsecured revolving line of credit (the “Revolver”), which may be used for working capital, equipment financing, permitted acquisitions, and general corporate purposes, (ii) provides an uncommitted accordion feature, which allows the Company a one-time request, at the discretion of the Bank, to increase the Revolver by up to an additional $100.0 million , (iii) increases the letter of credit subfeature of the Credit Agreement from $20.0 million to $30.0 million , and (iv) extends the maturity of the Credit Agreement to August 31, 2021, subject to the Borrower’s ability to terminate the commitment at any time at no additional cost to the Borrower. The Credit Agreement is unsecured, with a negative pledge against all assets of our consolidated group, except for debt associated with permitted acquisitions, new purchase-money debt and capital lease obligations as described in the Credit Agreement. Borrowings under the Credit Agreement can either be, at Borrower's election, (i) one-month or three-month LIBOR (Index) plus a spread between 0.700% and 0.900% , based on the Company's consolidated funded debt to adjusted EBITDA ratio or (ii) Prime (Index) plus 0.0% . There is a commitment fee on the unused portion of the Revolver between 0.0725% and 0.1750% , based on the Company's consolidated funded debt to adjusted EBITDA ratio. The Credit Agreement contains customary financial covenants including, but not limited to, (i) a maximum adjusted leverage ratio of 2 :1, measured quarterly on a trailing twelve month basis, (ii) a minimum net income requirement of $1.00 , measured quarterly on a trailing twelve month basis, (iii) a minimum tangible net worth of $250.0 million requirement, measured quarterly, and (iv) limitations on other indebtedness and liens. The Credit Agreement also includes customary events of default, conditions, representations and warranties, and indemnification provisions. We were in compliance with the respective financial covenants at September 30, 2019 and during the nine months then ended. We assumed $93.3 million of revenue equipment debt related to the Millis Transfer acquisition on August 26, 2019, and as a result had $53.5 million outstanding debt at September 30, 2019 as compared to $0.0 million at December 31, 2018 . The remaining assumed debt at September 30, 2019 has monthly installment payments and annual interest rates between 3.13% to 5.17% , and original maturities between 36 months and 84 months. The outstanding debt is secured by the underlying revenue equipment assets. We expect to fully retire the outstanding debt acquired from Millis Transfer before December 31, 2019. Outstanding letters of credit associated with the revolving line of credit at September 30, 2019 were $11.3 million . As of September 30, 2019 , the line of credit available for future borrowing was $88.7 million

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We use the asset and liability method of accounting for income taxes. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to temporary differences between the financial statement carrying amount of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. Such amounts are adjusted, as appropriate, to reflect changes in tax rates expected to be in effect when temporary differences reverse. The effect of changes in tax rates on deferred taxes is recognized in the period that the change is enacted. A valuation allowance is recorded to reduce the Company's deferred tax assets to the amount that is more likely than not to be realized. We had no recorded valuation allowance at September 30, 2019 and December 31, 2018 . Our effective tax rate was 25.2% and 25.9% for the three months ended September 30, 2019 and 2018 , respectively. Our effective tax rate was 24.5% and 18.4% for the nine months ended September 30, 2019 and 2018 , respectively. The changes in the effective tax rate are driven by less favorable provision to income tax return adjustments and a reduced value of uncertain tax positions reaching the statute of limitations. We recognize the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. We record interest and penalties related to unrecognized tax benefits in income tax expense. At September 30, 2019 and December 31, 2018 , we had a total of $4.8 million and $4.6 million in gross unrecognized tax benefits, respectively included in long-term income taxes payable in the consolidated balance sheet. Of this amount, $3.8 million and $3.6 million represents the amount of unrecognized tax benefits that, if recognized, would impact our effective tax rate as of September 30, 2019 and December 31, 2018 . The net decrease in unrecognized tax benefits was $0.1 million during the three months ended September 30, 2019 . The net increase in unrecognized tax benefits was $0.3 million during the three months ended September 30, 2018. The net increase in unrecognized tax benefits was $0.3 million and a decrease of $1.6 million during the nine months ended September 30, 2019 and 2018 , respectively. The net decrease during the three months ended September 30, 2019 , was mainly due to favorable audit findings offsetting current year accruals for uncertain liabilities. The increase in the three months ended September 30, 2018 was due to the unrecognized tax benefits resulting from 2018 tax year positions. The net increase in the nine months ended September 30, 2019 and decrease during the same period of 2018 was the net impact of unrecognized tax benefits resulting from accruals for current year tax positions offset by favorable settlements and reductions due to lapse of statutes of limitations. These changes had the corresponding increasing or decreasing impact on the effective state tax rate during these same periods. The total net amount of accrued interest and penalties for such unrecognized tax benefits was $0.9 million and $1.0 million at September 30, 2019 and December 31, 2018 and is included in long-term income taxes payable in the consolidated balance sheets. Income tax expense is increased each period for the accrual of interest on outstanding positions and penalties when the uncertain tax position is initially recorded. Income tax expense is reduced in periods by the amount of accrued interest and penalties associated with reversed uncertain tax positions due to lapse of applicable statute of limitations, when applicable or when a position is settled. Net interest and penalties included in income tax expense for the three month period ended September 30, 2019 and 2018 was a net expense of approximately $0.1 million and $0.1 million , respectively. Net interest and penalties included in income tax expense for the nine month period ended September 30, 2019 and 2018 was a net benefit of approximately $0.1 million and $1.4 million , respectively. There was a favorable impact to income tax expense during the three and nine months ended September 30, 2019 and 2018 due to reversals of interest and penalties due to lapse of applicable statute of limitations and settlements, net of additions for interest and penalty accruals during the same period. These unrecognized tax benefits relate to risks associated with state income tax filing positions for our corporate subsidiaries. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: 2019 (in thousands) Balance at January 1, 2019 $ 4,585 Additions based on tax positions related to current year 1,212 Additions for tax positions of prior years 124 Reductions for tax positions of prior years (140 ) Reductions due to lapse of applicable statute of limitations (867 ) Settlements (76 ) Balance at September 30, 2019 $ 4,838 A number of years may elapse before an uncertain tax position is audited and ultimately settled. It is difficult to predict the ultimate outcome or the timing of resolution for uncertain tax positions. It is reasonably possible that the amount of unrecognized tax benefits could significantly increase or decrease within the next twelve months. These changes could result from the expiration of the statute of limitations, examinations or other unforeseen circumstances. We do not have any outstanding litigation related to income tax matters. At this time, management’s best estimate of the reasonably possible change in the amount of gross unrecognized tax benefits is an increase of $0.2 million up to an increase of $1.2 million during the next twelve months mainly due to the additions for certain tax positions, net of the expiration of certain statute of limitations. The federal statute of limitations remains open for the years 2016 and forward. Tax years 2009 and forward are subject to audit by state tax authorities depending on the tax code and administrative practice of each state.

Operating Leases

Operating Leases	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Operating Leases	Operating Leases Rent expense for operating leases for revenue equipment that resulted from our prior IDC acquisition was $0.0 million and $0.3 million for the three and nine months ended September 30, 2019 and $0.9 million and $4.5 million for the three and nine months ended September 30, 2018 , respectively. These operating leases terminated March 31, 2019. These expenses were included in rent and purchased transportation in the consolidated statements of comprehensive income. We currently lease certain terminal facilities under operating leases and we expect these current leases to expire in 2019 and 2020. One of these leases contains a purchase option which we have exercised and expect to close on the purchase during the fourth quarter of 2019. We are responsible for all taxes, insurance, and utilities related to the terminal leases. Rent expenses for terminal facilities were $0.6 million and $2.0 million (including related-party rental payments totaling $0.0 million and $0.0 million ), for the three and nine months ended September 30, 2019 . Rent expenses for terminal facilities were $1.2 million and $3.8 million (including related-party rental payments totaling $0.3 million and $0.7 million ), for the three and nine months ended September 30, 2018 . Historically, a portion of these leases were with limited liability companies, whose members include one of our board members and a commercial tractor dealership whose owners include one of our board members. The related-party rental payments were entered into as a result of a previous acquisition, although these leases ended in November, 2018. All operating lease expense is included in rent and purchased transportation in the consolidated statements of comprehensive income. See Note 15 for additional information regarding related party transactions.

Related Party

Related Party	9 Months Ended
	Sep. 30, 2019
Related Party [Abstract]
Related Party	Related Party We historically leased certain terminal facilities for operations under operating leases from certain limited liability companies, whose members include one of our board members and a commercial tractor dealership whose owners included one of our board members until the leases ended in November, 2018. We purchased parts and services from the commercial tractor dealership noted above. We owed the commercial tractor dealership $0.0 million and $0.1 million , included in accounts payable and accrued liabilities in the consolidated balance sheets at September 30, 2019 and December 31, 2018 , respectively. The payments with related parties for the three and nine months ended September 30, 2019 and 2018 (in thousands) were as follows: Three months ended September 30, 2019 2018 Payments for parts and services $ 30 $ 65 Terminal lease payments — 251 $ 30 $ 316 Nine months ended September 30, 2019 2018 Payments for parts and services $ 255 $ 346 Terminal lease payments — 712 $ 255 $ 1,058

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies We are a party to ordinary, routine litigation and administrative proceedings incidental to our business. In the opinion of management, our potential exposure under pending legal proceedings is adequately provided for in the accompanying consolidated financial statements. The total estimated purchase commitments for tractors (net of tractor sale commitments), trailer equipment, and exercised terminal purchase option as of September 30, 2019 was $82.2 million . These commitments extend through the remainder of 2019 and into 2021.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2019
Subsequent Events [Abstract]
Subsequent Events, Policy [Policy Text Block]	Subsequent Events Subsequent to September 30, 2019, we paid an additional $32.4 million to retire the revenue equipment debt acquired through the acquisition of Millis Transfer, resulting in $21.1 million acquired debt outstanding.

Basis of Presentation Basis of

Basis of Presentation Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2019
Basis of Presentation [Abstract]
Basis of Presentation [Policy Text Block]	Basis of Presentation and New Accounting Pronouncements Heartland Express, Inc. is a holding company incorporated in Nevada, which owns all of the stock of Heartland Express, Inc. of Iowa, Heartland Express Services, Inc., and Heartland Express Maintenance Services, Inc. Effective December 31, 2018, A & M Express, Inc. was merged into Heartland Express, Inc. of Iowa. On August 26, 2019, Heartland Express, Inc. of Iowa acquired Midwest Holding Group, Inc. and Millis Real Estate Leasing, LLC (together, "Millis Transfer"), a truckload carrier headquartered in Black River Falls, Wisconsin. As such, Millis Transfer is a wholly owned subsidiary as of September 30, 2019 . We, together with our subsidiaries, are a short-to-medium haul truckload carrier (predominately 500 miles or less per load). We primarily provide nationwide asset-based dry van truckload service for major shippers from Washington to Florida and New England to California. The accompanying consolidated financial statements include the parent company, Heartland Express, Inc., and its subsidiaries, all of which are wholly owned. The consolidated financial results for the three and nine months ended September 30, 2019 , include the results of Millis Transfer from the date of acquisition, August 26, 2019, through September 30, 2019 . All material intercompany items and transactions have been eliminated in consolidation. The accompanying unaudited consolidated financial statements of the Company have been prepared in accordance with U.S. generally accepted accounting principles ("GAAP") for interim financial information and with the instructions to Form 10-Q and Regulation S-X. Accordingly, they do not include all of the information and notes to the financial statements required by U.S. GAAP for complete financial statements. In the opinion of management, all normal, recurring adjustments considered necessary for a fair presentation have been included. The consolidated financial statements should be read in conjunction with the audited consolidated financial statements and accompanying notes for the year ended December 31, 2018
New Accounting Pronouncements, Policy [Policy Text Block]	In August 2018, the SEC adopted the final rule under SEC Release No. 33-10532, "Disclosure Update and Simplification", streamlining certain disclosure requirements to reduce redundant, duplicative, or outdated disclosures. In addition, the amendments expand disclosures related to interim-period changes in stockholders’ equity and noncontrolling interests. Management has adopted and presented the expanded disclosures related to interim-period changes in stockholders' equity beginning with the first quarter ended March 31, 2019 and interim periods from that point, along with the respective comparable periods. In January 2017, the Financial Accounting Standards Board ("FASB") issued ASU 2017-04, “Simplifying the Test for Goodwill Impairment,” which continues to require an entity to review goodwill for potential impairment, but eliminates or replaces additional tests and assessments within the prior guidance. The provisions of this update are effective for fiscal years beginning after December 15, 2019, with early adoption permitted for impairment measurement tests occurring after January 1, 2017. We have adopted the provisions of the standard as part of our 2019 annual impairment test completed in September 2019 and have determined that this change did not materially impact our 2019 assessment. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments". This update requires measurement and recognition of expected versus incurred credit losses for financial assets held. ASU 2016-13 is effective for annual periods beginning after December 15, 2019, and interim periods therein. Based on our initial assessment, we believe the impact of adoption of the standard will not have a material impact on our financial statements when adopted in 2020. In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)". This update seeks to increase the transparency and comparability among entities by requiring public entities to recognize lease assets and lease liabilities on the balance sheet and disclose key information about leasing arrangements. To satisfy the standard’s objective, a lessee will recognize a right-of-use asset representing its right to use the underlying asset for the lease term and a lease liability for the obligation to make lease payments. Both the right-of-use asset and lease liability will initially be measured at the present value of the lease payments, with subsequent measurement dependent on the classification of the lease as either a finance or an operating lease. For leases with a term of twelve months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. If a lessee makes this election, it should recognize lease expense for such leases generally on a straight-line basis over the lease term. In July 2018, the FASB issued ASU 2018-10, "Leases (Topic 842) - Codification Improvements" which contains several FASB Codification improvements for ASC Topic 842, including several implementation issues and ASU 2018-11, "Leases (Topic 842) - Targeted Improvements" which provides entities with an additional transition method for implementing ASC Topic 842. Entities have the option to apply the new standard at the adoption date, recognizing a cumulative-effect adjustment to the opening balance of retained earnings along with the modified retrospective approach previously identified, both of which include a number of practical expedients that companies may elect to apply. Under the cumulative-effect adjustment comparative periods would not be restated, and would instead be presented under the legacy ASC Topic 840 guidance. Under the modified retrospective approach leases are recognized and measured under the noted guidance at the beginning of the earliest period presented. The new standard is effective for public companies for annual periods beginning after December 15, 2018, and interim periods within those years, with early adoption permitted. We have adopted this guidance as of January 1, 2019 and the effect of the adoption was not material to our financial statements.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates
Segment Reporting, Policy [Policy Text Block]	Segment Information We provide truckload services across the United States (U.S.) and parts of Canada. These truckload services are primarily asset-based transportation services in the dry van truckload market. We also offer truckload temperature-controlled transportation services, although not significant to our operations. Millis Transfer is an asset based transportation company in the dry van truckload market. Our Chief Operating Decision Maker oversees and manages all of our transportation services, on a combined basis, including previously acquired entities. As a result of the foregoing, we have determined that we have one segment, consistent with the authoritative accounting guidance on disclosures about segments of an enterprise and related information.
Revenue [Policy Text Block]	The Company recognizes revenue over time as control of the promised services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those services. The delivery of the shipment and completion of the performance obligation allows for the collection of payment generally within 30 days after the delivery date of the shipment for the majority of our customers.
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and Cash Equivalents
Property, Plant and Equipment, Policy [Policy Text Block]	Prepaid Tires, Property, Equipment, and Depreciation Property and equipment are reported at cost, net of accumulated depreciation. Maintenance and repairs are charged to operations as incurred. New tires are capitalized separately from revenue equipment and are reported separately as “Prepaid tires” in the consolidated balance sheets and amortized over two years . Depreciation for financial statement purposes is computed by the straight-line method for all assets other than tractors. We recognize depreciation expense on new tractors using the 125% declining balance method. New tractors are depreciated to salvage values of $15,000 while new trailers are depreciated to salvage values of $4,000
Earnings Per Share, Policy [Policy Text Block]	Earnings per Share
Income Tax, Policy [Policy Text Block]	Income Taxes
Income Tax Uncertainties, Policy [Policy Text Block]	We recognize the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. We record interest and penalties related to unrecognized tax benefits in income tax expense.
Subsequent Events, Policy [Policy Text Block]	Subsequent Events Subsequent to September 30, 2019, we paid an additional $32.4 million to retire the revenue equipment debt acquired through the acquisition of Millis Transfer, resulting in $21.1 million acquired debt outstanding.

Millis Transfer Acquistion (Tab

Millis Transfer Acquistion (Tables)	Aug. 26, 2019
Business Combination, Separately Recognized Transactions [Line Items]
Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block]	TOTAL PURCHASE PRICE CONSIDERATION (in thousands) Cash paid pursuant to the Acquisition and Merger Agreement $ 62,127 Common stock issued pursuant to the Acquisition and Merger Agreement 750 Total cash paid and common stock issued $ 62,877
Business Combination, Segment Allocation [Table Text Block]	(in thousands) Trade and other accounts receivable $ 14,574 Other current assets 1,696 Property and equipment 121,151 Other non-current assets 802 Intangible assets 15,300 Goodwill 32,611 Total assets 186,134 Accounts payable, accrued expenses, and current portion of long-term debt (30,381 ) Insurance accruals (4,871 ) Long-term debt (70,191 ) Deferred taxes (17,814 ) Total cash paid and common stock issued $ 62,877

Other Intangible, Net and Goo_2

Other Intangible, Net and Goodwill (Tables)	9 Months Ended
	Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets [Table Text Block]	Amortization period (years) Gross Amount Accumulated Amortization Net intangible assets (in thousands) Customer relationships 15-20 $ 23,000 $ 2,894 $ 20,106 Tradename 0.5-10 12,900 7,986 4,914 Covenants not to compete 1-10 5,300 2,434 2,866 $ 41,200 $ 13,314 $ 27,886
Goodwill [Line Items]
Schedule of Goodwill [Table Text Block]	(in thousands) Balance at December 31, 2018 $ 132,410 Acquisition 32,611 Balance at September 30, 2019 $ 165,021

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three months ended September 30, 2019 Net Income (numerator) Shares (denominator) Per Share Amount Basic EPS $ 20,501 81,992 $ 0.25 Effect of restricted stock — 48 Diluted EPS $ 20,501 82,040 $ 0.25 Three months ended September 30, 2018 Net Income (numerator) Shares (denominator) Per Share Amount Basic EPS $ 19,056 81,965 $ 0.23 Effect of restricted stock — 27 Diluted EPS $ 19,056 81,992 $ 0.23 Nine months ended September 30, 2019 Net Income (numerator) Shares (denominator) Per Share Amount Basic EPS $ 60,180 81,965 $ 0.73 Effect of restricted stock — 43 Diluted EPS $ 60,180 82,008 $ 0.73 Nine months ended September 30, 2018 Net Income (numerator) Shares (denominator) Per Share Amount Basic EPS $ 50,237 82,530 $ 0.61 Effect of restricted stock — 34 Diluted EPS $ 50,237 82,564 $ 0.61

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2019
Stock-Based Compensation [Abstract]
Disclosure of restricted stock award activity	The following tables summarize our restricted stock award activity for the three and nine months ended September 30, 2019 and 2018 . Three Months Ended September 30, 2019 Number of Shares of Restricted Stock Awards (in thousands) Weighted Average Grant Date Fair Value Unvested at beginning of period 58.5 $ 19.83 Granted 5.0 20.38 Vested (15.2 ) 18.60 Forfeited — — Outstanding (unvested) at end of period 48.3 $ 20.28 Three Months Ended September 30, 2018 Number of Shares of Restricted Stock Awards (in thousands) Weighted Average Grant Date Fair Value Unvested at beginning of period 35.0 $ 20.29 Granted — — Vested (8.5 ) 17.11 Forfeited — — Outstanding (unvested) at end of period 26.5 $ 21.31 Nine Months Ended September 30, 2019 Number of Shares of Restricted Stock Awards (in thousands) Weighted Average Grant Date Fair Value Unvested at beginning of period 26.5 $ 21.31 Granted 92.5 19.47 Vested (70.2 ) 19.63 Forfeited (0.5 ) 17.11 Outstanding (unvested) at end of period 48.3 $ 20.28 Nine Months Ended September 30, 2018 Number of Shares of Restricted Stock Awards (in thousands) Weighted Average Grant Date Fair Value Unvested at beginning of period 53.7 $ 21.82 Granted 5.0 19.03 Vested (30.7 ) 22.03 Forfeited (1.5 ) 17.11 Outstanding (unvested) at end of period 26.5 $ 21.31

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Reconciliation of Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: 2019 (in thousands) Balance at January 1, 2019 $ 4,585 Additions based on tax positions related to current year 1,212 Additions for tax positions of prior years 124 Reductions for tax positions of prior years (140 ) Reductions due to lapse of applicable statute of limitations (867 ) Settlements (76 ) Balance at September 30, 2019 $ 4,838

Related Party (Tables)

Related Party (Tables)	9 Months Ended
	Sep. 30, 2019
Related Party [Abstract]
Schedule of Related Party Transactions [Table Text Block]	The payments with related parties for the three and nine months ended September 30, 2019 and 2018 (in thousands) were as follows: Three months ended September 30, 2019 2018 Payments for parts and services $ 30 $ 65 Terminal lease payments — 251 $ 30 $ 316 Nine months ended September 30, 2019 2018 Payments for parts and services $ 255 $ 346 Terminal lease payments — 712 $ 255 $ 1,058

Segment Information (Details)

Segment Information (Details)	9 Months Ended
	Sep. 30, 2019segments
Segment Reporting Information [Line Items]
Number of Segments	1

Revenue Recognition (Details)

Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Contract with Customer, Asset, after Allowance for Credit Loss	$ 1,200		$ 1,200		$ 1,100
Operating Revenue	147,908	$ 151,279	429,589	$ 463,800
Revenue from Contract with Customer, Including Assessed Tax	4,000	3,200	9,600	11,100
fuel surcharge [Member]
Disaggregation of Revenue [Line Items]
Fuel surcharge revenue	$ 18,400	$ 21,400	$ 53,500	$ 65,300

Cash and Cash Equivalents (Deta

Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Property, Plant and Equipment [Line Items]
Restricted Cash and Cash Equivalents	$ 18,800	$ 21,500
Restricted Cash included in other current assets	2,040	3,100	$ 3,298
Restricted Cash included in other assets	$ 16,784	$ 18,400	$ 19,177

Millis Transfer Acquistion (Det

Millis Transfer Acquistion (Details) - USD ($)	Aug. 26, 2019	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Business Combinations [Abstract]
Payments to Acquire Businesses, Net of Cash Acquired			$ 62,127,000	$ 0
Business Combination, Total Consideration	$ 156,200,000
Business Combination, Cash and Equity Transferred	62,877,000
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	750,000
Accounts and Other Receivables, Net, Current	14,574,000
Other Assets, Current	1,696,000
Property, Plant and Equipment, Net	121,151,000
Other Assets, Noncurrent	802,000
Intangible Assets, Current	15,300,000
Goodwill, Acquired During Period	32,611,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	186,134,000
Accounts Payable and Accrued Liabilities	(30,381,000)
Self Insurance Reserve	(4,871,000)
Long-term Debt	(70,191,000)
Deferred Taxes	(17,814,000)
Noncash or Part Noncash Acquisition, Debt Assumed	$ 93,300,000
Debt, Long-term and Short-term, Combined Amount		$ 53,500,000	$ 53,500,000		$ 0
Aquired Business Percent of Assets		19.60%	19.60%
Acquired Business Percent of Revenue		10.60%	3.60%
Business Combination, Acquisition Related Costs		$ 400,000	$ 500,000

Prepaid Tires, Property, Equi_2

Prepaid Tires, Property, Equipment and Depreciation (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Amortization Period of Tires	2 years
Sold revenue equipment in other current assets	$ 6,800	$ 3,800
Tractors [Member]
Property, Plant and Equipment [Line Items]
Property, Plant, and Equipment, Salvage Value	15
Trailers [Member]
Property, Plant and Equipment [Line Items]
Property, Plant, and Equipment, Salvage Value	$ 4

Other Intangible, Net and Goo_3

Other Intangible, Net and Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-Lived Intangible Assets, Amortization Expense	$ 700	$ 600	$ 1,900	$ 1,900
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	15,300
Carrying amount of goodwill	165,021		165,021		$ 132,410
GoodwillAcquiredDuringPeriod	32,611
Gross Amount	41,200		41,200
Accumulated Amortization	13,314		13,314
Net Intangible Assets	27,886		27,886
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	23,000		23,000
Accumulated Amortization	2,894		2,894
Net Intangible Assets	20,106		20,106
Tradename
Finite-Lived Intangible Assets [Line Items]
Gross Amount	12,900		12,900
Accumulated Amortization	7,986		7,986
Net Intangible Assets	4,914		4,914
Covenants Not to Compete
Finite-Lived Intangible Assets [Line Items]
Gross Amount	5,300		5,300
Accumulated Amortization	2,434		2,434
Net Intangible Assets	$ 2,866		$ 2,866
Maximum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization period (years)			20 years
Maximum [Member] | Tradename
Finite-Lived Intangible Assets [Line Items]
Amortization period (years)			10 years
Maximum [Member] | Covenants Not to Compete
Finite-Lived Intangible Assets [Line Items]
Amortization period (years)			10 years
Minimum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization period (years)			15 years
Minimum [Member] | Tradename
Finite-Lived Intangible Assets [Line Items]
Amortization period (years)			6 months
Minimum [Member] | Covenants Not to Compete
Finite-Lived Intangible Assets [Line Items]
Amortization period (years)			1 year

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 20,501	$ 22,361	$ 17,318	$ 19,056	$ 17,803	$ 13,378	$ 60,180	$ 50,237
Basic EPS, Shares	81,992			81,965			81,965	82,530
Basic EPS, Per Share Amount	$ 0.25			$ 0.23			$ 0.73	$ 0.61
Effect of restricted stock	$ 0			$ 0			$ 0	$ 0
Effect of restricted stock, Shares	48			27			43	34
Diluted EPS, Net Income	$ 20,501			$ 19,056			$ 60,180	$ 50,237
Diluted EPS, Shares	82,040			81,992			82,008	82,564
Diluted EPS, Per Share Amount	$ 0.25			$ 0.23			$ 0.73	$ 0.61
Retained Earnings [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 20,501	$ 22,361	$ 17,318	$ 19,056	$ 17,803	$ 13,378	$ 60,180

Equity (Details)

Equity (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share Repurchases [Abstract]
Number of Shares Authorized to be Repurchased	6,900		6,900
Treasury Stock, Shares, Acquired	0	200	0	1,400
Dividends, Common Stock, Cash	$ 1.6	$ 1.6	$ 4.9	$ 5

Stock-Based Compensation (Detai

Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jul. 11, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition			8 months 12 days
Restricted Stock Shares Authorized					900,000
Stock-based Compensation	$ 300	$ 100	$ 1,600	$ 400
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 400		$ 400
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested at beginning of year, Number of Restricted Stock Awards (in shares)	58,500	35,000	26,500	53,700
Unvested at beginning of year, Weighted Average Grant Date Fair Value (in dollars)	$ 19.83	$ 20.29	$ 21.31	$ 21.82
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	5,000	0	92,500	5,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 20.38	$ 0	$ 19.47	$ 19.03
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(15,200)	(8,500)	(70,200)	(30,700)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 0	$ 0	$ 17.11	$ 17.11
Outstanding (unvested) at end of year, Number of Restricted Stock Awards (in shares)	48,300	26,500	48,300	26,500
Outstanding (unvested) at end of year, Weighted Average Grant Date Fair Value (in dollars)	$ 20.28	$ 21.31	$ 20.28	$ 21.31
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	0	0	(500)	(1,500)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 18.60	$ 17.11	$ 19.63	$ 22.03

Long-Term Debt (Details)

Long-Term Debt (Details) - USD ($)	Aug. 26, 2019	Sep. 30, 2019	Dec. 31, 2018	Nov. 01, 2016	Nov. 11, 2013
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity, Current		$ 100,000,000		$ 175,000,000	$ 250,000,000
Allowable Amount For Issuance of Letters of Credit		$ 30,000,000			$ 20,000,000
Debt Instrument, Covenant, Leverage Ratio		2
Debt Covenant, Minimum Net Income Requirement		$ 1
Debt Covenant, Minimum Tangible Net Worth		250,000,000
Noncash or Part Noncash Acquisition, Debt Assumed	$ 93,300,000
Debt, Long-term and Short-term, Combined Amount		53,500,000	$ 0
Letters of Credit Outstanding, Amount		11,300,000
Line of Credit Facility, Current Borrowing Capacity		$ 88,700,000
Prime Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.00%
Minimum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.0725%
Long Term Debt, Interest Rate at Period End		3.13%
Long-term Debt, Term		36 months
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.70%
Maximum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.175%
Long Term Debt, Interest Rate at Period End		5.17%
Long-term Debt, Term		84 months
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.90%
Accordion Feature [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity, Current		$ 100,000,000

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Effective Income Tax Rate, Percent	25.20%	25.90%	24.50%	18.40%
Valuation Allowance [Abstract]
Valuation Allowance, Amount	$ 0		$ 0		$ 0
Income Tax Uncertainties [Abstract]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	3,800		3,800		3,600
Unrecognized Tax Benefits, Period Increase (Decrease)	(100)	$ 300	300	$ (1,600)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	900		900		$ 1,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	100	$ 100	(100)	$ (1,400)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance beginning of period			4,585
Additions based on tax positions related to current year			1,212
Additions for tax positions of prior years			124
Reductions for tax positions of prior years			(140)
Reductions due to lapse of applicable statute of limitations			(867)
Settlements			(76)
Balance end of period	4,838		4,838
Maximum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound	1,200		1,200
Minimum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound	$ 200		$ 200

Operating Leases (Details)

Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	$ 0	$ 900	$ 300	$ 4,500
Terminal Facilities
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	600	1,200	2,000	3,800
Terminal Facilities | Related Party [Member]
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	0	251	0	712
Related Party Transaction, Expenses from Transactions with Related Party	$ 0	$ 300	$ 0	$ 700

Related Party (Details)

Related Party (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Due to Related Parties, Current	$ 0		$ 0		$ 100
Operating Leases, Rent Expense	0	$ 900	300	$ 4,500
Costs and Expenses, Related Party	30	316	255	1,058
Related Party [Member]
Related Party Transaction [Line Items]
Payments for parts and services	30	65	255	346
Terminal Facilities
Related Party Transaction [Line Items]
Operating Leases, Rent Expense	600	1,200	2,000	3,800
Terminal Facilities | Related Party [Member]
Related Party Transaction [Line Items]
Operating Leases, Rent Expense	$ 0	$ 251	$ 0	$ 712

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Millions	Sep. 30, 2019USD ($)
Commitments and Contingencies Disclosure [Abstract]
Unrecorded Unconditional Purchase Obligation	$ 82.2

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Nov. 12, 2019
Subsequent Events [Abstract]
Repayments of Debt	$ 32,400
Acquired Debt Outstanding		$ 21,100