Wabash National (WNC) 10-K 25 Feb 21 2020 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 12, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Document Transition Report	false
Entity File Number	001-10883
Entity Registrant Name	WABASH NATIONAL CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	52-1375208
Entity Address, Address Line One	1000 Sagamore Parkway South
Entity Address, City or Town	Lafayette
Entity Address, State or Province	IN
Entity Address, Postal Zip Code	47905
City Area Code	765
Local Phone Number	771-5300
Title of 12(b) Security	Common Stock, $.01 Par Value
Trading Symbol	WNC
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 556,508,720
Entity Common Stock, Shares Outstanding (in shares)		52,056,803
Documents Incorporated by Reference	Part III of this Form 10-K incorporates by reference certain portions of the registrant’s Proxy Statement for its Annual Meeting of Stockholders to be filed within 120 days after December 31, 2020.
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Central Index Key	0000879526
Current Fiscal Year End Date	--12-31

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 217,677	$ 140,516
Accounts receivable, net	101,301	172,737
Inventories	163,750	186,914
Prepaid expenses and other	63,036	41,222
Total current assets	545,764	541,389
Property, plant, and equipment, net	209,676	221,346
Goodwill	199,560	311,026
Intangible assets	166,887	189,898
Other assets	39,583	40,932
Total assets	1,161,470	1,304,591
Current liabilities:
Current portion of long-term debt	0	0
Current portion of finance lease obligations	348	327
Accounts payable	104,425	134,821
Other accrued liabilities	130,980	124,230
Total current liabilities	235,753	259,378
Long-term debt	447,979	455,386
Finance lease obligations	30	378
Deferred income taxes	46,777	37,576
Other non-current liabilities	26,052	30,885
Total liabilities	756,591	783,603
Commitments and contingencies
Stockholders' equity:
Common stock, $0.01 par value: 200,000,000 shares authorized; 52,536,482 and 53,473,620 shares outstanding, respectively	755	750
Additional paid-in capital	644,695	638,917
Retained earnings	107,233	221,841
Accumulated other comprehensive income (loss)	7,633	(3,978)
Treasury stock, at cost: 23,004,607 and 21,640,109 common shares, respectively	(355,437)	(336,542)
Total stockholders' equity	404,879	520,988
Total liabilities and stockholders' equity	$ 1,161,470	$ 1,304,591

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares outstanding (in shares)	52,536,482	53,473,620
Treasury stock, shares (in shares)	23,004,607	21,640,109

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Net sales	$ 1,481,889	$ 2,319,136	$ 2,267,278
Cost of sales	1,322,135	2,012,754	1,983,627
Gross profit	159,754	306,382	283,651
General and administrative expenses	92,740	108,274	95,114
Selling expenses	25,080	34,851	33,046
Amortization of intangible assets	21,981	20,471	19,468
Acquisition expenses	0	0	68
Impairment and other, net	105,561	0	24,968
(Loss) income from operations	(85,608)	142,786	110,987
Other income (expense):
Interest expense	(24,194)	(27,340)	(28,759)
Other, net	588	2,285	13,776
Other expense, net	(23,606)	(25,055)	(14,983)
(Loss) income before income tax	(109,214)	117,731	96,004
Income tax (benefit) expense	(11,802)	28,156	26,583
Net (loss) income	$ (97,412)	$ 89,575	$ 69,421
Net (loss) income per share:
Basic (in usd per share)	$ (1.84)	$ 1.64	$ 1.22
Diluted (in usd per share)	$ (1.84)	$ 1.62	$ 1.19
Weighted average common shares outstanding (in thousands):
Basic (in shares)	52,945	54,695	56,996
Diluted (in shares)	52,945	55,290	58,430
Dividends declared per share (in usd per share)	$ 0.320	$ 0.320	$ 0.305

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (97,412)	$ 89,575	$ 69,421
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustment and other	(316)	712	(193)
Unrealized gain (loss) on derivative instruments	11,927	(1,347)	(765)
Total other comprehensive income (loss)	11,611	(635)	(958)
Comprehensive (loss) income	$ (85,801)	$ 88,940	$ 68,463

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings (Deficit)	Accumulated Other Comprehensive Losses	Treasury Stock
Balance beginning of period (in shares) at Dec. 31, 2017		57,564,493
Balance at beginning of period at Dec. 31, 2017	$ 506,063	$ 737	$ 653,435	$ 98,728	$ (2,385)	$ (244,452)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	69,421			69,421
Foreign currency translation and other	(193)				(193)
Stock-based compensation (in shares)		404,628
Stock-based compensation	10,169	$ 6	10,163
Stock repurchase (in shares)		(2,935,978)
Stock repurchase	(58,383)					(58,383)
Equity component of convertible senior notes repurchase	(35,519)		(35,519)
Common stock dividends	(17,905)			(17,905)
Unrealized gain on derivative instruments, net of tax	(765)				(765)
Stock option exercises (in shares)		102,645
Stock option exercises	961	$ 1	960
Balance end of period (in shares) at Dec. 31, 2018		55,135,788
Balance at end of period at Dec. 31, 2018	473,849	$ 744	629,039	150,244	(3,343)	(302,835)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	89,575			89,575
Foreign currency translation and other	712				712
Stock-based compensation (in shares)		319,430
Stock-based compensation	9,036	$ 5	9,031
Stock repurchase (in shares)		(2,072,798)
Stock repurchase	(33,707)					(33,707)
Common stock dividends	(17,978)			(17,978)
Unrealized gain on derivative instruments, net of tax	(1,347)				(1,347)
Stock option exercises (in shares)		91,200
Stock option exercises	848	$ 1	847
Balance end of period (in shares) at Dec. 31, 2019		53,473,620
Balance at end of period at Dec. 31, 2019	520,988	$ 750	638,917	221,841	(3,978)	(336,542)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(97,412)			(97,412)
Foreign currency translation and other	(316)				(316)
Stock-based compensation (in shares)		212,009
Stock-based compensation	4,510	$ 4	4,506
Stock repurchase (in shares)		(1,262,459)
Stock repurchase	(18,895)					(18,895)
Common stock dividends	(17,196)			(17,196)
Unrealized gain on derivative instruments, net of tax	$ 11,927				11,927
Stock option exercises (in shares)	113,312	113,312
Stock option exercises	$ 1,273	$ 1	1,272
Balance end of period (in shares) at Dec. 31, 2020		52,536,482
Balance at end of period at Dec. 31, 2020	$ 404,879	$ 755	$ 644,695	$ 107,233	$ 7,633	$ (355,437)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net (loss) income	$ (97,412)	$ 89,575	$ 69,421
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation	25,989	21,886	21,215
Amortization of intangibles	21,981	20,471	19,468
Net (gain) loss on sale of assets and business divestiture	(1,567)	(109)	(10,148)
Loss on debt extinguishment	396	165	280
Deferred income taxes	5,016	3,420	(2,976)
Stock-based compensation	4,509	9,036	10,169
Non-cash interest expense	1,112	1,045	1,745
Impairment and other, net	107,114	0	24,968
Accounts receivable	71,436	8,327	(39,539)
Inventories	21,099	(2,510)	(18,713)
Prepaid expenses and other	(2,875)	(3,809)	4,548
Accounts payable and accrued liabilities	(28,266)	(817)	32,653
Other, net	(4,398)	(396)	(620)
Net cash provided by operating activities	124,134	146,284	112,471
Cash flows from investing activities:
Capital expenditures	(20,131)	(37,645)	(34,009)
Proceeds from sale of assets and business divestiture	17,115	785	17,776
Other, net	0	0	3,060
Net cash used in investing activities	(3,016)	(36,860)	(13,173)
Cash flows from financing activities:
Proceeds from exercise of stock options	1,273	848	961
Dividends paid	(17,324)	(17,797)	(17,768)
Borrowings under revolving credit facilities	45,794	619	937
Payments under revolving credit facilities	(45,794)	(619)	(937)
Principal payments under finance lease obligations	(327)	(308)	(290)
Principal payments against senior notes	(10,000)	0	0
Borrowings under term loan credit facility, net of original issuance discount	148,500	0	0
Principal payments under term loan credit facility	(146,393)	(50,470)	(1,880)
Principal payments under industrial revenue bond	0	0	(93)
Debt issuance costs paid	(791)	(164)	(476)
Convertible senior notes repurchase	0	0	(80,200)
Stock repurchases	(18,895)	(33,707)	(58,383)
Net cash used in financing activities	(43,957)	(101,598)	(158,129)
Cash, cash equivalents, and restricted cash:
Net increase (decrease) in cash, cash equivalents, and restricted cash	77,161	7,826	(58,831)
Cash, cash equivalents, and restricted cash at beginning of period	140,516	132,690	191,521
Cash, cash equivalents, and restricted cash at end of period	217,677	140,516	132,690
Supplemental disclosures of cash flow information:
Cash paid for interest	23,411	26,234	27,386
(Refunds received) cash paid for income taxes	$ (4,670)	$ 20,379	$ 24,243

DESCRIPTION OF THE BUSINESS

DESCRIPTION OF THE BUSINESS	12 Months Ended
	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
DESCRIPTION OF THE BUSINESS	DESCRIPTION OF THE BUSINESS

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Oct. 01, 2020
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Consolidation. The consolidated financial statements reflect the accounts of the Company and its wholly-owned and majority-owned subsidiaries. All significant intercompany profits, transactions, and balances have been eliminated in consolidation. Reclassifications. Certain prior period amounts have been reclassified to conform to the current year presentation. Use of Estimates. The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that directly affect the amounts reported in its consolidated financial statements and accompanying notes. Actual results could differ from these estimates. Cash and Cash Equivalents. Cash and cash equivalents include all highly liquid investments with a maturity of three months or less at the time of purchase. Accounts Receivable. Accounts receivable are shown net of expected losses and primarily include trade receivables. The Company records expected losses for customers based upon a variety of factors including the Company’s historical collection experience, the length of time the account has been outstanding and the financial condition of the customer. If the circumstances related to specific customers were to change, the Company’s estimates of expected losses with respect to the collectability of the related accounts could be further adjusted. The Company’s policy is to write-off receivables when they are determined to be uncollectible. Expected losses are charged to Selling and General and administrative expenses in the Consolidated Statements of Operations. The following table presents the changes in expected losses (in thousands): Years ended December 31, 2020 2019 2018 Balance at beginning of year $ 670 $ 665 $ 869 Expected losses 362 282 63 Write-offs, net of recoveries (496) (277) (267) Balance at end of year $ 536 $ 670 $ 665 Inventories. Inventories are stated at the lower of cost, determined on either the first-in, first-out or average cost method, or net realizable value. The cost of manufactured inventory includes raw material, labor and overhead. Prepaid Expenses and Other. Prepaid expenses and other as of December 31, 2020 and 2019 consists of the following (in thousands): December 31, 2020 2019 Chassis converter pool agreements $ 17,767 $ 10,164 Income tax receivables 18,073 8,701 Insurance premiums & maintenance agreements 4,384 3,217 Assets held for sale 1,897 3,020 All other 20,915 16,120 $ 63,036 $ 41,222 Chassis converter pool agreements represent chassis transferred to the Company on a restricted basis by the manufacturer, who retains the sole authority to authorize commencement of work on the chassis and to make certain other decisions with respect to the chassis including the terms and pricing of sales to the manufacturer’s dealers. Assets held for sale are related to unused land parcels. Insurance premiums and maintenance agreements are charged to expense over the contractual life, which is generally one year or less. Other items primarily consist of the Company’s commodity swap contracts that are in an asset position, contract assets related to contracts for which the Company recognizes revenue on an over time basis, and investments held by the Company’s captive insurance subsidiary. As of December 31, 2020 and 2019, there was no restricted cash included in prepaid expenses and other current assets. Property, Plant and Equipment. Property, plant and equipment are recorded at cost, net of accumulated depreciation. Maintenance and repairs are charged to expense as incurred, while expenditures that extend the useful life of an asset are capitalized. Depreciation is recorded using the straight-line method over the estimated useful lives of the depreciable assets. The estimated useful lives are up to 33 years for buildings and building improvements and range from three to ten years for machinery and equipment. Goodwill. Goodwill represents the excess purchase price over fair value of the net assets acquired. The Company determines its reporting units at the individual operating segment level, or one level below, when there is discrete financial information available that is regularly reviewed by segment management for evaluating operating results. The Company reviews goodwill for impairment, at the reporting unit level, annually on October 1 and whenever events or changes in circumstances indicate its carrying value may not be recoverable. In accordance with ASC 350, Intangibles - Goodwill and Other , goodwill is reviewed for impairment utilizing either a qualitative assessment or a quantitative process. The Company has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. An entity has an unconditional option to bypass the qualitative assessment in any period and proceed directly to performing the quantitative impairment test, which is the option the Company has historically chosen. For reporting units in which the Company performs the quantitative analysis, the Company compares the carrying value, including goodwill, of each reporting unit with its estimated fair value. If the fair value of the reporting unit exceeds its carrying value, the goodwill is not considered impaired. If the carrying value is greater than the fair value, the difference is recognized as an impairment loss charged to the reporting unit. After an impairment loss is recognized, the adjusted carrying amount of goodwill shall be its new accounting basis. The Company exercised its unconditional option to bypass the qualitative assessment of goodwill for all of its reporting units and instead prepared a quantitative assessment to estimate the fair value of each reporting unit at the annual testing date of October 1, 2020 utilizing a combination of the income approach and the market approach, weighted equally. Based on the quantitative assessment performed, all of the Company’s reporting units exceeded their carrying values; as such, there was no goodwill impairment as a result of the 2020 annual goodwill impairment test. As of December 31, 2019, goodwill allocated to the Company’s CTP, DPG, and FMP segments was approximately $2.6 million, $140.7 million, and $167.7 million, respectively. Within the DPG segment, goodwill was allocated between the Tank Trailers and Process Systems reporting units in the amount of $98.4 million and $42.3 million, respectively. The Company did not perform in-line with expectations during the first quarter of 2020, partially as a result of impacts to our business and operations due to the COVID-19 pandemic. In addition, subsequent to December 31, 2019, the Company’s share price and market capitalization declined. As a result, indicators of impairment were identified and the Company performed an interim quantitative assessment as of March 31, 2020, utilizing a combination of the income and market approaches, which were weighted evenly. The results of the quantitative analysis indicated the carrying value of the FMP and Tank Trailers reporting units exceeded their respective fair values and, accordingly, goodwill impairment charges of $95.8 million and $11.0 million, respectively, were recorded during the first quarter of 2020. The goodwill impairment charges, which are based on Level 3 fair value measurements, are included in Impairment and other, net in the Consolidated Statements of Operations. In the third quarter of 2018, the Aviation and Truck Equipment (“AVTE”) reporting unit within the Diversified Products reportable segment did not perform in-line with forecasted results driven by unfavorable market conditions that the Company believed would continue to impact the reporting unit for the foreseeable future. As a result, an indicator of impairment was identified, and the Company performed an interim quantitative assessment as of September 30, 2018, utilizing a combination of the income and market approaches. The results of the quantitative analysis indicated the carrying value of the reporting unit exceeded the fair value of the reporting unit and, accordingly, a goodwill impairment of $4.9 million was recorded. As further described in Note 20, during the fourth quarter of 2020 the Company sold its Beall® brand of tank trailers and associated assets. Prior to the divestiture Beall ® was an operating unit within the Tank Trailers reporting unit. In accordance with the relevant accounting guidance, as part of the sale the Company allocated $4.7 million of goodwill based upon the relative fair value of the Beall® operating unit compared to the Tank Trailers reporting unit as a whole. This goodwill was included in the carrying value of the disposed assets and the resulting loss recognized in connection with the sale. Subsequent to the divestiture, the Company performed an impairment assessment for the Tank Trailers reporting unit and concluded the fair value of the reporting unit continued to exceed the carrying value. Long-Lived Assets. Long-lived assets, consisting primarily of intangible assets and property, plant and equipment, are reviewed for impairment whenever facts and circumstances indicate that the carrying amount may not be recoverable. Specifically, this process involves comparing an asset’s carrying value to the estimated undiscounted future cash flows the asset is expected to generate over its remaining life. If this process were to result in the conclusion that the carrying value of a long-lived asset would not be recoverable, a write-down of the asset to fair value would be recorded through a charge to operations. Fair value is determined based upon discounted cash flows or appraisals as appropriate. Net intangible assets of approximately $1.1 million were written-off during the fourth quarter of 2020 in connection with the Beall ® divestiture. In the third quarter of 2018, due to the impairment indicators noted above related to the AVTE reporting unit with the Diversified Products reportable segment, the Company performed an interim impairment assessment of the long-lived assets of the AVTE reporting unit, including intangible assets and property, plant and equipment. Based on the results of our analysis it was determined that the carrying values of the trade names and property, plant and equipment of the AVTE reporting unit exceeded their fair values and, accordingly, an asset impairment charge totaling $7.1 million was recorded. AVTE Impairment. On January 22, 2019 the Company announced the divestiture of the AVTE business. In the fourth quarter of 2018, with the financial framework of the agreement to sell the AVTE business largely agreed to with the buyers, the Company evaluated the remaining assets of AVTE for impairment based on the economics of the, then proposed, transaction. As a result of the Company’s impairment analysis, an impairment of $13.0 million was recorded to fully impair all current assets of the AVTE business. Other Assets. The Company capitalizes the cost of computer software developed or obtained for internal use. Capitalized software is amortized using the straight-line method over three Warranties. The Company offers a limited warranty for its products with a coverage period that ranges between one ® trailer panels is ten years. The Company passes through component manufacturers’ warranties to our customers. The Company’s policy is to accrue the estimated cost of warranty coverage at the time of the sale. The following table presents the changes in the product warranty accrual included in Other accrued liabilities (in thousands): 2020 2019 Balance as of January 1 $ 22,575 $ 22,247 Provision for warranties issued in current year 4,334 8,027 Net adjustment to warranty accrual (228) (2,320) Payments (6,111) (5,379) Balance as of December 31 $ 20,570 $ 22,575 Self Insured Liabilities. The Company is self-insured up to specified limits for medical and workers’ compensation coverage. The self-insurance reserves have been recorded to reflect the undiscounted estimated liabilities, including claims incurred but not reported, as well as catastrophic claims as appropriate. The following table presents the changes in the self-insurance accrual included in Other accrued liabilities (in thousands): 2020 2019 Balance as of January 1 $ 12,934 $ 9,890 Expense 47,612 57,733 Payments (48,460) (54,689) Balance as of December 31 $ 12,086 $ 12,934 Income Taxes. The Company determines its provision or benefit for income taxes under the asset and liability method. The asset and liability method measures the expected tax impact at current enacted rates of future taxable income or deductions resulting from differences in the tax and financial reporting basis of assets and liabilities reflected in the Consolidated Balance Sheets. Future tax benefits of tax losses and credit carryforwards are recognized as deferred tax assets. Deferred tax assets are reduced by a valuation allowance to the extent management determines that it is more-likely-than-not the Company would not realize the value of these assets. The Company accounts for income tax contingencies by prescribing a “more-likely-than-not” recognition threshold that a tax position is required to meet before being recognized in the financial statements. Used Trailer Trade Commitments. The Company may accept trade-in of used trailers when a customer enters into a contract to purchase a new trailer. However, in the contracts for the sale of the new trailers, there is no commitment to repurchase that trailer or a similar trailer in the future. As of December 31, 2020, the Company had no outstanding trade commitments and $3.5 million outstanding trade commitments as of December 31, 2019. On occasion, the amount of the trade allowance provided for in the used trailer commitments, or cost, may exceed the net realizable value of the underlying used trailer. In these instances, the Company’s policy is to recognize the loss related to these commitments at the time the new trailer revenue is recognized. Net realizable value of used trailers is measured considering market sales data for comparable types of trailers. Concentration of Credit Risk. Financial instruments that potentially subject us to significant concentrations of credit risk consist principally of cash, cash equivalents, and customer receivables. We place our cash and cash equivalents with high quality financial institutions. Generally, we do not require collateral or other security to support customer receivables. Research and Development. Research and development expenses are charged to Cost of sales and General and administrative expenses in the Consolidated Statements of Operations as incurred and were $21.9 million, $19.5 million, and $8.8 million in 2020, 2019 and 2018, respectively.

NEW ACCOUNTING PRONOUNCEMENTS

NEW ACCOUNTING PRONOUNCEMENTS	12 Months Ended
	Dec. 31, 2020
Accounting Standards Update and Change in Accounting Principle [Abstract]
NEW ACCOUNTING PRONOUNCEMENTS	NEW ACCOUNTING PRONOUNCEMENTSIn June 2016, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standard Update (“ASU”) 2016-13, “Financial Instruments - Credit Losses,” which introduced new guidance for an approach based on expected losses to estimate credit losses on certain types of financial instruments. It also modifies the impairment model for available-for-sale debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. Instruments in scope include loans, held-to-maturity debt securities, and net investments in leases as well as reinsurance and trade receivables. In November 2018, the FASB issued ASU 2018-19, which clarifies that operating lease receivables are outside the scope of the new standard. The Company adopted the standard using the modified retrospective approach as required on January 1, 2020. The adoption of the new credit losses model did not have a material impact on the Company’s consolidated financial statements.

REVENUE RECOGNITION

REVENUE RECOGNITION	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
REVENUE RECOGNITION	REVENUE RECOGNITION The Company recognizes revenue from the sale of its products when obligations under the terms of a contract with our customers are satisfied; this occurs with the transfer of control of our products and replacement parts or throughout the completion of service work. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring promised goods or services to a customer and excludes all taxes collected from the customer. Shipping and handling fees are included in Net sales and the associated costs included in Cost of sales in the Consolidated Statements of Operations. For shipping and handling costs that take place after the transfer of control, the Company is applying the practical expedient and treating it as a fulfillment cost. Incidental items that are immaterial in the context of the contract are recognized as expense. For performance obligations satisfied over time, which include certain equipment-related sales within our Diversified Products reportable segment that have no alternative use and contain an enforceable right to payment, as well as service work whereby the customer simultaneously receives and consumes the benefits provided, the Company recognizes revenue on the basis of the Company’s efforts or inputs to the satisfaction of these performance obligations, measured by actual total cost incurred to the total estimated costs for each project. Total revenue recognized over time was not material to the consolidated financial statements for all periods presented. The Company has identified three separate and distinct performance obligations: (1) the sale of a trailer or equipment, (2) the sale of replacement parts, and (3) service work. For trailer, truck body, equipment, and replacement part sales, control is transferred and revenue is recognized from the sale upon shipment to or pick up by the customer in accordance with the contract terms. The Company does not have any material extended payment terms as payment is received shortly after the point of sale. Accounts receivable are recorded when the right to consideration becomes unconditional. The Company does have customers who pay for the product prior to the transfer of control which is recorded as customer deposits in Other accrued liabilities as shown in Note 8. Customer deposits are recognized as revenue when the Company performs its obligations under the contract and transfers control of the product.

GOODWILL AND OTHER INTANGIBLE A

GOODWILL AND OTHER INTANGIBLE ASSETS	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND OTHER INTANGIBLE ASSETS	GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill. During the fourth quarters of 2020, 2019, and 2018, the Company completed its goodwill impairment test using the quantitative assessment. Except for the impairment charges during the first quarter of 2020 and third quarter of 2018 discussed below, based on all assessments performed in each of the last three years the Company believed it was more likely than not that the fair value of its reporting units were greater than their carrying amount and no additional impairment of goodwill was recognized. As of December 31, 2019, goodwill allocated to the Company’s CTP, DPG, and FMP segments was approximately $2.6 million, $140.7 million, and $167.7 million, respectively. Within the DPG segment, goodwill was allocated between the Tank Trailers and Process Systems reporting units in the amount of $98.4 million and $42.3 million, respectively. The Company did not perform in-line with expectations during the first quarter of 2020, partially as a result of impacts to our business and operations due to the COVID-19 pandemic. In addition, subsequent to December 31, 2019, the Company’s share price and market capitalization declined. As a result, indicators of impairment were identified and the Company performed an interim quantitative assessment as of March 31, 2020, utilizing a combination of the income and market approaches, which were weighted evenly. The results of the quantitative analysis indicated the carrying value of the FMP and Tank Trailers reporting units exceeded their respective fair values and, accordingly, goodwill impairment charges of $95.8 million and $11.0 million, respectively, were recorded during the first quarter of 2020. The goodwill impairment charges, which are based on Level 3 fair value measurements, are included in Impairment and other, net in the Consolidated Statements of Operations. During the third quarter of 2018, the Company performed an interim impairment analysis after identifying indicators of impairment based on the results of the AVTE reporting unit. Based on this assessment, it was determined that all of the goodwill allocated to the AVTE reporting unit was impaired resulting in an impairment charge for the Diversified Products reporting segment of $4.9 million. As further described in Note 20, during the fourth quarter of 2020 the Company sold its Beall ® brand of tank trailers and associated assets. Prior to the divestiture Beall ® was an operating unit within the Tank Trailers reporting unit. In accordance with the relevant accounting guidance, as part of the sale the Company allocated $4.7 million of goodwill based upon the relative fair value of the Beall ® operating unit compared to the Tank Trailers reporting unit as a whole. This goodwill was included in the carrying value of the disposed assets and the resulting loss recognized in connection with the sale. Subsequent to the divestiture, the Company performed an impairment assessment for the Tank Trailers reporting unit and concluded the fair value of the reporting unit continued to exceed the carrying value. For the years ended December 31, 2020, 2019, and 2018, the changes in the carrying amounts of goodwill were as follows (in thousands): Commercial Trailer Products Diversified Products Final Mile Products Total Balance at December 31, 2018 Goodwill $ 4,288 $ 145,688 $ 167,715 $ 317,691 Accumulated impairment losses (1,663) (4,944) — (6,607) Net balance at December 31, 2018 2,625 140,744 167,715 311,084 Impact of divestiture on goodwill — (4,944) — (4,944) Impact of divestiture on accumulated impairment losses — 4,944 — 4,944 Effects of foreign currency — (58) — (58) Balance at December 31, 2019 Goodwill 4,288 140,686 167,715 312,689 Accumulated impairment losses (1,663) — — (1,663) Net balance as of December 31, 2019 2,625 140,686 167,715 311,026 Goodwill impairments — (10,971) (95,766) (106,737) Impact of divestiture on goodwill — (4,685) — (4,685) Effects of foreign currency — (44) — (44) Balance as of December 31, 2020 Goodwill 4,288 135,957 167,715 307,960 Accumulated impairment losses (1,663) (10,971) (95,766) (108,400) Net balance as of December 31, 2020 $ 2,625 $ 124,986 $ 71,949 $ 199,560 Intangible Assets. As of December 31, 2020, the balances of intangible assets, other than goodwill, were as follows (in thousands): Weighted Average Gross Intangible Accumulated Net Intangible Tradenames and trademarks 20 years $ 51,481 $ (19,975) $ 31,506 Customer relationships 13 years 276,973 (145,356) 131,617 Technology 12 years 12,828 (9,064) 3,764 Total $ 341,282 $ (174,395) $ 166,887 As of December 31, 2019, the balances of intangible assets, other than goodwill, were as follows (in thousands): Weighted Average Gross Intangible Accumulated Net Intangible Tradenames and trademarks 20 years $ 53,103 $ (17,962) $ 35,141 Customer relationships 13 years 282,863 (132,903) 149,960 Technology 12 years 14,045 (9,248) 4,797 Total $ 350,011 $ (160,113) $ 189,898 Intangible asset amortization expense was $22.0 million, $20.5 million, and $19.5 million for 2020, 2019, and 2018, respectively. Annual intangible asset amortization expense for the next 5 fiscal years is estimated to be $23.0 million in 2021; $17.9 million in 2022; $15.3 million in 2023; $15.1 million in 2024; and $14.0 million in 2025. Net intangible assets of approximately $1.1 million were written-off during the fourth quarter of 2020 in connection with the Beall ® divestiture.

INVENTORIES

INVENTORIES	12 Months Ended
	Dec. 31, 2020
Inventory Disclosure [Abstract]
INVENTORIES	INVENTORIES Inventories, net of reserves, consist of the following (in thousands): December 31, 2020 2019 Raw materials and components $ 99,418 $ 105,332 Finished goods 44,695 58,224 Work in progress 11,592 14,269 Used trailers 1,478 2,499 Aftermarket parts 6,567 6,590 $ 163,750 $ 186,914

PROPERTY, PLANT AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT AND EQUIPMENT	PROPERTY, PLANT, AND EQUIPMENT Depreciation expense, which is recorded in Cost of sales and General and administrative expenses in the Consolidated Statements of Operations, as appropriate, on property, plant and equipment was $24.0 million, $20.2 million, and $19.7 million in 2020, 2019, and 2018, respectively, and includes depreciation of assets recorded in connection with the Company’s finance lease agreements. As of December 31, 2020 and 2019, the assets related to the Company’s finance lease agreements are recorded within Property, plant and equipment, net in the Consolidated Balance Sheets in the amount of $2.8 million and $2.9 million, respectively, net of accumulated depreciation of $1.8 million and $1.7 million, respectively. See Note 20 for information related to property, plant, and equipment sales during 2020. Property, plant and equipment, net consist of the following (in thousands): December 31, 2020 2019 Land $ 38,886 $ 36,794 Buildings and building improvements 149,364 146,210 Machinery and equipment 309,063 287,332 Construction in progress 9,349 36,179 506,662 506,515 Less: accumulated depreciation (296,986) (285,169) $ 209,676 $ 221,346

OTHER ACCRUED LIABILITIES

OTHER ACCRUED LIABILITIES	12 Months Ended
	Dec. 31, 2020
Payables and Accruals [Abstract]
OTHER ACCRUED LIABILITIES	OTHER ACCRUED LIABILITIES The following table presents the major components of Other accrued liabilities (in thousands): December 31, 2020 2019 Customer deposits $ 37,792 $ 19,324 Chassis converter pool agreements 17,767 10,164 Warranty 20,570 22,575 Payroll and related taxes 16,163 25,263 Self-insurance 12,086 12,934 Accrued interest 4,368 4,696 Operating lease obligations 4,117 4,369 Accrued taxes 4,790 10,344 All other 13,327 14,561 $ 130,980 $ 124,230

LONG-TERM DEBT

LONG-TERM DEBT	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
LONG-TERM DEBT	LONG-TERM DEBT Long-term debt consists of the following (in thousands): December 31, 2020 December 31, 2019 Senior Notes due 2025 $ 315,000 $ 325,000 New Term Loan Credit Agreement 138,835 135,228 453,835 460,228 Less: unamortized discount and fees (5,856) (4,842) Less: current portion — — $ 447,979 $ 455,386 Senior Notes On September 26, 2017, the Company issued Senior Notes due 2025 (the “Senior Notes”) in an offering pursuant to Rule 144A or Regulation S under the Securities Act of 1933, as amended, with an aggregate principal amount of $325 million. The Senior Notes bear interest at the rate of 5.50% per annum from the date of issuance, and pay interest semi-annually in cash on April 1 and October 1 of each year. The Company used the net proceeds of $318.9 million from the sale of the Senior Notes to finance a portion of the acquisition of Supreme and to pay related fees and expenses. The Senior Notes will mature on October 1, 2025. At any time prior to October 1, 2020, the Company could have redeemed some or all of the Senior Notes for cash at a redemption price equal to 100% of the aggregate principal amount of the Senior Notes being redeemed plus an applicable make-whole premium set forth in the indenture for the Senior Notes and accrued and unpaid interest to, but not including, the redemption date. Prior to October 1, 2020, the Company could have redeemed up to 40% of the Senior Notes at a redemption price of 105.50% of the principal amount, plus accrued and unpaid interest to, but not including, the redemption date, with the proceeds of certain equity offerings so long as if, after any such redemption occurs, at least 60% of the aggregate principal amount of the Senior Notes remained outstanding. On and after October 1, 2020, the Company may redeem some or all of the Senior Notes at redemption prices (expressed as percentages of principal amount) equal to 102.750% for the twelve-month period beginning on October 1, 2020, 101.375% for the twelve-month period beginning October 1, 2021 and 100.000% beginning on October 1, 2022, plus accrued and unpaid interest to, but not including, the redemption date. Upon the occurrence of a Change of Control (as defined in the indenture for the Senior Notes), unless the Company has exercised its optional redemption right in respect of the Senior Notes, the holders of the Senior Notes have the right to require the Company to repurchase all or a portion of the Senior Notes at a price equal to 101% of the aggregate principal amount of the Senior Notes, plus any accrued and unpaid interest to, but not including, the date of repurchase. The Senior Notes are guaranteed on a senior unsecured basis by all direct and indirect existing and future domestic restricted subsidiaries, subject to certain restrictions. The Senior Notes and related guarantees are the Company and the guarantors’ general unsecured senior obligations and are subordinate to all of the Company and the guarantors’ existing and future secured debt to the extent of the assets securing that secured obligation. In addition, the Senior Notes are structurally subordinate to any existing and future debt of any of the Company’s subsidiaries that are not guarantors, to the extent of the assets of those subsidiaries. The indenture for the Senior Notes restricts the Company’s ability and the ability of certain of its subsidiaries to: (i) incur additional indebtedness; (ii) pay dividends or make other distributions in respect of, or repurchase or redeem, its capital stock or with respect to any other interest or participation in, or measured by, its profits; (iii) make loans and certain investments; (iv) sell assets; (v) create or incur liens; (vi) enter into transactions with affiliates; and (vii) consolidate, merge or sell all or substantially all of its assets. These covenants are subject to a number of important exceptions and qualifications. During any time when the Senior Notes are rated investment grade by Moody’s Investors Service, Inc. and Standard & Poor’s Ratings Services and no event of default has occurred or is continuing, many of such covenants will be suspended and the Company and its subsidiaries will not be subject to such covenants during such period. The indenture for the Senior Notes contains customary events of default, including payment defaults, breaches of covenants, failure to pay certain judgments and certain events of bankruptcy, insolvency and reorganization. If an event of default occurs and is continuing, the principal amount of the Senior Notes, plus accrued and unpaid interest, if any, may be declared immediately due and payable. These amounts automatically become due and payable if an event of default relating to certain events of bankruptcy, insolvency or reorganization occurs. As of December 31, 2020, the Company was in compliance with all covenants. Contractual coupon interest expense and accretion of discount and fees for the Senior Notes for the years ended December 31, 2020, 2019 and 2018, was $18.6 million, $18.5 million and $18.5 million, respectively and is included in Interest expense on the Company’s Consolidated Statements of Operations. During the third quarter of 2020, the Company repaid $10.0 million of the Senior Notes utilizing net proceeds from the closure of the new term loan credit agreement, which is described in more detail below. Revolving Credit Agreement On December 21, 2018, the Company entered into the Second Amended and Restated Credit Agreement (the “Revolving Credit Agreement”), among the Company, certain of its subsidiaries as borrowers (together with the Company, the “Borrowers”), the lenders from time to time party thereto, Wells Fargo Capital Finance, LLC, as the administrative agent, joint lead arranger and joint bookrunner (the “Revolver Agent”), and Citizens Business Capital, a division of Citizens Asset Finance, Inc., as syndication agent, joint lead arranger and joint bookrunner, which amended and restated the Company’s existing amended and restated revolving credit agreement, dated as of May 8, 2012. On September 28, 2020, the Company entered into the First Amendment to Second Amended and Restated Credit Agreement (together with the Second Amended and Restated Credit Agreement, the “Revolving Credit Agreement” or “Revolving Facility”) among the Company, certain of its subsidiaries party thereto, the lenders party thereto, and the Revolver Agent. The Amendment primarily made conforming changes to the provisions in the Revolving Credit Agreement to reflect modifications made under the new term loan credit agreement, which is described in more detail below. The Revolving Credit Agreement is guaranteed by certain subsidiaries of the Company (the “Revolver Guarantors”) and is secured by (i) first priority security interests (subject only to customary permitted liens and certain other permitted liens) in substantially all personal property of the Borrowers and the Revolver Guarantors, consisting of accounts receivable, inventory, cash, deposit and securities accounts and any cash or other assets in such accounts and, to the extent evidencing or otherwise related to such property, all general intangibles, licenses, intercompany debt, letter of credit rights, commercial tort claims, chattel paper, instruments, supporting obligations, documents and payment intangibles (collectively, the “Revolver Priority Collateral”), and (ii) second-priority liens on and security interests in (subject only to the liens securing the Term Loan Credit Agreement (as defined below), customary permitted liens and certain other permitted liens) (A) equity interests of each direct subsidiary held by the Borrowers and each Revolver Guarantor (subject to customary limitations in the case of the equity of foreign subsidiaries), and (B) substantially all other tangible and intangible assets of the Borrowers and the Revolver Guarantors including equipment, general intangibles, intercompany notes, insurance policies, investment property and intellectual property (in each case, except to the extent constituting Revolver Priority Collateral), but excluding real property (collectively, including certain material owned real property that does not constitute collateral under the Revolving Credit Agreement, the “Term Priority Collateral”). The respective priorities of the security interests securing the Revolving Credit Agreement and the Term Loan Credit Agreement are governed by an Intercreditor Agreement, dated as of May 8, 2012, between the Revolver Agent and the Term Agent (as defined below), as amended (the “Intercreditor Agreement”). The Revolving Credit Agreement has a scheduled maturity date of December 21, 2023, subject to certain springing maturity events. Under the Revolving Credit Agreement, the lenders agree to make available to the Company a $175 million revolving credit facility. The Company has the option to increase the total commitment under the facility to up to $275 million, subject to certain conditions, including obtaining commitments from any one or more lenders, whether or not currently party to the Revolving Credit Agreement, to provide such increased amounts. Availability under the Revolving Credit Agreement will be based upon quarterly (or more frequent under certain circumstances) borrowing base certifications of the Borrowers’ eligible inventory and eligible accounts receivable, and will be reduced by certain reserves in effect from time to time. Subject to availability, the Revolving Credit Agreement provides for a letter of credit subfacility in an amount not in excess of $15 million, and allows for swingline loans in an amount not in excess of $17.5 million. Outstanding borrowings under the Revolving Credit agreement will bear interest at an annual rate, at the Borrowers’ election, equal to (i) LIBOR plus a margin ranging from 1.25% to 1.75% or (ii) a base rate plus a margin ranging from 0.25% to 0.75%, in each case depending upon the monthly average excess availability under the revolving loan facility. The Borrowers are required to pay a monthly unused line fee equal to 0.20% times the average daily unused availability along with other customary fees and expenses of the Revolver Agent and the lenders. The Revolving Credit Agreement contains customary covenants limiting the ability of the Company and certain of its affiliates to, among other things, pay cash dividends, incur debt or liens, redeem or repurchase stock, enter into transactions with affiliates, merge, dissolve, repay subordinated indebtedness, make investments and dispose of assets. In addition, the Company will be required to maintain a minimum fixed charge coverage ratio of not less than 1.0 to 1.0 as of the end of any period of 12 fiscal months when excess availability under the Revolving Credit Agreement is less than 10% of the total revolving commitment. If availability under the Revolving Credit Agreement is less than 15% of the total revolving commitment or if there exists an event of default, amounts in any of the Borrowers’ and the Revolver Guarantors’ deposit accounts (other than certain excluded accounts) will be transferred daily into a blocked account held by the Revolver Agent and applied to reduce the outstanding amounts under the facility. Subject to the terms of the Intercreditor Agreement, if the covenants under the Revolving Credit Agreement are breached, the lenders may, subject to various customary cure rights, require the immediate payment of all amounts outstanding and foreclose on collateral. Other customary events of default in the Revolving Credit Agreement include, without limitation, failure to pay obligations when due, initiation of insolvency proceedings, defaults on certain other indebtedness, and the incurrence of certain judgments that are not stayed, satisfied, bonded or discharged within 30 days. In connection with the Second Amended and Restated Credit Agreement, the Company recognized a loss on debt extinguishment of $0.1 million during 2018, which is included in Other, net on the Company’s Consolidated Statements of Operations. The Company’s liquidity position, defined as cash on hand and available borrowing capacity on the Revolving Credit Facility, amounted to $384.0 million as of December 31, 2020 and $308.1 million as of December 31, 2019. During the three-month period ended March 31, 2020, the Company drew $45.0 million under the Revolving Credit Agreement as a precautionary measure in response to the uncertainty caused by the COVID-19 pandemic. During the second quarter of 2020, the Company repaid the $45.0 million in outstanding borrowings, and for the remainder of 2020 and as of December 31, 2020 and 2019 there were no amounts outstanding under the Revolving Facility. The Company was in compliance with all covenants as of December 31, 2020. Interest expense under the Revolving Credit Agreement for the year ended December 31, 2020, was approximately $0.2 million. There was no interest expense under the Revolving Credit Agreement for years ended December 31, 2019 and December 31, 2018. New and Old Term Loan Credit Agreements On September 28, 2020, the Company entered into a Term Loan Credit Agreement (the “New Term Loan Credit Agreement”) among the Company, the lenders from time to time party thereto, and Wells Fargo Bank, National Association, as the administrative agent (the “Term Agent”), providing for a senior secured term loan facility of $150.0 million that was advanced at closing. The New Term Loan Credit Agreement refinanced and replaced that certain Term Loan Credit Agreement, dated as of May 8, 2012 (as amended, restated, supplemented, or otherwise modified from time to time, the “Old Term Loan Credit Agreement”), among the Company, the lenders party thereto and Morgan Stanley Senior Funding, Inc., as the administrative agent. The New Term Loan Credit Agreement is guaranteed by certain subsidiaries of the Company (the “Term Loan Guarantors”) and is secured by (i) second priority security interests (subject only to the liens securing the Revolving Credit Agreement, customary permitted liens, and certain other permitted liens) in substantially all personal property of the Company and the Term Loan Guarantors, consisting of accounts receivable, inventory, cash, deposit and securities accounts and any cash or other assets in such accounts and, to the extent evidencing or otherwise related to such property, all general intangibles, licenses, intercompany debt, letter of credit rights, commercial tort claims, chattel paper, instruments, supporting obligations, documents and payment intangibles, and (ii) first priority security interests (subject only to customary permitted liens and certain other permitted liens) in (A) subject to certain limitations, equity interests of each direct subsidiary held by the Company and each Term Loan Guarantor, and (B) substantially all other tangible and intangible assets of the Company and the Term Loan Guarantors, including equipment, general intangibles, intercompany notes, investment property and intellectual property, but excluding real property. The respective priorities of the security interests securing the New Term Loan Credit Agreement and the Revolving Credit Agreement are governed by an Intercreditor Agreement, dated as of September 28, 2020, between the Term Agent and the Revolver Agent (the “Intercreditor Agreement”). The New Term Loan Credit Agreement has a scheduled maturity date of September 28, 2027. The loans under the New Term Loan Credit Agreement amortize in quarterly installments equal to 0.25% of the original principal amount of the term loans issued thereunder, with the balance payable at maturity. Outstanding borrowings under the New Term Loan Credit Agreement bear interest at a rate, at the Company’s election, equal to (i) LIBOR (subject to a floor of 0.75% per annum) plus a margin of 3.25% per annum or (ii) a base rate plus a margin of 2.25% per annum. The New Term Loan Credit Agreement contains customary covenants limiting the ability of the Company and its subsidiaries to, among other things, pay cash dividends, incur debt or liens, redeem or repurchase stock, enter into transactions with affiliates, merge, dissolve, pay off subordinated indebtedness, make investments and dispose of assets. As of December 31, 2020, the Company was in compliance with all covenants. Subject to the terms of the Intercreditor Agreement, if the covenants under the New Term Loan Credit Agreement are breached, the lenders may, subject to various customary cure rights, require the immediate payment of all amounts outstanding and foreclose on collateral. Other customary events of default in the New Term Loan Credit Agreement include, without limitation, failure to pay obligations when due, initiation of insolvency proceedings, defaults on certain other indebtedness, and the incurrence of certain judgments that are not stayed, satisfied, bonded or discharged within 60 days. The Company used the net proceeds of $148.5 million from the New Term Loan Credit Agreement to pay off the outstanding principal under the Old Term Loan Credit Agreement of $135.2 million, repay a portion of its outstanding Senior Notes, and pay related fees and expenses. In connection with the pay off of the Old Term Loan Credit Agreement (specifically for those lenders that did not participate in the New Term Loan Credit Agreement) and partial repayment of the outstanding Senior Notes, the Company recognized a loss on debt extinguishment totaling approximately $0.2 million, which is included in Other, net in the Consolidated Statements of Operations. As further described in Note 20, during the fourth quarter of 2020 the Company sold its Beall ® brand of tank trailers and associated assets. The net proceeds of approximately $11.2 million from the sale were used to pay down outstanding principal under the New Term Loan Credit Agreement. In connection with the pay down the Company recognized a loss on debt extinguishment totaling approximately $0.2 million. The Company’s required quarterly principal payments through maturity under the New Term Load Credit Agreement were satisfied in full with this prepayment. For the years ended December 31, 2020, 2019, and 2018, under the New and Old Term Loan Credit Agreements the Company paid interest of $4.8 million, $7.8 million, and $8.0 million, respectively. For the years ended December 31, 2019 and 2018 the Company paid principal of $50.5 million, and $1.9 million, respectively. During 2020, 2019, and 2018, the Company recognized losses on debt extinguishment totaling approximately $0.4 million, $0.2 million, and $0.3 million, respectively, in connection with the New Term Loan Credit Agreement activity described above and prepayment of principal. The losses on debt extinguishment are included in Other, net on the Company’s Consolidated Statements of Operations. As of December 31, 2020 and December 31, 2019, the Company had $138.8 million and $135.2 million outstanding under the New and Old Term Loan Credit Agreements, respectively, of which none was classified as current on the Company’s Consolidated Balance Sheets. For the years ended December 31, 2020, 2019, and 2018, the Company incurred charges of $0.2 million in each period for amortization of fees and original issuance discount which is included in Interest expense in the Consolidated Statements of Operations. Convertible Senior Notes In April 2012, the Company issued Convertible Senior Notes due 2018 (the “Convertible Notes”) with an aggregate principal amount of $150 million in a public offering. The Convertible Notes bear interest at a rate of 3.375% per annum from the date of issuance, payable semi-annually on May 1 and November 1, and matured on May 1, 2018. The Convertible Notes were senior unsecured obligations of the Company ranking equally with its existing and future senior unsecured debt. The Company used the net proceeds of $145.1 million from the sale of the Convertible Notes to fund a portion of the purchase price of the acquisition of Walker Group Holdings (“Walker”) in May 2012. The Company accounted separately for the liability and equity components of the Convertible Notes in accordance with authoritative guidance for convertible debt instruments that may be settled in cash upon conversion. During 2018, the Company used $80.2 million in cash, excluding interest, to settle $44.6 million in principal of the Convertible Notes of which none were converted to common shares. The excess of the cash settlement amount over the principal value of the Convertible Notes was accounted for as a reacquisition of equity, resulting in a $35.5 million reduction to additional paid-in capital during 2018. For the year ended December 31, 2018, we recognized a loss on debt extinguishment of $0.2 million related to settlements and the retirement of the Convertible Notes, which is included in Other, net on the Company’s Consolidated Statements of Operations. Contractual coupon interest expense and accretion of discount and fees on the liability component for the Convertible Notes for the years ended December 31, 2020, 2019, and 2018 included in Interest expense on the Company’s Consolidated Statements of Operations were as follows (in thousands): Year Ended December 31, 2020 2019 2018 Contractual coupon interest expense $ — $ — $ 470 Accretion of discount and fees on the liability component $ — $ — $ 461

FINANCIAL DERIVATIVE INSTRUMENT

FINANCIAL DERIVATIVE INSTRUMENTS	12 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
FINANCIAL DERIVATIVE INSTRUMENTS	FINANCIAL DERIVATIVE INSTRUMENTS Commodity Pricing Risk As of December 31, 2020, the Company was party to commodity swap contracts for specific commodities with notional amounts of approximately $86.9 million. The Company uses commodity swap contracts to mitigate the risks associated with fluctuations in commodity prices impacting its cash flows related to inventory purchases from suppliers. The Company does not hedge all commodity price risk. At inception, the Company designated the commodity swap contracts as cash flow hedges. The contracts mature at specified monthly settlement dates through January 2022. The change in fair value effective portion of the hedging transaction is recognized in Accumulated Other Comprehensive Income (Loss) (“AOCI”) and transferred to earnings when the forecasted hedged transaction takes place or when the forecasted hedged transaction is no longer probable to occur. Financial Statement Presentation As of December 31, 2020 and 2019, the fair value carrying amount of the Company’s derivative instruments were recorded as follows (in thousands): Asset / (Liability) Derivatives Balance Sheet Caption December 31, 2020 December 31, 2019 Derivatives designated as hedging instruments Commodity swap contracts Prepaid expenses and other $ 13,750 $ 1,290 Commodity swap contracts Accounts payable and Other accrued liabilities (366) (3,216) Total derivatives designated as hedging instruments $ 13,384 $ (1,926) The following table summarizes the gain or loss recognized in AOCI as of December 31, 2020 and 2019 and the amounts reclassified from AOCI into earnings for the years ended December 31, 2020, 2019, and 2018 (in thousands): Amount of Gain (Loss) Recognized in Location of Gain (Loss) Reclassified from AOCI into Earnings Amount of Gain (Loss) Reclassified from AOCI into Earnings Year Ended December 31, December 31, 2020 December 31, 2019 2020 2019 2018 Derivatives instruments Commodity swap contracts $ 9,815 $ (2,112) Cost of sales $ (7,778) $ (2,297) $ 142 Over the next 12 months, the Company expects to reclassify approximately $12.8 million of pretax deferred gains related to the commodity swap contracts from AOCI to cost of sales as inventory purchases are settled.

LEASES

LEASES	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
LEASES	LEASES The Company records a right-of-use ("ROU") asset and lease liability for substantially all leases for which it is a lessee, in accordance with ASC 842. Leases with an initial term of 12 months or less are not recorded on the balance sheet; the Company recognizes lease expense for these leases on a straight-line basis over the lease term. The Company has no significant lease agreements in place for which the Company is a lessor. At inception of a contract, the Company considers all relevant facts and circumstances to assess whether or not the contract represents a lease by determining whether or not the contract conveys the right to control the use of an identified asset, either explicit or implicit, for a period of time in exchange for consideration. The Company leases certain industrial spaces, office space, land, and equipment. Some leases include one or more options to renew, with renewal terms that can extend the lease term from generally one Leased assets and liabilities included within the Consolidated Balance Sheets consist of the following (in thousands): Classification December 31, 2020 December 31, 2019 Right-of-Use Assets Operating Other assets $ 10,842 $ 14,246 Finance Property, plant and equipment, net 2,802 2,945 Total leased ROU assets $ 13,644 $ 17,191 Liabilities Current Operating Other accrued liabilities $ 4,117 $ 4,369 Finance Current portion of finance lease obligations 348 327 Noncurrent Operating Non-current liabilities 6,967 10,041 Finance Finance lease obligations 30 378 Total lease liabilities $ 11,462 $ 15,115 Lease costs included in the Consolidated Statements of Operations consist of the following (in thousands): Classification Twelve Months Ended December 31, 2020 Twelve Months Ended December 31, 2019 Operating lease cost Cost of sales, selling expenses and general and administrative expense $ 5,116 $ 5,172 Finance lease cost Amortization of ROU leased assets Depreciation and amortization within Cost of sales 144 144 Interest on lease liabilities Interest expense 53 65 Net lease cost $ 5,313 $ 5,381 Maturity of the Company’s lease liabilities for leases that have commenced is as follows (in thousands): Operating Leases Finance Leases Total 2021 $ 4,569 $ 361 $ 4,930 2022 3,040 30 3,070 2023 2,185 — 2,185 2024 1,085 — 1,085 2025 537 — 537 Thereafter 721 — 721 Total lease payments $ 12,137 $ 391 $ 12,528 Less: interest 1,053 13 Present value of lease payments $ 11,084 $ 378 As most of the Company’s leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. Remaining lease term and discount rates are as follows: December 31, 2020 December 31, 2019 Weighted average remaining lease term (years) Operating leases 3.6 4.0 Finance leases 1.1 2.1 Weighted average discount rate Operating leases 5.07 % 5.17 % Finance leases 6.16 % 6.16 % Lease costs included in the Consolidated Statements of Cash Flows are as follows (in thousands): Twelve Months Ended December 31, 2020 Twelve Months Ended December 31, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 5,091 $ 5,016 Operating cash flows from finance leases $ 34 $ 53 Financing cash flows from finance leases $ 327 $ 308
LEASES	LEASES The Company records a right-of-use ("ROU") asset and lease liability for substantially all leases for which it is a lessee, in accordance with ASC 842. Leases with an initial term of 12 months or less are not recorded on the balance sheet; the Company recognizes lease expense for these leases on a straight-line basis over the lease term. The Company has no significant lease agreements in place for which the Company is a lessor. At inception of a contract, the Company considers all relevant facts and circumstances to assess whether or not the contract represents a lease by determining whether or not the contract conveys the right to control the use of an identified asset, either explicit or implicit, for a period of time in exchange for consideration. The Company leases certain industrial spaces, office space, land, and equipment. Some leases include one or more options to renew, with renewal terms that can extend the lease term from generally one Leased assets and liabilities included within the Consolidated Balance Sheets consist of the following (in thousands): Classification December 31, 2020 December 31, 2019 Right-of-Use Assets Operating Other assets $ 10,842 $ 14,246 Finance Property, plant and equipment, net 2,802 2,945 Total leased ROU assets $ 13,644 $ 17,191 Liabilities Current Operating Other accrued liabilities $ 4,117 $ 4,369 Finance Current portion of finance lease obligations 348 327 Noncurrent Operating Non-current liabilities 6,967 10,041 Finance Finance lease obligations 30 378 Total lease liabilities $ 11,462 $ 15,115 Lease costs included in the Consolidated Statements of Operations consist of the following (in thousands): Classification Twelve Months Ended December 31, 2020 Twelve Months Ended December 31, 2019 Operating lease cost Cost of sales, selling expenses and general and administrative expense $ 5,116 $ 5,172 Finance lease cost Amortization of ROU leased assets Depreciation and amortization within Cost of sales 144 144 Interest on lease liabilities Interest expense 53 65 Net lease cost $ 5,313 $ 5,381 Maturity of the Company’s lease liabilities for leases that have commenced is as follows (in thousands): Operating Leases Finance Leases Total 2021 $ 4,569 $ 361 $ 4,930 2022 3,040 30 3,070 2023 2,185 — 2,185 2024 1,085 — 1,085 2025 537 — 537 Thereafter 721 — 721 Total lease payments $ 12,137 $ 391 $ 12,528 Less: interest 1,053 13 Present value of lease payments $ 11,084 $ 378 As most of the Company’s leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. Remaining lease term and discount rates are as follows: December 31, 2020 December 31, 2019 Weighted average remaining lease term (years) Operating leases 3.6 4.0 Finance leases 1.1 2.1 Weighted average discount rate Operating leases 5.07 % 5.17 % Finance leases 6.16 % 6.16 % Lease costs included in the Consolidated Statements of Cash Flows are as follows (in thousands): Twelve Months Ended December 31, 2020 Twelve Months Ended December 31, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 5,091 $ 5,016 Operating cash flows from finance leases $ 34 $ 53 Financing cash flows from finance leases $ 327 $ 308

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS The Company’s fair value measurements are based upon a three-level valuation hierarchy. These valuation techniques are based upon the transparency of inputs (observable and unobservable) to the valuation of an asset or liability as of the measurement date. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect the Company’s market assumptions. These two types of inputs create the following fair value hierarchy: ▪ Level 1 — Valuation is based on quoted prices for identical assets or liabilities in active markets; ▪ Level 2 — Valuation is based on quoted prices for similar assets or liabilities in active markets, or other inputs that are observable for the asset or liability, either directly or indirectly, for the full term of the financial instrument; and ▪ Level 3 — Valuation is based upon other unobservable inputs that are significant to the fair value measurement. Recurring Fair Value Measurements The Company maintains a non-qualified deferred compensation plan which is offered to senior management and other key employees. The amount owed to participants is an unfunded and unsecured general obligation of the Company. Participants are offered various investment options with which to invest the amount owed to them, and the plan administrator maintains a record of the liability owed to participants by investment. To minimize the impact of the change in market value of this liability, the Company has elected to purchase a separate portfolio of investments through the plan administrator similar to those chosen by the participant. The investments purchased by the Company include mutual funds, which are classified as Level 1, and life-insurance contracts valued based on the performance of underlying mutual funds, which are classified as Level 2. Additionally, upon the Company’s acquisition of Supreme, the Company acquired a pool of investments made by a wholly owned captive insurance subsidiary. These investments are comprised of mutual funds, which are classified as Level 1. The fair value of the Company’s derivatives is estimated with a market approach using third-party pricing services, which have been corroborated with data from active markets or broker quotes. Fair value measurements and the fair value hierarchy level for the Company’s assets and liabilities measured at fair value on a recurring basis as of December 31, 2020 are shown below (in thousands): Frequency Asset / (Liability) Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs December 31, 2020 Commodity swap contracts Recurring $ 13,384 $ — $ 13,384 $ — Mutual funds Recurring $ 5,331 $ 5,331 $ — $ — Life-insurance contracts Recurring $ 16,930 $ — $ 16,930 $ — December 31, 2019 Commodity swap contracts Recurring $ (1,926) $ — $ (1,926) $ — Mutual funds Recurring $ 7,367 $ 7,367 $ — $ — Life-insurance contracts Recurring $ 15,072 $ — $ 15,072 $ — Estimated Fair Value of Debt The estimated fair value of debt at December 31, 2020 consists primarily of the Senior Notes due 2025 and borrowings under the New Term Loan Credit Agreement (see Note 9). The fair value of the Senior Notes due 2025, New Term Loan Credit Agreement, and Old Term Loan Credit Agreement are based upon third party pricing sources, which generally do not represent daily market activity or represent data obtained from an exchange, and are classified as Level 2. The interest rates on the Company’s borrowings under the Revolving Credit Facility are adjusted regularly to reflect current market rates and thus carrying value approximates fair value for any borrowings. All other debt approximates their fair value as determined by discounted cash flows and are classified as Level 3. The Company’s carrying and estimated fair value of debt at December 31, 2020 and December 31, 2019 were as follows (in thousands): December 31, 2020 December 31, 2019 Fair Value Fair Value Carrying Level 1 Level 2 Level 3 Carrying Level 1 Level 2 Level 3 Instrument Senior Notes due 2025 $ 311,357 $ — $ 319,140 $ — $ 320,572 $ — $ 320,572 $ — New (2020) & Old (2019) Term Loan Credit Agreements 136,622 — 136,280 — 134,814 — 134,814 — $ 447,979 $ — $ 455,420 $ — $ 455,386 $ — $ 455,386 $ —

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES a. Litigation As of December 31, 2020, the Company was named as a defendant or was otherwise involved in numerous legal proceedings and governmental examinations, in connection with the conduct of its business activities, in various jurisdictions, both in the United States and internationally. On the basis of information currently available to it, management does not believe that existing proceedings and investigations will have a material impact on our consolidated financial condition or liquidity if determined in a manner adverse to the Company. However, such matters are unpredictable, and we could incur judgments or enter into settlements for current or future claims that could materially and adversely affect our financial statements. Costs associated with the litigation and settlements of legal matters are reported within General and administrative expenses in the Consolidated Statements of Operations. Environmental Disputes In August 2014, the Company received notice as a potentially responsible party (“PRP”) by the South Carolina Department of Health and Environmental Control (the “DHEC”) pertaining to the Philip Services Site located in Rock Hill, South Carolina pursuant to the Comprehensive Environmental Response, Compensation and Liability Act (“CERCLA”) and corresponding South Carolina statutes. PRPs include parties identified through manifest records as having contributed to deliveries of hazardous substances to the Philip Services Site between 1979 and 1999. The DHEC’s allegation that the Company was a PRP arises out of four manifest entries in 1989 under the name of a company unaffiliated with Wabash National (or any of its former or current subsidiaries) that purport to be delivering a de minimis amount of hazardous waste to the Philip Services Site “c/o Wabash National Corporation.” As such, the Philip Services Site PRP Group (the “PRP Group”) notified Wabash in August 2014 that it was offering the Company the opportunity to resolve any liabilities associated with the Philip Services Site by entering into a Cash Out and Reopener Settlement Agreement (the “Settlement Agreement”) with the PRP Group, as well as a Consent Decree with the DHEC. The Company has accepted the offer from the PRP Group to enter into the Settlement Agreement and Consent Decree, while reserving its rights to contest its liability for any deliveries of hazardous materials to the Philips Services Site. The requested settlement payment is immaterial to the Company’s financial conditions and results of operations, and as a result, if the Settlement Agreement and Consent Decree are finalized, the payment to be made by the Company thereunder is not expected to have a material adverse effect on the Company’s financial condition or results of operations. On November 13, 2019, the Company received a notice that it was considered one of several PRPs by the Indiana Department of Environmental Management (“IDEM”) under CERCLA and state law related to substances found in soil and groundwater at a property located at 817 South Earl Avenue, Lafayette, Indiana (the “Site”). The Company has never owned or operated the Site, but the Site is near certain of the Company’s owned properties. The Company has agreed to implement a limited work plan to further investigate the source of the contamination at the Site and have worked with IDEM and other PRPs to finalize the terms of the work plan. The Company submitted its initial site investigation report to IDEM during the third quarter of 2020, indicating that the data collected by the Company’s consultant confirmed that the Company’s properties are not the source of contamination at the Site. IDEM issued to the PRPs a request for a Further Site Investigation (“FSI”) work plan, and with IDEM’s permission the Company submitted a Work Plan Addendum on December 17, 2020 for limited additional groundwater sampling work in lieu of a full FSI work plan. IDEM approved the Work Plan Addendum, and the additional work will be conducted in the first quarter of 2021. As of December 31, 2020, based on the information available, the Company does not expect this matter to have a material adverse effect on its financial condition or results of operations. b. Environmental Litigation Commitments and Contingencies The Company generates and handles certain material, wastes and emissions in the normal course of operations that are subject to various and evolving federal, state and local environmental laws and regulations. The Company assesses its environmental liabilities on an on-going basis by evaluating currently available facts, existing technology, presently enacted laws and regulations as well as experience in past treatment and remediation efforts. Based on these evaluations, the Company estimates a lower and upper range for treatment and remediation efforts and recognizes a liability for such probable costs based on the information available at the time. As of December 31, 2020, the Company had reserved estimated remediation costs of $0.1 million for activities at existing and former properties which are recorded within Other accrued liabilities on the Consolidated Balance Sheets. c. Letters of Credit As of December 31, 2020, the Company had standby letters of credit totaling $6.8 million issued in connection with workers compensation claims and surety bonds. d. Purchase Commitments The Company has $86.9 million in purchase commitments at December 2020 for various raw material commodities, including aluminum, steel, nickel, and polyethylene, as well as other raw material components which are within normal production requirements. e. Chassis Converter Pool Agreements The Company, through Supreme, obtains most vehicle chassis for its specialized vehicle products directly from the chassis manufacturers under converter pool agreements. Chassis are obtained from the manufacturers based on orders from customers, and in some cases, for unallocated orders. The agreements generally state that the manufacturer will provide a supply of chassis to be maintained at the Company’s facilities with the condition that we will store such chassis and will not move, sell, or otherwise dispose of such chassis except under the terms of the agreement. In addition, the manufacturer typically retains the sole authority to authorize commencement of work on the chassis and to make certain other decisions with respect to the chassis including the terms and pricing of sales of the chassis to the manufacturer’s dealers. The manufacturer also does not transfer the certificate of origin to the Company nor permit the Company to sell or transfer the chassis to anyone other than the manufacturer (for ultimate resale to a dealer). Although the Company is party to related finance agreements with manufacturers, the Company has not historically settled, nor expects to in the future settle, any related obligations in cash. Instead, the obligation is settled by the manufacturer upon reassignment of the chassis to an accepted dealer, and the dealer is invoiced for the chassis by the manufacturer. Accordingly, as of December 31, 2020 the Company’s outstanding chassis converter pool with the manufacturer totaled $17.8 million and has included this financing agreement on the Company’s Consolidated Balance Sheets within Prepaid expenses and other and Other accrued liabilities . All other chassis programs through its Supreme subsidiary are handled as consigned inventory belonging to the manufacturer and totaled approximately $2.6 million. Under these agreements, if the chassis is not delivered to a customer within a specified time frame the Company is required to pay a finance or storage charge on the chassis. Additionally, the Company receives finance support funds from manufacturers when the chassis are assigned into the Company’s chassis pool. Typically, chassis are converted and delivered to customers within 90 days of the receipt of the chassis by the Company.

PER SHARE OF COMMON STOCK

PER SHARE OF COMMON STOCK	12 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
PER SHARE OF COMMON STOCK	PER SHARE OF COMMON STOCK Basic earnings per share is calculated based on the weighted average number of common shares outstanding during the period. Diluted earnings per share is determined based on the weighted average number of common shares outstanding during the period combined with the incremental average common shares that would have been outstanding assuming the conversion of all potentially dilutive common shares into common shares as of the earliest date possible. The calculation of basic and diluted net (loss) income per share is determined using net (loss) income applicable to common stockholders as the numerator and the number of shares included in the denominator as shown below (in thousands, except per share amounts). Due to the net loss applicable to common stockholders for the year ended December 31, 2020, no securities had a dilutive impact. Year Ended December 31, 2020 2019 2018 Basic net (loss) income per share: Net (loss) income applicable to common stockholders $ (97,412) $ 89,575 $ 69,421 Weighted average common shares outstanding 52,945 54,695 56,996 Basic net (loss) income per share $ (1.84) $ 1.64 $ 1.22 Diluted net (loss) income per share: Net (loss) income applicable to common stockholders $ (97,412) $ 89,575 $ 69,421 Weighted average common shares outstanding 52,945 54,695 56,996 Dilutive shares from assumed conversion of convertible senior notes — — 455 Dilutive stock options and restricted stock — 595 979 Diluted weighted average common shares outstanding 52,945 55,290 58,430 Diluted net (loss) income per share $ (1.84) $ 1.62 $ 1.19 As noted above, due to the net loss applicable to common stockholders for the year ended December 31, 2020, no securities had a dilutive impact. For the years ended December 31, 2019 and 2018, there were no options excluded from average diluted shares outstanding as the average market price of the common shares was greater than the exercise price. In addition, the calculation of diluted net income per share for the year ending December 31, 2018 includes the impact of the Company’s Convertible Senior Notes as the average stock price of the Company’s common stock during this period was above the initial

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION	12 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract]
STOCK-BASED COMPENSATION	STOCK-BASED COMPENSATION On May 18, 2017, the shareholders of the Company approved the 2017 Omnibus Incentive Plan (the “2017 Incentive Plan”) which authorizes 3,150,000 shares for issuance under the plan. Awards granted under the 2017 Incentive Plan may be in the form of stock options, stock appreciation rights, restricted stock, restricted stock units, other share-based awards, and cash awards to directors, officers, and other eligible employees of the Company. The Company recognizes all share-based awards to eligible employees based upon their fair value. The Company’s policy is to recognize expense for awards that have service conditions only subject to graded vesting using the straight-line attribution method. Total stock-based compensation expense was $4.5 million, $9.0 million, and $10.2 million in the years ended December 31, 2020, 2019 and 2018, respectively, and is included in Cost of sales , General and administrative expenses , and Selling expenses within the Consolidated Statements of Operations. The amount of compensation costs related to nonvested stock options and restricted stock not yet recognized was approximately $10.9 million at December 31, 2020, for which the weighted average remaining life was 1.8 years. Restricted Stock Restricted stock awards vest over a period of one A summary of all restricted stock activity during 2020 is as follows: Number of Weighted Restricted Stock Outstanding at December 31, 2019 1,691,699 $ 20.24 Granted 1,010,802 12.43 Vested (314,048) 19.60 Forfeited (556,074) 20.56 Restricted Stock Outstanding at December 31, 2020 1,832,379 $ 16.06 During 2020, 2019, and 2018, the Company granted 1,010,802, 853,994 and 593,705 shares of restricted stock, respectively, with aggregate fair values on the date of grant of $12.6 million, $13.0 million, and $14.6 million, respectively. The total fair value of restricted stock that vested during 2020, 2019, and 2018 was $3.7 million, $7.4 million and $15.0 million, respectively. Stock Options Stock options are awarded with an exercise price equal to the market price of the underlying stock on the date of grant, become fully exercisable three years after the date of grant and expire ten years after the date of grant. No stock options have been granted by the Company since February 2015. A summary of all stock option activity during 2020 is as follows: Number of Options Weighted Average Exercise Price Weighted Average Remaining Contractual Life Aggregate Options Outstanding at December 31, 2019 531,942 $ 11.54 3.1 $ 1.7 Exercised (113,312) $ 11.24 $ 0.5 Forfeited — $ — Expired (4,550) $ 13.74 Options Outstanding at December 31, 2020 414,080 $ 11.60 2.2 $ 2.3 Options Exercisable at December 31, 2020 368,333 $ 11.67 2.3 $ 2.0

STOCKHOLDERS' EQUITY

STOCKHOLDERS' EQUITY	12 Months Ended
	Dec. 31, 2020
Stockholders' Equity Note [Abstract]
STOCKHOLDERS' EQUITY	STOCKHOLDERS’ EQUITY Share Repurchase Program In November 2018, the Company announced that the Board of Directors approved the repurchase of an additional $100 million in shares of common stock over a three-year period. This authorization was an increase to the previous $100 million repurchase programs approved in February 2017 and February 2016. The repurchase program is set to expire on February 28, 2022. Stock repurchases under this program may be made in the open market or in private transactions at times and in amounts determined by the Company. As of December 31, 2020, $51.4 million remained available under the program. Common and Preferred Stock The Board of Directors has the authority to issue common and unclassed preferred stock of up to 200 million shares and 25 million shares, respectively, with par value of $0.01 per share, as well as to fix dividends, voting and conversion rights, redemption provisions, liquidation preferences, and other rights and restrictions. Accumulated Other Comprehensive (Loss) Income Changes in AOCI by component, net of tax, for the years ended December 31, 2020, 2019, and 2018 are summarized as follows (in thousands): Foreign Currency Translation Derivative Instruments Total Balances at December 31, 2017 $ (2,385) $ — $ (2,385) Net unrealized gains (losses) arising during the period (a) (193) (660) (853) Less: Net realized gains (losses) reclassified to net income (b) — 105 105 Net change during the period (193) (765) (958) Balances at December 31, 2018 (2,578) (765) (3,343) Net unrealized gains (losses) arising during the period (c) 712 (3,059) (2,347) Less: Net realized gains (losses) reclassified to net income (d) — (1,712) (1,712) Net change during the period 712 (1,347) (635) Balances at December 31, 2019 (1,866) (2,112) (3,978) Net unrealized gains (losses) arising during the period (e) (316) 6,111 5,795 Less: Net realized gains (losses) reclassified to net loss (f) — (5,816) (5,816) Net change during the period (316) 11,927 11,611 Balances at December 31, 2020 $ (2,182) $ 9,815 $ 7,633 ————————— (a) Derivative instruments net of $230 thousand of tax benefit for the year ended December 31, 2018. (b) Derivative instruments net of $37 thousand of tax expense for the year ended December 31, 2018. (c) Derivative instruments net of $1,031 thousand of tax benefit for the year ended December 31, 2019. (d) Derivative instruments net of $585 thousand of tax benefit for the year ended December 31, 2019. (e) Derivative instruments net of $2,058 thousand of tax expense for the year ended December 31, 2020. (f) Derivative instruments net of $1,962 thousand of tax benefit for the year ended December 31, 2020.

EMPLOYEE SAVINGS PLANS

EMPLOYEE SAVINGS PLANS	12 Months Ended
	Dec. 31, 2020
Employee Savings Plans [Abstract]
EMPLOYEE SAVINGS PLANS	EMPLOYEE SAVINGS PLANSSubstantially all of the Company’s employees are eligible to participate in a defined contribution plan under Section 401(k) of the Internal Revenue Code. The Company also provides a non-qualified defined contribution plan for senior management and certain key employees. Both plans provide for the Company to match, in cash, a percentage of each employee’s contributions up to certain limits. The Company’s matching contribution and related expense for these plans was approximately $7.9 million, $10.2 million, and $7.9 million for 2020, 2019, and 2018, respectively.

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES (Loss) Income Before Income Taxes The consolidated (loss) income before income taxes for 2020, 2019, and 2018 consists of the following (in thousands): Years Ended December 31, 2020 2019 2018 Domestic $ (110,049) $ 116,886 $ 94,978 Foreign 835 845 1,026 Total (loss) income before income taxes $ (109,214) $ 117,731 $ 96,004 Income Tax (Benefit) Expense On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”) was enacted and signed into law in response to the COVID-19 global pandemic. Certain provisions of the CARES Act had a significant impact on the effective tax rate, income tax payable, and deferred income tax positions of the Company for 2020. The CARES Act permits net operating losses (“NOLs”) incurred in tax years 2020, 2019, and 2018 to offset 100% of taxable income and be carried-back to each of the five preceding taxable years to generate a refund of previously paid income taxes. The Company evaluated the impact of the CARES Act during the year ended December 31, 2020 and recorded an income tax receivable of $13.2 million for the benefit of carrying back the NOL for the year ended December 31, 2020. As the Company is carrying the losses back to years beginning before January 1, 2018, the receivables were recorded at the previous 35% federal tax rate rather than the current statutory rate of 21%. The consolidated income tax (benefit) expense for 2020, 2019, and 2018 consists of the following components (in thousands): Years Ended December 31, 2020 2019 2018 Current Federal $ (15,190) $ 18,167 $ 22,120 State (2,072) 6,233 7,271 Foreign 444 336 168 (16,818) 24,736 29,559 Deferred Federal 7,918 2,760 (1,613) State (2,959) 620 (1,312) Foreign 57 40 (51) 5,016 3,420 (2,976) Total consolidated (benefit) expense $ (11,802) $ 28,156 $ 26,583 The following table provides a reconciliation of differences from the U.S. Federal statutory rates as follows (in thousands): Years Ended December 31, 2020 2019 2018 Pretax book (loss) income $ (109,214) $ 117,731 $ 96,004 Federal tax (benefit) expense at applicable statutory rate (22,935) 24,723 20,161 State and local income taxes (net of federal benefit) (4,948) 5,513 4,737 Rate differential (5,004) — — Goodwill impairment 20,111 — — Tax credits — (3,301) — Remeasurement of deferred taxes — — (421) Nondeductible officer compensation 490 — 1,152 Compensation expense 1,070 1,317 (1,009) Other (586) (96) 1,963 Total income tax (benefit) expense $ (11,802) $ 28,156 $ 26,583 Deferred Taxes The Company’s deferred income taxes are primarily due to temporary differences between financial and income tax reporting for incentive compensation, depreciation of property, plant and equipment, amortization of intangibles, and other accrued liabilities. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some portion or all of the deferred tax assets will not be realized. Companies are required to assess whether valuation allowances should be established against their deferred tax assets based on the consideration of all available evidence, both positive and negative, using a “more likely than not” standard. In making such judgments, significant weight is given to evidence that can be objectively verified. The Company assesses, on a quarterly basis, the realizability of its deferred tax assets by evaluating all available evidence, both positive and negative, including: (1) the cumulative results of operations in recent years, (2) the nature of recent losses, if applicable, (3) estimates of future taxable income, (4) the length of net operating loss carryforwards (“NOLs”) and (5) the uncertainty associated with a possible change in ownership, which imposes an annual limitation on the use of these carryforwards. As of December 31, 2020 and 2019, the Company retained a valuation allowance of $1.0 million and $0.8 million, respectively, against deferred tax assets related to various state and local NOLs that are subject to restrictive rules for future utilization. As of December 31, 2020 and 2019, the Company had no U.S. federal tax NOLs. The Company incurred a net loss in 2020 and will fully utilize that loss in carrybacks. The Company had various multi-state income tax NOLs aggregating approximately $87.0 million which will expire between 2021 and 2041, if unused. The components of deferred tax assets and deferred tax liabilities as of December 31, 2020 and 2019 were as follows (in thousands): December 31, 2020 2019 Deferred tax assets Tax credits and loss carryforwards $ 2,518 $ 672 Accrued liabilities 6,415 7,489 Incentive compensation 9,202 14,420 Other 328 5,423 18,463 28,004 Deferred tax liabilities Property, plant and equipment (22,355) (17,899) Intangibles (40,043) (44,477) Other (1,822) (2,379) (64,220) (64,755) Net deferred tax liability before valuation allowances and reserves (45,757) (36,751) Valuation allowances (1,020) (825) Net deferred tax liability $ (46,777) $ (37,576) Tax Reserves The Company’s policy with respect to interest and penalties associated with reserves or allowances for uncertain tax positions is to classify such interest and penalties in Income tax (benefit) expense on the Consolidated Statements of Operations. As of December 31, 2020 and 2019, the total amount of unrecognized income tax benefits, including interest and penalties, was approximately $2.2 million and $2.1 million, respectively, all of which, if recognized, would impact the effective income tax rate of the Company. As of December 31, 2020 and 2019, the Company had recorded a total of $0.7 million and $0.7 million, respectively, of accrued interest and penalties related to uncertain tax positions. The Company expects no significant changes to the facts and circumstances underlying its reserves and allowances for uncertain income tax positions as reasonably possible during the next 12 months. As of December 31, 2020, the Company is subject to unexpired statutes of limitation for U.S. federal income taxes for the years 2017 through 2019. The Company is also subject to unexpired statutes of limitation for Indiana state income taxes for the years 2017 through 2019. A reconciliation of the beginning and ending amount of unrecognized tax benefits, excluding interest and penalties, was as follows (in thousands) and all balances as of December 31, 2020 were included in either Other noncurrent liabilities or Deferred income taxes in the Company’s Consolidated Balance Sheets: Unrecognized Tax Benefits Balance at January 1, 2019 $ 1,177 Increase in prior year tax positions 245 Balance at December 31, 2019 1,422 Increase in prior year tax positions 84 Balance at December 31, 2020 $ 1,506

SEGMENTS

SEGMENTS	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
SEGMENTS	SEGMENTS Segment Reporting The Company manages its business in three segments: Commercial Trailer Products, Diversified Products, and Final Mile Products. The Commercial Trailer Products segment manufactures standard and customized van and platform trailers and other transportation related equipment for customers who purchase directly from the Company or through independent dealers. The Diversified Products segment, comprised of three strategic business units including, Tank Trailers, Process Systems, and Composites, focuses on the Company’s commitment to expand its customer base and diversify its product offerings and revenues, and making available products that are complementary to truck and tank trailers and transportation equipment. The Final Mile Products segment manufactures truck bodies for customers in the final mile space. The accounting policies of the segments are the same as those described in the summary of significant accounting policies except that the Company generally evaluates segment performance based on (loss) income from operations. The Company has not allocated certain corporate related administrative costs, interest, and income taxes included in the corporate and eliminations segment to the Company’s other reportable segments. The Company accounts for intersegment sales and transfers at cost plus a specified mark-up. Reportable segment information is as follows (in thousands): Commercial Diversified Final Mile Corporate and Consolidated 2020 Net sales External customers $ 992,528 $ 270,963 $ 218,398 $ — $ 1,481,889 Intersegment sales 248 23,171 — (23,419) — Total net sales $ 992,776 $ 294,134 $ 218,398 $ (23,419) $ 1,481,889 Depreciation and amortization $ 11,557 $ 19,300 $ 14,891 $ 2,222 $ 47,970 Income (Loss) from operations $ 79,662 $ 1,563 $ (123,585) $ (43,248) $ (85,608) Assets $ 306,587 $ 278,643 $ 375,115 $ 201,125 $ 1,161,470 2019 Net sales External customers $ 1,519,592 $ 357,634 $ 441,910 $ — $ 2,319,136 Intersegment sales 1,949 26,882 — (28,831) — Total net sales $ 1,521,541 $ 384,516 $ 441,910 $ (28,831) $ 2,319,136 Depreciation and amortization $ 10,667 $ 18,621 $ 11,361 $ 1,708 $ 42,357 Income (Loss) from operations $ 145,877 $ 29,748 $ 9,804 $ (42,643) $ 142,786 Assets $ 362,328 $ 317,246 $ 511,862 $ 113,155 $ 1,304,591 2018 Net sales External customers $ 1,536,687 $ 372,342 $ 358,249 $ — $ 2,267,278 Intersegment sales 252 21,629 — (21,881) — Total net sales $ 1,536,939 $ 393,971 $ 358,249 $ (21,881) $ 2,267,278 Depreciation and amortization $ 9,631 $ 21,177 $ 8,314 $ 1,561 $ 40,683 Income (Loss) from operations $ 141,795 $ (3,033) $ 7,907 $ (35,682) $ 110,987 Assets $ 355,183 $ 349,423 $ 484,634 $ 115,153 $ 1,304,393 Customer Concentration The Company is subject to a concentration of risk as the five largest customers together accounted for approximately 21%, 27%, and 25% of the Company’s aggregate net sales in 2020, 2019, and 2018, respectively. In addition, for each of the last three years there were no customers whose revenue individually represented 10% or more of our aggregate net sales. International sales accounted for less than 10% in each of the last three years. Product Information The Company offers products primarily in four general categories: (1) new trailers, (2) used trailers, (3) components, parts and service, and (4) equipment and other. The following table sets forth the major product categories and their percentage of consolidated net sales (dollars in thousands): Year ended December 31, 2020 Commercial Trailer Products Diversified Products Final Mile Products Eliminations Consolidated New trailers $ 941,932 $ 145,888 $ — $ — $ 1,087,820 73.4% Used trailers 3,841 4,545 — — 8,386 0.6% Components, parts and service 36,912 88,010 12,517 (23,391) 114,048 7.7% Equipment and other 10,091 55,691 205,881 (28) 271,635 18.3% Total net external sales $ 992,776 $ 294,134 $ 218,398 $ (23,419) $ 1,481,889 100.0% Year ended December 31, 2019 Commercial Trailer Products Diversified Products Final Mile Products Eliminations Consolidated New trailers $ 1,464,636 $ 198,043 $ — $ 1,662,679 71.7% Used trailers 435 2,044 — — 2,479 0.1% Components, parts and service 40,344 113,024 15,023 (27,902) 140,489 6.1% Equipment and other 16,126 71,405 426,887 (929) 513,489 22.1% Total net external sales $ 1,521,541 $ 384,516 $ 441,910 $ (28,831) $ 2,319,136 100.0% Year ended December 31, 2018 Commercial Trailer Products Diversified Products Final Mile Products Eliminations Consolidated New trailers $ 1,473,583 $ 164,790 $ — $ — $ 1,638,373 72.2% Used trailers 9,618 3,514 — — 13,132 0.6% Components, parts and service 34,994 122,099 9,968 (21,811) 145,250 6.4% Equipment and other 18,744 103,568 348,281 (70) 470,523 20.8% Total net external sales $ 1,536,939 $ 393,971 $ 358,249 $ (21,881) $ 2,267,278 100.0%

DIVESTITURES AND SALES

DIVESTITURES AND SALES	12 Months Ended
	Dec. 31, 2020
Discontinued Operations and Disposal Groups [Abstract]
DIVESTITURES AND SALES	DIVESTITURES AND SALES During the fourth quarter of 2020 the Company sold its Beall ® brand of tank trailers and associated assets for net proceeds of $11.2 million. Prior to the sale, Beall ® was an operating unit within the Tank Trailers reporting unit. A loss on sale of approximately $2.1 million was recognized in connection with the divestiture, and the net proceeds of $11.2 million from the sale were used to pay down outstanding principal under the New Term Loan Credit Agreement. The loss on sale is included in Impairment and other, net in the Consolidated Statements of Operations. In accordance with the relevant accounting guidance, as part of the sale the Company allocated $4.7 million of goodwill based upon the relative fair value of the Beall ® operating unit compared to the Tank Trailers reporting unit as a whole. This goodwill was included in the carrying value of the disposed assets and the resulting loss recognized in connection with the sale. In addition, during the fourth quarter of 2020 the Company sold the property, plant, and equipment assets, which were previously classified as held for sale, from the remaining retail location in Columbus, Ohio for net proceeds of $3.2 million. A gain on sale of approximately $2.3 million was recognized as part of the sale. The gain on sale is included in Impairment and other, net in the Consolidated Statements of Operations. During the second quarter of 2020, the Company sold property, plant, and equipment assets for proceeds totaling $2.7 million and recognized a gain on sale of approximately $1.7 million. The gain on sale is included in Impairment and other, net in the Consolidated Statements of Operations.

CONSOLIDATED QUARTERLY FINANCIA

CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED)	12 Months Ended
	Dec. 31, 2020
Quarterly Financial Data [Abstract]
CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED)	CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED) The following is a summary of the unaudited quarterly results of operations for fiscal years 2020, 2019, and 2018 (dollars in thousands, except per share amounts): First Second Third Fourth 2020 Net sales $ 387,074 $ 339,153 $ 351,584 $ 404,078 Gross profit $ 36,743 $ 34,321 $ 43,194 $ 45,496 Net (loss) income $ (106,647) $ (146) $ 3,887 $ 5,494 Basic net (loss) income per share (1) $ (2.01) $ — $ 0.07 $ 0.10 Diluted net (loss) income per share (1) $ (2.01) $ — $ 0.07 $ 0.10 2019 Net sales $ 533,174 $ 626,053 $ 580,908 $ 579,001 Gross profit $ 68,690 $ 87,650 $ 77,735 $ 72,307 Net income $ 14,780 $ 30,960 $ 25,460 $ 18,375 Basic net income per share (1) $ 0.27 $ 0.56 $ 0.47 $ 0.34 Diluted net income per share (1) $ 0.27 $ 0.56 $ 0.46 $ 0.34 2018 Net sales $ 491,319 $ 612,690 $ 553,073 $ 610,196 Gross profit $ 64,119 $ 85,315 $ 65,162 $ 69,056 Net income $ 21,272 $ 31,902 $ 4,664 $ 11,584 Basic net income per share (1) $ 0.37 $ 0.55 $ 0.08 $ 0.21 Diluted net income per share (1) $ 0.35 $ 0.54 $ 0.08 $ 0.21 ————————— (1) Basic and diluted net (loss) income per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly net (loss) income per share may differ from annual net (loss) income per share due to rounding.

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Oct. 01, 2020	Dec. 31, 2020
Accounting Policies [Abstract]
Basis of Consolidation		The consolidated financial statements reflect the accounts of the Company and its wholly-owned and majority-owned subsidiaries. All significant intercompany profits, transactions, and balances have been eliminated in consolidation.
Reclassifications		Certain prior period amounts have been reclassified to conform to the current year presentation.
Use of Estimates		The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that directly affect the amounts reported in its consolidated financial statements and accompanying notes. Actual results could differ from these estimates.
Cash and Cash Equivalents		Cash and cash equivalents include all highly liquid investments with a maturity of three months or less at the time of purchase.
Accounts Receivable		Accounts receivable are shown net of expected losses and primarily include trade receivables. The Company records expected losses for customers based upon a variety of factors including the Company’s historical collection experience, the length of time the account has been outstanding and the financial condition of the customer. If the circumstances related to specific customers were to change, the Company’s estimates of expected losses with respect to the collectability of the related accounts could be further adjusted. The Company’s policy is to write-off receivables when they are determined to be uncollectible. Expected losses are charged to Selling and General and administrative expenses
Inventories		Inventories are stated at the lower of cost, determined on either the first-in, first-out or average cost method, or net realizable value. The cost of manufactured inventory includes raw material, labor and overhead.
Prepaid Expenses and Other		Chassis converter pool agreements represent chassis transferred to the Company on a restricted basis by the manufacturer, who retains the sole authority to authorize commencement of work on the chassis and to make certain other decisions with respect to the chassis including the terms and pricing of sales to the manufacturer’s dealers. Assets held for sale are related to unused land parcels. Insurance premiums and maintenance agreements are charged to expense over the contractual life, which is generally one year or less. Other items primarily consist of the Company’s commodity swap contracts that are in an asset position, contract assets related to contracts for which the Company recognizes revenue on an over time basis, and investments held by the Company’s captive insurance subsidiary.
Property, Plant and Equipment		Property, plant and equipment are recorded at cost, net of accumulated depreciation. Maintenance and repairs are charged to expense as incurred, while expenditures that extend the useful life of an asset are capitalized. Depreciation is recorded using the straight-line method over the estimated useful lives of the depreciable assets. The estimated useful lives are up to 33 years for buildings and building improvements and range from three to ten years for machinery and equipment.
Goodwill	Goodwill represents the excess purchase price over fair value of the net assets acquired. The Company determines its reporting units at the individual operating segment level, or one level below, when there is discrete financial information available that is regularly reviewed by segment management for evaluating operating results. The Company reviews goodwill for impairment, at the reporting unit level, annually on October 1 and whenever events or changes in circumstances indicate its carrying value may not be recoverable. In accordance with ASC 350, Intangibles - Goodwill and Other , goodwill is reviewed for impairment utilizing either a qualitative assessment or a quantitative process. The Company has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. An entity has an unconditional option to bypass the qualitative assessment in any period and proceed directly to performing the quantitative impairment test, which is the option the Company has historically chosen. For reporting units in which the Company performs the quantitative analysis, the Company compares the carrying value, including goodwill, of each reporting unit with its estimated fair value. If the fair value of the reporting unit exceeds its carrying value, the goodwill is not considered impaired. If the carrying value is greater than the fair value, the difference is recognized as an impairment loss charged to the reporting unit. After an impairment loss is recognized, the adjusted carrying amount of goodwill shall be its new accounting basis. The Company exercised its unconditional option to bypass the qualitative assessment of goodwill for all of its reporting units and instead prepared a quantitative assessment to estimate the fair value of each reporting unit at the annual testing date of October 1, 2020 utilizing a combination of the income approach and the market approach, weighted equally. Based on the quantitative assessment performed, all of the Company’s reporting units exceeded their carrying values; as such, there was no goodwill impairment as a result of the 2020 annual goodwill impairment test.
Long-Lived Assets		Long-lived assets, consisting primarily of intangible assets and property, plant and equipment, are reviewed for impairment whenever facts and circumstances indicate that the carrying amount may not be recoverable. Specifically, this process involves comparing an asset’s carrying value to the estimated undiscounted future cash flows the asset is expected to generate over its remaining life. If this process were to result in the conclusion that the carrying value of a long-lived asset would not be recoverable, a write-down of the asset to fair value would be recorded through a charge to operations. Fair value is determined based upon discounted cash flows or appraisals as appropriate.
Other Assets		The Company capitalizes the cost of computer software developed or obtained for internal use. Capitalized software is amortized using the straight-line method over three
Warranties		The Company offers a limited warranty for its products with a coverage period that ranges between one ® trailer panels is ten years. The Company passes through component manufacturers’ warranties to our customers. The Company’s policy is to accrue the estimated cost of warranty coverage at the time of the sale.
Self Insured Liabilities		The Company is self-insured up to specified limits for medical and workers’ compensation coverage. The self-insurance reserves have been recorded to reflect the undiscounted estimated liabilities, including claims incurred but not reported, as well as catastrophic claims as appropriate.
Income Taxes		The Company determines its provision or benefit for income taxes under the asset and liability method. The asset and liability method measures the expected tax impact at current enacted rates of future taxable income or deductions resulting from differences in the tax and financial reporting basis of assets and liabilities reflected in the Consolidated Balance Sheets. Future tax benefits of tax losses and credit carryforwards are recognized as deferred tax assets. Deferred tax assets are reduced by a valuation allowance to the extent management determines that it is more-likely-than-not the Company would not realize the value of these assets.The Company accounts for income tax contingencies by prescribing a “more-likely-than-not” recognition threshold that a tax position is required to meet before being recognized in the financial statements.
Used Trailer Trade Commitments		The Company may accept trade-in of used trailers when a customer enters into a contract to purchase a new trailer. However, in the contracts for the sale of the new trailers, there is no commitment to repurchase that trailer or a similar trailer in the future. As of December 31, 2020, the Company had no outstanding trade commitments and $3.5 million outstanding trade commitments as of December 31, 2019. On occasion, the amount of the trade allowance provided for in the used trailer commitments, or cost, may exceed the net realizable value of the underlying used trailer. In these instances, the Company’s policy is to recognize the loss related to these commitments at the time the new trailer revenue is recognized. Net realizable value of used trailers is measured considering market sales data for comparable types of trailers.
Concentration of Credit Risk		Financial instruments that potentially subject us to significant concentrations of credit risk consist principally of cash, cash equivalents, and customer receivables. We place our cash and cash equivalents with high quality financial institutions. Generally, we do not require collateral or other security to support customer receivables.
Research and Development		Research and development expenses are charged to Cost of sales and General and administrative expenses
New Accounting Pronouncements		In June 2016, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standard Update (“ASU”) 2016-13, “Financial Instruments - Credit Losses,” which introduced new guidance for an approach based on expected losses to estimate credit losses on certain types of financial instruments. It also modifies the impairment model for available-for-sale debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. Instruments in scope include loans, held-to-maturity debt securities, and net investments in leases as well as reinsurance and trade receivables. In November 2018, the FASB issued ASU 2018-19, which clarifies that operating lease receivables are outside the scope of the new standard. The Company adopted the standard using the modified retrospective approach as required on January 1, 2020. The adoption of the new credit losses model did not have a material impact on the Company’s consolidated financial statements.
Revenue Recognition		The Company recognizes revenue from the sale of its products when obligations under the terms of a contract with our customers are satisfied; this occurs with the transfer of control of our products and replacement parts or throughout the completion of service work. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring promised goods or services to a customer and excludes all taxes collected from the customer. Shipping and handling fees are included in Net sales and the associated costs included in Cost of sales in the Consolidated Statements of Operations. For shipping and handling costs that take place after the transfer of control, the Company is applying the practical expedient and treating it as a fulfillment cost. Incidental items that are immaterial in the context of the contract are recognized as expense. For performance obligations satisfied over time, which include certain equipment-related sales within our Diversified Products reportable segment that have no alternative use and contain an enforceable right to payment, as well as service work whereby the customer simultaneously receives and consumes the benefits provided, the Company recognizes revenue on the basis of the Company’s efforts or inputs to the satisfaction of these performance obligations, measured by actual total cost incurred to the total estimated costs for each project. Total revenue recognized over time was not material to the consolidated financial statements for all periods presented. The Company has identified three separate and distinct performance obligations: (1) the sale of a trailer or equipment, (2) the sale of replacement parts, and (3) service work. For trailer, truck body, equipment, and replacement part sales, control is transferred and revenue is recognized from the sale upon shipment to or pick up by the customer in accordance with the contract terms. The Company does not have any material extended payment terms as payment is received shortly after the point of sale. Accounts receivable are recorded when the right to consideration becomes unconditional. The Company does have customers who pay for the product prior to the transfer of control which is recorded as customer deposits in Other accrued liabilities as shown in Note 8. Customer deposits are recognized as revenue when the Company performs its obligations under the contract and transfers control of the product.

SUMMARY OF SIGNIFICANT ACCOUN_3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Changes in the Allowance for Doubtful Accounts	The following table presents the changes in expected losses (in thousands): Years ended December 31, 2020 2019 2018 Balance at beginning of year $ 670 $ 665 $ 869 Expected losses 362 282 63 Write-offs, net of recoveries (496) (277) (267) Balance at end of year $ 536 $ 670 $ 665
Prepaid Expenses and Other Current Assets	Prepaid expenses and other as of December 31, 2020 and 2019 consists of the following (in thousands): December 31, 2020 2019 Chassis converter pool agreements $ 17,767 $ 10,164 Income tax receivables 18,073 8,701 Insurance premiums & maintenance agreements 4,384 3,217 Assets held for sale 1,897 3,020 All other 20,915 16,120 $ 63,036 $ 41,222
Schedule of Product Warranty Liability	The following table presents the changes in the product warranty accrual included in Other accrued liabilities (in thousands): 2020 2019 Balance as of January 1 $ 22,575 $ 22,247 Provision for warranties issued in current year 4,334 8,027 Net adjustment to warranty accrual (228) (2,320) Payments (6,111) (5,379) Balance as of December 31 $ 20,570 $ 22,575
Changes in the Self-Insurance Accrual Included in Other Accrued Liabilities	The following table presents the changes in the self-insurance accrual included in Other accrued liabilities (in thousands): 2020 2019 Balance as of January 1 $ 12,934 $ 9,890 Expense 47,612 57,733 Payments (48,460) (54,689) Balance as of December 31 $ 12,086 $ 12,934

GOODWILL AND OTHER INTANGIBLE_2

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	For the years ended December 31, 2020, 2019, and 2018, the changes in the carrying amounts of goodwill were as follows (in thousands): Commercial Trailer Products Diversified Products Final Mile Products Total Balance at December 31, 2018 Goodwill $ 4,288 $ 145,688 $ 167,715 $ 317,691 Accumulated impairment losses (1,663) (4,944) — (6,607) Net balance at December 31, 2018 2,625 140,744 167,715 311,084 Impact of divestiture on goodwill — (4,944) — (4,944) Impact of divestiture on accumulated impairment losses — 4,944 — 4,944 Effects of foreign currency — (58) — (58) Balance at December 31, 2019 Goodwill 4,288 140,686 167,715 312,689 Accumulated impairment losses (1,663) — — (1,663) Net balance as of December 31, 2019 2,625 140,686 167,715 311,026 Goodwill impairments — (10,971) (95,766) (106,737) Impact of divestiture on goodwill — (4,685) — (4,685) Effects of foreign currency — (44) — (44) Balance as of December 31, 2020 Goodwill 4,288 135,957 167,715 307,960 Accumulated impairment losses (1,663) (10,971) (95,766) (108,400) Net balance as of December 31, 2020 $ 2,625 $ 124,986 $ 71,949 $ 199,560
Schedule of Finite-Lived Intangible Assets	As of December 31, 2020, the balances of intangible assets, other than goodwill, were as follows (in thousands): Weighted Average Gross Intangible Accumulated Net Intangible Tradenames and trademarks 20 years $ 51,481 $ (19,975) $ 31,506 Customer relationships 13 years 276,973 (145,356) 131,617 Technology 12 years 12,828 (9,064) 3,764 Total $ 341,282 $ (174,395) $ 166,887 As of December 31, 2019, the balances of intangible assets, other than goodwill, were as follows (in thousands): Weighted Average Gross Intangible Accumulated Net Intangible Tradenames and trademarks 20 years $ 53,103 $ (17,962) $ 35,141 Customer relationships 13 years 282,863 (132,903) 149,960 Technology 12 years 14,045 (9,248) 4,797 Total $ 350,011 $ (160,113) $ 189,898

INVENTORIES (Tables)

INVENTORIES (Tables)	12 Months Ended
	Dec. 31, 2020
Inventory Disclosure [Abstract]
Schedule of Inventory, Current	Inventories, net of reserves, consist of the following (in thousands): December 31, 2020 2019 Raw materials and components $ 99,418 $ 105,332 Finished goods 44,695 58,224 Work in progress 11,592 14,269 Used trailers 1,478 2,499 Aftermarket parts 6,567 6,590 $ 163,750 $ 186,914

PROPERTY, PLANT AND EQUIPMENT (

PROPERTY, PLANT AND EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, plant and equipment, net consist of the following (in thousands): December 31, 2020 2019 Land $ 38,886 $ 36,794 Buildings and building improvements 149,364 146,210 Machinery and equipment 309,063 287,332 Construction in progress 9,349 36,179 506,662 506,515 Less: accumulated depreciation (296,986) (285,169) $ 209,676 $ 221,346

OTHER ACCRUED LIABILITIES (Tabl

OTHER ACCRUED LIABILITIES (Tables)	12 Months Ended
	Dec. 31, 2020
Payables and Accruals [Abstract]
Schedule of Accrued Liabilities	The following table presents the major components of Other accrued liabilities (in thousands): December 31, 2020 2019 Customer deposits $ 37,792 $ 19,324 Chassis converter pool agreements 17,767 10,164 Warranty 20,570 22,575 Payroll and related taxes 16,163 25,263 Self-insurance 12,086 12,934 Accrued interest 4,368 4,696 Operating lease obligations 4,117 4,369 Accrued taxes 4,790 10,344 All other 13,327 14,561 $ 130,980 $ 124,230

LONG-TERM DEBT (Tables)

LONG-TERM DEBT (Tables)	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Long-Term Debt	Long-term debt consists of the following (in thousands): December 31, 2020 December 31, 2019 Senior Notes due 2025 $ 315,000 $ 325,000 New Term Loan Credit Agreement 138,835 135,228 453,835 460,228 Less: unamortized discount and fees (5,856) (4,842) Less: current portion — — $ 447,979 $ 455,386
Contractual Coupon Interest Expense and Accretion Of Discount On Liability	Contractual coupon interest expense and accretion of discount and fees on the liability component for the Convertible Notes for the years ended December 31, 2020, 2019, and 2018 included in Interest expense on the Company’s Consolidated Statements of Operations were as follows (in thousands): Year Ended December 31, 2020 2019 2018 Contractual coupon interest expense $ — $ — $ 470 Accretion of discount and fees on the liability component $ — $ — $ 461

FINANCIAL DERIVATIVE INSTRUME_2

FINANCIAL DERIVATIVE INSTRUMENTS (Tables)	12 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	As of December 31, 2020 and 2019, the fair value carrying amount of the Company’s derivative instruments were recorded as follows (in thousands): Asset / (Liability) Derivatives Balance Sheet Caption December 31, 2020 December 31, 2019 Derivatives designated as hedging instruments Commodity swap contracts Prepaid expenses and other $ 13,750 $ 1,290 Commodity swap contracts Accounts payable and Other accrued liabilities (366) (3,216) Total derivatives designated as hedging instruments $ 13,384 $ (1,926)
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	The following table summarizes the gain or loss recognized in AOCI as of December 31, 2020 and 2019 and the amounts reclassified from AOCI into earnings for the years ended December 31, 2020, 2019, and 2018 (in thousands): Amount of Gain (Loss) Recognized in Location of Gain (Loss) Reclassified from AOCI into Earnings Amount of Gain (Loss) Reclassified from AOCI into Earnings Year Ended December 31, December 31, 2020 December 31, 2019 2020 2019 2018 Derivatives instruments Commodity swap contracts $ 9,815 $ (2,112) Cost of sales $ (7,778) $ (2,297) $ 142

LEASES (Tables)

LEASES (Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Assets and Liabilities, Lessee	Leased assets and liabilities included within the Consolidated Balance Sheets consist of the following (in thousands): Classification December 31, 2020 December 31, 2019 Right-of-Use Assets Operating Other assets $ 10,842 $ 14,246 Finance Property, plant and equipment, net 2,802 2,945 Total leased ROU assets $ 13,644 $ 17,191 Liabilities Current Operating Other accrued liabilities $ 4,117 $ 4,369 Finance Current portion of finance lease obligations 348 327 Noncurrent Operating Non-current liabilities 6,967 10,041 Finance Finance lease obligations 30 378 Total lease liabilities $ 11,462 $ 15,115
Lease, Cost	Lease costs included in the Consolidated Statements of Operations consist of the following (in thousands): Classification Twelve Months Ended December 31, 2020 Twelve Months Ended December 31, 2019 Operating lease cost Cost of sales, selling expenses and general and administrative expense $ 5,116 $ 5,172 Finance lease cost Amortization of ROU leased assets Depreciation and amortization within Cost of sales 144 144 Interest on lease liabilities Interest expense 53 65 Net lease cost $ 5,313 $ 5,381 December 31, 2020 December 31, 2019 Weighted average remaining lease term (years) Operating leases 3.6 4.0 Finance leases 1.1 2.1 Weighted average discount rate Operating leases 5.07 % 5.17 % Finance leases 6.16 % 6.16 % Lease costs included in the Consolidated Statements of Cash Flows are as follows (in thousands): Twelve Months Ended December 31, 2020 Twelve Months Ended December 31, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 5,091 $ 5,016 Operating cash flows from finance leases $ 34 $ 53 Financing cash flows from finance leases $ 327 $ 308
Operating Lease, Liability, Maturity	Maturity of the Company’s lease liabilities for leases that have commenced is as follows (in thousands): Operating Leases Finance Leases Total 2021 $ 4,569 $ 361 $ 4,930 2022 3,040 30 3,070 2023 2,185 — 2,185 2024 1,085 — 1,085 2025 537 — 537 Thereafter 721 — 721 Total lease payments $ 12,137 $ 391 $ 12,528 Less: interest 1,053 13 Present value of lease payments $ 11,084 $ 378
Finance Lease, Liability, Maturity	Maturity of the Company’s lease liabilities for leases that have commenced is as follows (in thousands): Operating Leases Finance Leases Total 2021 $ 4,569 $ 361 $ 4,930 2022 3,040 30 3,070 2023 2,185 — 2,185 2024 1,085 — 1,085 2025 537 — 537 Thereafter 721 — 721 Total lease payments $ 12,137 $ 391 $ 12,528 Less: interest 1,053 13 Present value of lease payments $ 11,084 $ 378

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value, Assets and Liabilities Measured on Recurring Basis	Fair value measurements and the fair value hierarchy level for the Company’s assets and liabilities measured at fair value on a recurring basis as of December 31, 2020 are shown below (in thousands): Frequency Asset / (Liability) Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs December 31, 2020 Commodity swap contracts Recurring $ 13,384 $ — $ 13,384 $ — Mutual funds Recurring $ 5,331 $ 5,331 $ — $ — Life-insurance contracts Recurring $ 16,930 $ — $ 16,930 $ — December 31, 2019 Commodity swap contracts Recurring $ (1,926) $ — $ (1,926) $ — Mutual funds Recurring $ 7,367 $ 7,367 $ — $ — Life-insurance contracts Recurring $ 15,072 $ — $ 15,072 $ —
Fair Value, Liabilities Measured on Recurring Basis	The Company’s carrying and estimated fair value of debt at December 31, 2020 and December 31, 2019 were as follows (in thousands): December 31, 2020 December 31, 2019 Fair Value Fair Value Carrying Level 1 Level 2 Level 3 Carrying Level 1 Level 2 Level 3 Instrument Senior Notes due 2025 $ 311,357 $ — $ 319,140 $ — $ 320,572 $ — $ 320,572 $ — New (2020) & Old (2019) Term Loan Credit Agreements 136,622 — 136,280 — 134,814 — 134,814 — $ 447,979 $ — $ 455,420 $ — $ 455,386 $ — $ 455,386 $ —

PER SHARE OF COMMON STOCK (Tabl

PER SHARE OF COMMON STOCK (Tables)	12 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	Year Ended December 31, 2020 2019 2018 Basic net (loss) income per share: Net (loss) income applicable to common stockholders $ (97,412) $ 89,575 $ 69,421 Weighted average common shares outstanding 52,945 54,695 56,996 Basic net (loss) income per share $ (1.84) $ 1.64 $ 1.22 Diluted net (loss) income per share: Net (loss) income applicable to common stockholders $ (97,412) $ 89,575 $ 69,421 Weighted average common shares outstanding 52,945 54,695 56,996 Dilutive shares from assumed conversion of convertible senior notes — — 455 Dilutive stock options and restricted stock — 595 979 Diluted weighted average common shares outstanding 52,945 55,290 58,430 Diluted net (loss) income per share $ (1.84) $ 1.62 $ 1.19

STOCK-BASED COMPENSATION (Table

STOCK-BASED COMPENSATION (Tables)	12 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	A summary of all restricted stock activity during 2020 is as follows: Number of Weighted Restricted Stock Outstanding at December 31, 2019 1,691,699 $ 20.24 Granted 1,010,802 12.43 Vested (314,048) 19.60 Forfeited (556,074) 20.56 Restricted Stock Outstanding at December 31, 2020 1,832,379 $ 16.06
Schedule of Share-based Compensation, Stock Options, Activity	A summary of all stock option activity during 2020 is as follows: Number of Options Weighted Average Exercise Price Weighted Average Remaining Contractual Life Aggregate Options Outstanding at December 31, 2019 531,942 $ 11.54 3.1 $ 1.7 Exercised (113,312) $ 11.24 $ 0.5 Forfeited — $ — Expired (4,550) $ 13.74 Options Outstanding at December 31, 2020 414,080 $ 11.60 2.2 $ 2.3 Options Exercisable at December 31, 2020 368,333 $ 11.67 2.3 $ 2.0

STOCKHOLDERS' EQUITY (Tables)

STOCKHOLDERS' EQUITY (Tables)	12 Months Ended
	Dec. 31, 2020
Stockholders' Equity Note [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	Changes in AOCI by component, net of tax, for the years ended December 31, 2020, 2019, and 2018 are summarized as follows (in thousands): Foreign Currency Translation Derivative Instruments Total Balances at December 31, 2017 $ (2,385) $ — $ (2,385) Net unrealized gains (losses) arising during the period (a) (193) (660) (853) Less: Net realized gains (losses) reclassified to net income (b) — 105 105 Net change during the period (193) (765) (958) Balances at December 31, 2018 (2,578) (765) (3,343) Net unrealized gains (losses) arising during the period (c) 712 (3,059) (2,347) Less: Net realized gains (losses) reclassified to net income (d) — (1,712) (1,712) Net change during the period 712 (1,347) (635) Balances at December 31, 2019 (1,866) (2,112) (3,978) Net unrealized gains (losses) arising during the period (e) (316) 6,111 5,795 Less: Net realized gains (losses) reclassified to net loss (f) — (5,816) (5,816) Net change during the period (316) 11,927 11,611 Balances at December 31, 2020 $ (2,182) $ 9,815 $ 7,633 ————————— (a) Derivative instruments net of $230 thousand of tax benefit for the year ended December 31, 2018. (b) Derivative instruments net of $37 thousand of tax expense for the year ended December 31, 2018. (c) Derivative instruments net of $1,031 thousand of tax benefit for the year ended December 31, 2019. (d) Derivative instruments net of $585 thousand of tax benefit for the year ended December 31, 2019. (e) Derivative instruments net of $2,058 thousand of tax expense for the year ended December 31, 2020. (f) Derivative instruments net of $1,962 thousand of tax benefit for the year ended December 31, 2020.

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Schedule of Income before Income Tax, Domestic and Foreign	The consolidated (loss) income before income taxes for 2020, 2019, and 2018 consists of the following (in thousands): Years Ended December 31, 2020 2019 2018 Domestic $ (110,049) $ 116,886 $ 94,978 Foreign 835 845 1,026 Total (loss) income before income taxes $ (109,214) $ 117,731 $ 96,004
Schedule of Components of Income Tax Expense (Benefit)	The consolidated income tax (benefit) expense for 2020, 2019, and 2018 consists of the following components (in thousands): Years Ended December 31, 2020 2019 2018 Current Federal $ (15,190) $ 18,167 $ 22,120 State (2,072) 6,233 7,271 Foreign 444 336 168 (16,818) 24,736 29,559 Deferred Federal 7,918 2,760 (1,613) State (2,959) 620 (1,312) Foreign 57 40 (51) 5,016 3,420 (2,976) Total consolidated (benefit) expense $ (11,802) $ 28,156 $ 26,583
Schedule of Effective Income Tax Rate Reconciliation	The following table provides a reconciliation of differences from the U.S. Federal statutory rates as follows (in thousands): Years Ended December 31, 2020 2019 2018 Pretax book (loss) income $ (109,214) $ 117,731 $ 96,004 Federal tax (benefit) expense at applicable statutory rate (22,935) 24,723 20,161 State and local income taxes (net of federal benefit) (4,948) 5,513 4,737 Rate differential (5,004) — — Goodwill impairment 20,111 — — Tax credits — (3,301) — Remeasurement of deferred taxes — — (421) Nondeductible officer compensation 490 — 1,152 Compensation expense 1,070 1,317 (1,009) Other (586) (96) 1,963 Total income tax (benefit) expense $ (11,802) $ 28,156 $ 26,583
Schedule of Deferred Tax Assets and Liabilities	The components of deferred tax assets and deferred tax liabilities as of December 31, 2020 and 2019 were as follows (in thousands): December 31, 2020 2019 Deferred tax assets Tax credits and loss carryforwards $ 2,518 $ 672 Accrued liabilities 6,415 7,489 Incentive compensation 9,202 14,420 Other 328 5,423 18,463 28,004 Deferred tax liabilities Property, plant and equipment (22,355) (17,899) Intangibles (40,043) (44,477) Other (1,822) (2,379) (64,220) (64,755) Net deferred tax liability before valuation allowances and reserves (45,757) (36,751) Valuation allowances (1,020) (825) Net deferred tax liability $ (46,777) $ (37,576)
Schedule of Unrecognized Tax Benefits Roll Forward	A reconciliation of the beginning and ending amount of unrecognized tax benefits, excluding interest and penalties, was as follows (in thousands) and all balances as of December 31, 2020 were included in either Other noncurrent liabilities or Deferred income taxes in the Company’s Consolidated Balance Sheets: Unrecognized Tax Benefits Balance at January 1, 2019 $ 1,177 Increase in prior year tax positions 245 Balance at December 31, 2019 1,422 Increase in prior year tax positions 84 Balance at December 31, 2020 $ 1,506

SEGMENTS (Tables)

SEGMENTS (Tables)	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Reportable Segment Information	Reportable segment information is as follows (in thousands): Commercial Diversified Final Mile Corporate and Consolidated 2020 Net sales External customers $ 992,528 $ 270,963 $ 218,398 $ — $ 1,481,889 Intersegment sales 248 23,171 — (23,419) — Total net sales $ 992,776 $ 294,134 $ 218,398 $ (23,419) $ 1,481,889 Depreciation and amortization $ 11,557 $ 19,300 $ 14,891 $ 2,222 $ 47,970 Income (Loss) from operations $ 79,662 $ 1,563 $ (123,585) $ (43,248) $ (85,608) Assets $ 306,587 $ 278,643 $ 375,115 $ 201,125 $ 1,161,470 2019 Net sales External customers $ 1,519,592 $ 357,634 $ 441,910 $ — $ 2,319,136 Intersegment sales 1,949 26,882 — (28,831) — Total net sales $ 1,521,541 $ 384,516 $ 441,910 $ (28,831) $ 2,319,136 Depreciation and amortization $ 10,667 $ 18,621 $ 11,361 $ 1,708 $ 42,357 Income (Loss) from operations $ 145,877 $ 29,748 $ 9,804 $ (42,643) $ 142,786 Assets $ 362,328 $ 317,246 $ 511,862 $ 113,155 $ 1,304,591 2018 Net sales External customers $ 1,536,687 $ 372,342 $ 358,249 $ — $ 2,267,278 Intersegment sales 252 21,629 — (21,881) — Total net sales $ 1,536,939 $ 393,971 $ 358,249 $ (21,881) $ 2,267,278 Depreciation and amortization $ 9,631 $ 21,177 $ 8,314 $ 1,561 $ 40,683 Income (Loss) from operations $ 141,795 $ (3,033) $ 7,907 $ (35,682) $ 110,987 Assets $ 355,183 $ 349,423 $ 484,634 $ 115,153 $ 1,304,393
Major Product Categories and Percentage of Consolidated Net Sales	The following table sets forth the major product categories and their percentage of consolidated net sales (dollars in thousands): Year ended December 31, 2020 Commercial Trailer Products Diversified Products Final Mile Products Eliminations Consolidated New trailers $ 941,932 $ 145,888 $ — $ — $ 1,087,820 73.4% Used trailers 3,841 4,545 — — 8,386 0.6% Components, parts and service 36,912 88,010 12,517 (23,391) 114,048 7.7% Equipment and other 10,091 55,691 205,881 (28) 271,635 18.3% Total net external sales $ 992,776 $ 294,134 $ 218,398 $ (23,419) $ 1,481,889 100.0% Year ended December 31, 2019 Commercial Trailer Products Diversified Products Final Mile Products Eliminations Consolidated New trailers $ 1,464,636 $ 198,043 $ — $ 1,662,679 71.7% Used trailers 435 2,044 — — 2,479 0.1% Components, parts and service 40,344 113,024 15,023 (27,902) 140,489 6.1% Equipment and other 16,126 71,405 426,887 (929) 513,489 22.1% Total net external sales $ 1,521,541 $ 384,516 $ 441,910 $ (28,831) $ 2,319,136 100.0% Year ended December 31, 2018 Commercial Trailer Products Diversified Products Final Mile Products Eliminations Consolidated New trailers $ 1,473,583 $ 164,790 $ — $ — $ 1,638,373 72.2% Used trailers 9,618 3,514 — — 13,132 0.6% Components, parts and service 34,994 122,099 9,968 (21,811) 145,250 6.4% Equipment and other 18,744 103,568 348,281 (70) 470,523 20.8% Total net external sales $ 1,536,939 $ 393,971 $ 358,249 $ (21,881) $ 2,267,278 100.0%

CONSOLIDATED QUARTERLY FINANC_2

CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)	12 Months Ended
	Dec. 31, 2020
Quarterly Financial Data [Abstract]
Schedule of Quarterly Financial Information	The following is a summary of the unaudited quarterly results of operations for fiscal years 2020, 2019, and 2018 (dollars in thousands, except per share amounts): First Second Third Fourth 2020 Net sales $ 387,074 $ 339,153 $ 351,584 $ 404,078 Gross profit $ 36,743 $ 34,321 $ 43,194 $ 45,496 Net (loss) income $ (106,647) $ (146) $ 3,887 $ 5,494 Basic net (loss) income per share (1) $ (2.01) $ — $ 0.07 $ 0.10 Diluted net (loss) income per share (1) $ (2.01) $ — $ 0.07 $ 0.10 2019 Net sales $ 533,174 $ 626,053 $ 580,908 $ 579,001 Gross profit $ 68,690 $ 87,650 $ 77,735 $ 72,307 Net income $ 14,780 $ 30,960 $ 25,460 $ 18,375 Basic net income per share (1) $ 0.27 $ 0.56 $ 0.47 $ 0.34 Diluted net income per share (1) $ 0.27 $ 0.56 $ 0.46 $ 0.34 2018 Net sales $ 491,319 $ 612,690 $ 553,073 $ 610,196 Gross profit $ 64,119 $ 85,315 $ 65,162 $ 69,056 Net income $ 21,272 $ 31,902 $ 4,664 $ 11,584 Basic net income per share (1) $ 0.37 $ 0.55 $ 0.08 $ 0.21 Diluted net income per share (1) $ 0.35 $ 0.54 $ 0.08 $ 0.21 ————————— (1) Basic and diluted net (loss) income per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly net (loss) income per share may differ from annual net (loss) income per share due to rounding.

SUMMARY OF SIGNIFICANT ACCOUN_4

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Changes in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	$ 670	$ 665	$ 869
Expected losses	362	282	63
Write-offs, net of recoveries	(496)	(277)	(267)
Balance at end of year	$ 536	$ 670	$ 665

SUMMARY OF SIGNIFICANT ACCOUN_5

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Prepaid Expenses and Other (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Chassis converter pool agreements	$ 17,767	$ 10,164
Income tax receivables	18,073	8,701
Insurance premiums & maintenance agreements	4,384	3,217
Assets held for sale	1,897	3,020
All other	20,915	16,120
Prepaid expenses and other	$ 63,036	$ 41,222

SUMMARY OF SIGNIFICANT ACCOUN_6

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)	Oct. 01, 2020	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Restricted cash		$ 0				$ 0	$ 0
Goodwill, impairment loss	$ 0				$ 4,900,000	106,737,000
Goodwill		199,560,000		$ 311,084,000		199,560,000	311,026,000	$ 311,084,000
Impact of divestiture on goodwill						4,685,000	4,944,000
Asset impairment				13,000,000	7,100,000	107,114,000	0	24,968,000
Capitalized computer software, net		6,100,000				6,100,000	7,200,000
Capitalized computer software, amortization						2,000,000	1,700,000	1,500,000
Research and development expense						21,900,000	19,500,000	8,800,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Beall Tank Trailers
Property, Plant and Equipment [Line Items]
Impact of divestiture on goodwill		4,700,000
Impairment of intangible assets		1,100,000
Commercial Trailer Products
Property, Plant and Equipment [Line Items]
Goodwill, impairment loss						0
Goodwill		2,625,000		2,625,000		2,625,000	2,625,000	2,625,000
Impact of divestiture on goodwill						0	0
Diversified Products
Property, Plant and Equipment [Line Items]
Goodwill, impairment loss					$ 4,900,000	10,971,000
Goodwill		124,986,000		140,744,000		124,986,000	140,686,000	140,744,000
Impact of divestiture on goodwill						4,685,000	4,944,000
Final Mile Products
Property, Plant and Equipment [Line Items]
Goodwill, impairment loss			$ 95,800,000			95,766,000
Goodwill		71,949,000		$ 167,715,000		71,949,000	167,715,000	$ 167,715,000
Impact of divestiture on goodwill						$ 0	0
Process Systems Reporting Unit | Diversified Products
Property, Plant and Equipment [Line Items]
Goodwill							42,300,000
Tank Trailers Reporting Unit
Property, Plant and Equipment [Line Items]
Goodwill, impairment loss			$ 11,000,000
Tank Trailers Reporting Unit | Diversified Products
Property, Plant and Equipment [Line Items]
Goodwill							98,400,000
Buildings and building improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful lives						33 years
Used trailers
Property, Plant and Equipment [Line Items]
Accounts payable, trade		$ 0				$ 0	$ 3,500,000
Minimum
Property, Plant and Equipment [Line Items]
Capitalized computer software, amortization period						3 years
Standard product warranty, coverage period						1 year
Minimum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful lives						three
Maximum
Property, Plant and Equipment [Line Items]
Capitalized computer software, amortization period						7 years
Standard product warranty, coverage period						5 years
Maximum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful lives						ten years
DuraPlate Trailer Panels
Property, Plant and Equipment [Line Items]
Standard product warranty, coverage period						10 years

SUMMARY OF SIGNIFICANT ACCOUN_7

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Product Warranty Accrual Included in Other Accrued Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Balance as of January 1	$ 22,575	$ 22,247
Provision for warranties issued in current year	4,334	8,027
Net adjustment to warranty accrual	(228)	(2,320)
Payments	(6,111)	(5,379)
Balance as of December 31	$ 20,570	$ 22,575

SUMMARY OF SIGNIFICANT ACCOUN_8

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Self-Insurance Accrual Included In Other Accrued Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Self Insurance Reserve [Roll Forward]
Balance as of January 1	$ 12,934	$ 9,890
Expense	47,612	57,733
Payments	(48,460)	(54,689)
Balance as of December 31	$ 12,086	$ 12,934

GOODWILL AND OTHER INTANGIBLE_3

GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($)	Oct. 01, 2020	Dec. 31, 2020	Mar. 31, 2020	Sep. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill		$ 199,560,000			$ 199,560,000	$ 311,026,000	$ 311,084,000
Goodwill, gross		307,960,000			307,960,000	312,689,000	317,691,000
Goodwill, impairment loss	$ 0			$ 4,900,000	106,737,000
Amortization of intangibles					21,981,000	20,471,000	19,468,000
2021		23,000,000			23,000,000
2022		17,900,000			17,900,000
2023		15,300,000			15,300,000
2024		15,100,000			15,100,000
2025		14,000,000			14,000,000
Beall Tank Trailers | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Goodwill [Line Items]
Impairment of intangible assets		1,100,000
Tank Trailers Reporting Unit
Goodwill [Line Items]
Goodwill, impairment loss			$ 11,000,000
Commercial Trailer Products
Goodwill [Line Items]
Goodwill		2,625,000			2,625,000	2,625,000	2,625,000
Goodwill, gross		4,288,000			4,288,000	4,288,000	4,288,000
Goodwill, impairment loss					0
Diversified Products
Goodwill [Line Items]
Goodwill		124,986,000			124,986,000	140,686,000	140,744,000
Goodwill, gross		135,957,000			135,957,000	140,686,000	145,688,000
Goodwill, impairment loss				$ 4,900,000	10,971,000
Diversified Products | Tank Trailers Reporting Unit
Goodwill [Line Items]
Goodwill						98,400,000
Diversified Products | Process Systems Reporting Unit
Goodwill [Line Items]
Goodwill						42,300,000
Final Mile Products
Goodwill [Line Items]
Goodwill		71,949,000			71,949,000	167,715,000	167,715,000
Goodwill, gross		$ 167,715,000			167,715,000	$ 167,715,000	$ 167,715,000
Goodwill, impairment loss			$ 95,800,000		$ 95,766,000

GOODWILL AND OTHER INTANGIBLE_4

GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in the Carrying Amounts of Goodwill (Details) - USD ($)	Oct. 01, 2020	Mar. 31, 2020	Sep. 30, 2018	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Goodwill, gross at beginning of period		$ 312,689,000		$ 312,689,000	$ 317,691,000
Accumulated impairment losses at beginning of period		(1,663,000)		(1,663,000)	(6,607,000)
Goodwill at beginning of period		311,026,000		311,026,000	311,084,000
Impact of divestiture on goodwill				4,685,000	4,944,000
Impact of divestiture on accumulated impairment losses					4,944,000
Goodwill impairments	$ 0		$ 4,900,000	106,737,000
Effects of foreign currency				(44,000)	(58,000)
Goodwill, gross at end of period				307,960,000	312,689,000
Accumulated impairment losses at end of period				(108,400,000)	(1,663,000)
Goodwill at end of period				199,560,000	311,026,000
Commercial Trailer Products
Goodwill [Roll Forward]
Goodwill, gross at beginning of period		4,288,000		4,288,000	4,288,000
Accumulated impairment losses at beginning of period		(1,663,000)		(1,663,000)	(1,663,000)
Goodwill at beginning of period		2,625,000		2,625,000	2,625,000
Impact of divestiture on goodwill				0	0
Impact of divestiture on accumulated impairment losses					0
Goodwill impairments				0
Effects of foreign currency				0	0
Goodwill, gross at end of period				4,288,000	4,288,000
Accumulated impairment losses at end of period				(1,663,000)	(1,663,000)
Goodwill at end of period				2,625,000	2,625,000
Diversified Products
Goodwill [Roll Forward]
Goodwill, gross at beginning of period		140,686,000		140,686,000	145,688,000
Accumulated impairment losses at beginning of period		0		0	(4,944,000)
Goodwill at beginning of period		140,686,000		140,686,000	140,744,000
Impact of divestiture on goodwill				4,685,000	4,944,000
Impact of divestiture on accumulated impairment losses					4,944,000
Goodwill impairments			$ 4,900,000	10,971,000
Effects of foreign currency				(44,000)	(58,000)
Goodwill, gross at end of period				135,957,000	140,686,000
Accumulated impairment losses at end of period				(10,971,000)	0
Goodwill at end of period				124,986,000	140,686,000
Final Mile Products
Goodwill [Roll Forward]
Goodwill, gross at beginning of period		167,715,000		167,715,000	167,715,000
Accumulated impairment losses at beginning of period		0		0	0
Goodwill at beginning of period		167,715,000		167,715,000	167,715,000
Impact of divestiture on goodwill				0	0
Impact of divestiture on accumulated impairment losses					0
Goodwill impairments		$ 95,800,000		95,766,000
Effects of foreign currency				0	0
Goodwill, gross at end of period				167,715,000	167,715,000
Accumulated impairment losses at end of period				(95,766,000)	0
Goodwill at end of period				$ 71,949,000	$ 167,715,000

GOODWILL AND OTHER INTANGIBLE_5

GOODWILL AND OTHER INTANGIBLE ASSETS - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	$ 341,282	$ 350,011
Accumulated Amortization	(174,395)	(160,113)
Net Intangible Assets	$ 166,887	$ 189,898
Tradenames and trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	20 years	20 years
Gross Intangible Assets	$ 51,481	$ 53,103
Accumulated Amortization	(19,975)	(17,962)
Net Intangible Assets	$ 31,506	$ 35,141
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	13 years	13 years
Gross Intangible Assets	$ 276,973	$ 282,863
Accumulated Amortization	(145,356)	(132,903)
Net Intangible Assets	$ 131,617	$ 149,960
Technology
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	12 years	12 years
Gross Intangible Assets	$ 12,828	$ 14,045
Accumulated Amortization	(9,064)	(9,248)
Net Intangible Assets	$ 3,764	$ 4,797

INVENTORIES - Schedule of Inven

INVENTORIES - Schedule of Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Raw materials and components	$ 99,418	$ 105,332
Finished goods	44,695	58,224
Work in progress	11,592	14,269
Used trailers	1,478	2,499
Aftermarket parts	6,567	6,590
Inventories	$ 163,750	$ 186,914

PROPERTY, PLANT AND EQUIPMENT -

PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 24,000	$ 20,200	$ 19,700
Finance lease, right-of-use asset, net of accumulated amortization	2,802	2,945
Finance lease, right-of-use asset, accumulated amortization	$ 1,800	$ 1,700

PROPERTY, PLANT AND EQUIPMENT_2

PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 506,662	$ 506,515
Less: accumulated depreciation	(296,986)	(285,169)
Property, plant, and equipment, net	209,676	221,346
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	38,886	36,794
Buildings and building improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	149,364	146,210
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	309,063	287,332
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 9,349	$ 36,179

OTHER ACCRUED LIABILITIES - Maj

OTHER ACCRUED LIABILITIES - Major Components of Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Customer deposits	$ 37,792	$ 19,324
Chassis converter pool agreements	17,767	10,164
Warranty	20,570	22,575	$ 22,247
Payroll and related taxes	16,163	25,263
Self-insurance	12,086	12,934	$ 9,890
Accrued interest	4,368	4,696
Operating lease obligations	4,117	4,369
Accrued taxes	4,790	10,344
All other	13,327	14,561
Other accrued liabilities	$ 130,980	$ 124,230

LONG-TERM DEBT - Components of

LONG-TERM DEBT - Components of Long Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt	$ 453,835	$ 460,228
Less: unamortized discount and fees	(5,856)	(4,842)
Less: current portion	0	0
Long-term debt	447,979	455,386
Senior Notes due 2025
Debt Instrument [Line Items]
Long-term debt	315,000	325,000
New Term Loan Credit Agreement
Debt Instrument [Line Items]
Long-term debt	$ 138,835	$ 135,228

LONG-TERM DEBT - Senior Notes N

LONG-TERM DEBT - Senior Notes Narrative (Details) - USD ($)	Sep. 26, 2017	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Interest expense			$ 24,194,000	$ 27,340,000	$ 28,759,000
Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 325,000,000
Notes issued, interest rate	5.50%
Proceeds from issuance of senior long-term debt	$ 318,900,000
Debt instrument, redemption price, percentage			101.00%
Debt instrument, redemption price, percentage of principal amount outstanding			60.00%
Interest expense			$ 18,600,000	$ 18,500,000	$ 18,500,000
Repayments of long-term debt		$ 10,000,000
Senior Notes | Prior to October 1, 2020
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			100.00%
Debt instrument, redemption price, percentage of principal amount redeemed, threshold			40.00%
Debt instrument, redemption price, percentage for first threshold			105.50%
Senior Notes | Twelve-month period beginning October 1, 2020
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			102.75%
Senior Notes | Twelve-month period beginning October 1, 2021
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			101.375%
Senior Notes | Twelve-month period beginning on October 1, 2022
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			100.00%

LONG-TERM DEBT - Revolving Cred

LONG-TERM DEBT - Revolving Credit Agreement Narrative (Details)	Dec. 21, 2018USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Jun. 30, 2020USD ($)
Debt Instrument [Line Items]
Loss on debt extinguishment		$ 396,000	$ 165,000	$ 280,000
Interest expense		$ 24,194,000	27,340,000	28,759,000
Revolving Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 175,000,000
Line of credit facility accordion feature increase limit	$ 275,000,000
Line of credit facility, unused capacity, commitment fee percentage	0.20%
Fixed charge coverage ratio minimum	1
Line of credit facility, excess availability, commitment percentage	10.00%
Debt instrument, covenant period		30 days
Loss on debt extinguishment				100,000
Liquidity position to meet future obligations, amount		$ 384,000,000	308,100,000
Long-term line of credit		45,000,000	45,000,000
Long-term debt					$ 45,000,000
Revolving Credit Agreement | Maximum
Debt Instrument [Line Items]
Line of credit facility, excess availability applied to principal, commitment percentage	15.00%
Revolving Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.25%
Revolving Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.75%
Revolving Credit Agreement | Base Rate | Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.25%
Revolving Credit Agreement | Base Rate | Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.75%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt		0	0
Interest expense		$ 200,000	$ 0	$ 0
Letter of Credit | Revolving Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 15,000,000
Bridge Loan | Revolving Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 17,500,000

LONG-TERM DEBT - New and Old Te

LONG-TERM DEBT - New and Old Term Loan Credit Agreement Narrative (Details) - USD ($)	Sep. 28, 2020	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Loss on debt extinguishment			$ 396,000	$ 165,000	$ 280,000
Interest paid			23,411,000	26,234,000	27,386,000
Principal payments under term loan credit facility			146,393,000	50,470,000	1,880,000
Notes Payable, Other Payables | New Term Loan Credit Agreement
Debt Instrument [Line Items]
Debt instrument, face amount	$ 150,000,000
Percentage of tranche loan amount on equal quarterly installments	0.25%
Debt instrument, LIBOR floor rate	0.75%
Proceeds from issuance of long-term debt	$ 148,500,000
Notes Payable, Other Payables | Old Term Loan Credit Agreement
Debt Instrument [Line Items]
Payment of principal		$ 135,200,000
Loss on debt extinguishment		200,000
Term Loan Credit Agreement | Senior Secured Credit Facility
Debt Instrument [Line Items]
Loss on debt extinguishment		200,000	400,000	200,000	300,000
Repayments of long-term debt			11,200,000
Interest paid			4,800,000	7,800,000	8,000,000
Principal payments under term loan credit facility				50,500,000	1,900,000
Long-term line of credit		138,800,000	138,800,000	135,200,000
Line of credit, current		$ 0	0	0
Amortization of debt issuance costs and discounts			$ 200,000	$ 200,000	$ 200,000
London Interbank Offered Rate (LIBOR) | Notes Payable, Other Payables | New Term Loan Credit Agreement
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.25%
Base Rate | Notes Payable, Other Payables | New Term Loan Credit Agreement
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.25%

LONG-TERM DEBT - Convertible Se

LONG-TERM DEBT - Convertible Senior Notes Narrative (Details) - USD ($)	1 Months Ended	12 Months Ended
	Apr. 30, 2012	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Borrowings under term loan credit facility, net of original issuance discount		$ 148,500,000	$ 0	$ 0
Equity component of convertible senior notes repurchase				35,519,000
Loss on debt extinguishment		$ 396,000	$ 165,000	280,000
Convertible senior notes due 2018
Debt Instrument [Line Items]
Debt instrument convertible conversion amount settled over principal				80,200,000
Debt conversion, converted instrument, amount				44,600,000
Equity component of convertible senior notes repurchase				35,500,000
Loss on debt extinguishment				$ 200,000
Convertible senior notes due 2018
Debt Instrument [Line Items]
Debt instrument, face amount	$ 150,000,000
Notes issued, interest rate	3.375%
Borrowings under term loan credit facility, net of original issuance discount	$ 145,100,000

LONG-TERM DEBT - Contractual Co

LONG-TERM DEBT - Contractual Coupon Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Contractual coupon interest expense	$ 0	$ 0	$ 470
Accretion of discount and fees on the liability component	$ 0	$ 0	$ 461

FINANCIAL DERIVATIVE INSTRUME_3

FINANCIAL DERIVATIVE INSTRUMENTS - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative, notional amount	$ 86.9
Derivative instruments, loss reclassified from accumulated OCI into income over the next 12 months	$ 12.8

FINANCIAL DERIVATIVE INSTRUME_4

FINANCIAL DERIVATIVE INSTRUMENTS - Fair Value Carrying Amount (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Derivatives designated as hedging instruments
Total derivatives designated as hedging instruments	$ 13,384	$ (1,926)
Prepaid expenses and other
Derivatives designated as hedging instruments
Derivative asset, fair value, gross asset	13,750	1,290
Accounts payable and Other accrued liabilities
Derivatives designated as hedging instruments
Derivative liability, fair value, gross liability	$ (366)	$ (3,216)

FINANCIAL DERIVATIVE INSTRUME_5

FINANCIAL DERIVATIVE INSTRUMENTS - Gain or Loss Recognized in Accumulated Other Comprehensive Income (Details) - Commodity swap contracts - Cash Flow Hedging - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion, net of tax)	$ 9,815	$ (2,112)
Amount of Gain (Loss) Reclassified from AOCI into Earnings	$ (7,778)	$ (2,297)	$ 142

LEASES - Narrative (Details)

LEASES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Leased assets obtained in exchange for new operating lease liabilities	$ 2,200
Lessee, operating lease, lease not yet commenced, liability	$ 1,700
Lessee, operating lease, lease not yet commenced, term of contract	10 years
Operating	$ 6,967	$ 10,041
Minimum
Lessee, Lease, Description [Line Items]
Renewal term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Renewal term	5 years

LEASES - Leased Assets and Liab

LEASES - Leased Assets and Liabilities Included Within the Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Right-of-Use Assets
Operating	$ 10,842	$ 14,246
Finance	2,802	2,945
Total leased ROU assets	$ 13,644	$ 17,191
Operating lease, right-of-use asset, statement of financial position [Extensible List]	us-gaap:OtherAssetsNoncurrent	us-gaap:OtherAssetsNoncurrent
Current
Operating	$ 4,117	$ 4,369
Finance	$ 348	$ 327
Operating lease, liability, current, statement of financial position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Noncurrent
Operating	$ 6,967	$ 10,041
Finance	30	378
Total lease liabilities	$ 11,462	$ 15,115
Operating lease, liability, noncurrent, statement of financial position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent

LEASES - Lease Cost (Details)

LEASES - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 5,116	$ 5,172
Finance lease cost
Amortization of ROU leased assets	144	144
Interest on lease liabilities	53	65
Net lease cost	$ 5,313	$ 5,381

LEASES - Maturity of Lease Liab

LEASES - Maturity of Lease Liabilities (Details) $ in Thousands	Dec. 31, 2020USD ($)
Operating Leases
2021	$ 4,569
2022	3,040
2023	2,185
2024	1,085
2025	537
Thereafter	721
Total lease payments	12,137
Less: interest	1,053
Present value of lease payments	11,084
Finance Leases
2021	361
2022	30
2023	0
2024	0
2025	0
Thereafter	0
Total lease payments	391
Less: interest	13
Present value of lease payments	378
Total
2021	4,930
2022	3,070
2023	2,185
2024	1,085
2025	537
Thereafter	721
Total lease payments	$ 12,528

LEASES - Lease Terms and Discou

LEASES - Lease Terms and Discount Rates (Details)	Dec. 31, 2020	Dec. 31, 2019
Weighted average remaining lease term (years)
Operating leases	3 years 7 months 6 days	4 years
Finance leases	1 year 1 month 6 days	2 years 1 month 6 days
Weighted average discount rate
Operating leases	5.07%	5.17%
Finance leases	6.16%	6.16%

LEASES - Lease Costs Included i

LEASES - Lease Costs Included in the Condensed Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 5,091	$ 5,016
Operating cash flows from finance leases	34	53
Financing cash flows from finance leases	$ 327	$ 308	$ 290

FAIR VALUE MEASUREMENTS - Fair

FAIR VALUE MEASUREMENTS - Fair Value Measurements and Fair Value Hierarchy Level of Assets and Liabilities Measure at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Life-insurance contracts	$ 16,930	$ 15,072
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Life-insurance contracts	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Life-insurance contracts	16,930	15,072
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Life-insurance contracts	0	0
Commodity swap contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity swap contracts	13,384	(1,926)
Commodity swap contracts | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity swap contracts	0	0
Commodity swap contracts | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity swap contracts	13,384	(1,926)
Commodity swap contracts | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity swap contracts	0	0
Mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mutual funds	5,331	7,367
Mutual funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mutual funds	5,331	7,367
Mutual funds | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mutual funds	0	0
Mutual funds | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mutual funds	$ 0	$ 0

FAIR VALUE MEASUREMENTS - Carry

FAIR VALUE MEASUREMENTS - Carrying and Estimated Fair Value of Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 447,979	$ 455,386
Senior Notes due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	311,357	320,572
New Term Loan Credit Agreement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	136,622	134,814
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0	0
Level 1 | Senior Notes due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0	0
Level 1 | New Term Loan Credit Agreement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	455,420	455,386
Level 2 | Senior Notes due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	319,140	320,572
Level 2 | New Term Loan Credit Agreement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	136,280	134,814
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0	0
Level 3 | Senior Notes due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0	0
Level 3 | New Term Loan Credit Agreement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 0	$ 0

COMMITMENTS AND CONTINGENCIES -

COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss	$ 100
Purchase obligation	86,900
Chassis converter pool agreements	17,767	$ 10,164
Standby Letters of Credit
Loss Contingencies [Line Items]
Letters of credit outstanding, amount	6,800
Chassis Converter Pool Agreements
Loss Contingencies [Line Items]
Other inventory, gross	$ 2,600

PER SHARE OF COMMON STOCK - Cal

PER SHARE OF COMMON STOCK - Calculation of Basic and Diluted Per Share Of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Basic net (loss) income per share:
Net (loss) income applicable to common stockholders													$ (97,412)	$ 89,575	$ 69,421
Weighted average common shares outstanding (in shares)													52,945,000	54,695,000	56,996,000
Basic net (loss) income per share (in usd per share)	$ 0.10	$ 0.07	$ 0	$ (2.01)	$ 0.34	$ 0.47	$ 0.56	$ 0.27	$ 0.21	$ 0.08	$ 0.55	$ 0.37	$ (1.84)	$ 1.64	$ 1.22
Diluted net (loss) income per share:
Net (loss) income applicable to common stockholders													$ (97,412)	$ 89,575	$ 69,421
Weighted average common shares outstanding (in shares)													52,945,000	54,695,000	56,996,000
Dilutive shares from assumed conversion of convertible senior notes (in shares)													0	0	455,000
Dilutive stock options and restricted stock (in shares)													0	595,000	979,000
Diluted weighted average common shares outstanding (in shares)													52,945,000	55,290,000	58,430,000
Diluted net (loss) income per share (in usd per share)	$ 0.10	$ 0.07	$ 0	$ (2.01)	$ 0.34	$ 0.46	$ 0.56	$ 0.27	$ 0.21	$ 0.08	$ 0.54	$ 0.35	$ (1.84)	$ 1.62	$ 1.19

PER SHARE OF COMMON STOCK - Nar

PER SHARE OF COMMON STOCK - Narrative (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Average diluted shares outstanding (in shares)	0	0	0
Conversion price (in usd per share)			$ 11.70
Dilutive shares from assumed conversion of convertible senior notes (in shares)	0	0	455,000

STOCK-BASED COMPENSATION - Narr

STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended			70 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	May 18, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 4,509	$ 9,036	$ 10,169
Compensation costs not yet recognized	$ 10,900			$ 10,900
Compensation costs not yet recognized, period for recognition	1 year 9 months 18 days
Intrinsic value of options exercised	$ 500	$ 500	$ 1,500
Omnibus Incentive Plan 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)					3,150,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	1,010,802	853,994	593,705
Grant date fair value	$ 12,600	$ 13,000	$ 14,600
Vested in period, fair value	$ 3,700	$ 7,400	$ 15,000
Restricted Stock | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Restricted Stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Options granted (in shares)				0
Expiration period	10 years

STOCK-BASED COMPENSATION - Summ

STOCK-BASED COMPENSATION - Summary of Restricted Stock Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of Shares
Balance beginning of period (in shares)	531,942
Vested (in shares)	(113,312)
Forfeited (in shares)	0
Balance end of period (in shares)	414,080	531,942
Weighted Average Grant Date Fair Value
Balance beginning of period (in usd per share)	$ 11.54
Vested (in usd per share)	11.24
Forfeited (in usd per share)	0
Balance end of period (in usd per share)	$ 11.60	$ 11.54
Restricted Stock
Number of Shares
Balance beginning of period (in shares)	1,691,699
Granted (in shares)	1,010,802	853,994	593,705
Vested (in shares)	(314,048)
Forfeited (in shares)	(556,074)
Balance end of period (in shares)	1,832,379	1,691,699
Weighted Average Grant Date Fair Value
Balance beginning of period (in usd per share)	$ 20.24
Granted (in usd per share)	12.43
Vested (in usd per share)	19.60
Forfeited (in usd per share)	20.56
Balance end of period (in usd per share)	$ 16.06	$ 20.24

STOCK-BASED COMPENSATION - Su_2

STOCK-BASED COMPENSATION - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of Shares
Balance beginning of period (in shares)	531,942
Exercised (in shares)	(113,312)
Forfeited (in shares)	0
Expired (in shares)	(4,550)
Balance end of period (in shares)	414,080	531,942
Options Exercisable (in shares)	368,333
Weighted Average Grant Date Fair Value
Balance beginning of period (in usd per share)	$ 11.54
Exercised (in usd per share)	11.24
Forfeited (in usd per share)	0
Expired (in shares)	13.74
Balance end of period (in usd per share)	11.60	$ 11.54
Options Exercisable (in usd per share)	$ 11.67
Weighted Average Remaining Contractual Life
Options Outstanding	2 years 2 months 12 days	3 years 1 month 6 days
Options Exercisable at End of Period	2 years 3 months 18 days
Aggregate Intrinsic Value ($ in millions)
Options outstanding	$ 2.3	$ 1.7
Exercised	0.5	$ 0.5	$ 1.5
Options Exercisable	$ 2

STOCKHOLDERS' EQUITY - Narrativ

STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($)	1 Months Ended
	Nov. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Feb. 28, 2017	Feb. 29, 2016
Class of Stock [Line Items]
Stock repurchase program, authorized amount	$ 100,000,000			$ 100,000,000	$ 100,000,000
Stock repurchase program, period in force	3 years
Stock repurchase program, remaining authorized repurchase amount		$ 51,400,000
Common stock, shares authorized (in shares)		200,000,000	200,000,000
Common stock, par value (in usd per share)		$ 0.01	$ 0.01
Preferred Class A
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)		25,000,000

STOCKHOLDERS' EQUITY - Accumula

STOCKHOLDERS' EQUITY - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 520,988	$ 473,849	$ 506,063
Net unrealized gains (losses) arising during the period(a)	5,795	(2,347)	(853)
Less: Net realized gains (losses) reclassified to net income(b)	(5,816)	(1,712)	105
Total other comprehensive income (loss)	11,611	(635)	(958)
Balance at end of period	404,879	520,988	473,849
Foreign Currency Translation and Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(1,866)	(2,578)	(2,385)
Net unrealized gains (losses) arising during the period(a)	(316)	712	(193)
Less: Net realized gains (losses) reclassified to net income(b)	0	0	0
Total other comprehensive income (loss)	(316)	712	(193)
Balance at end of period	(2,182)	(1,866)	(2,578)
Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(2,112)	(765)	0
Net unrealized gains (losses) arising during the period(a)	6,111	(3,059)	(660)
Less: Net realized gains (losses) reclassified to net income(b)	(5,816)	(1,712)	105
Total other comprehensive income (loss)	11,927	(1,347)	(765)
Balance at end of period	9,815	(2,112)	(765)
Net unrealized gains (losses) arising during period, tax expense (benefit)	2,058	(1,031)	(230)
Net realized gains (losses) reclassified to net income, tax expense (benefit)	(1,962)	(585)	37
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(3,978)	(3,343)	(2,385)
Balance at end of period	$ 7,633	$ (3,978)	$ (3,343)

EMPLOYEE SAVINGS PLANS - Narrat

EMPLOYEE SAVINGS PLANS - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Employee Savings Plans [Abstract]
Labor and related expense	$ 7.9	$ 10.2	$ 7.9

INCOME TAXES - Consolidated Inc

INCOME TAXES - Consolidated Income (loss) Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Domestic	$ (110,049)	$ 116,886	$ 94,978
Foreign	835	845	1,026
(Loss) income before income tax	$ (109,214)	$ 117,731	$ 96,004

INCOME TAXES - Narrative (Detai

INCOME TAXES - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income tax receivable, CARES Act	$ 13.2
Deferred tax assets, operating loss carryforwards, state and local	1	$ 0.8
Deferred tax assets, operating loss carryforwards, domestic	87
Unrecognized tax benefits that would impact effective tax rate	2.2	2.1
Unrecognized tax benefits, income tax penalties and interest accrued	$ 0.7	$ 0.7

INCOME TAXES - Consolidated I_2

INCOME TAXES - Consolidated Income Tax Expense (benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current
Federal	$ (15,190)	$ 18,167	$ 22,120
State	(2,072)	6,233	7,271
Foreign	444	336	168
Current	(16,818)	24,736	29,559
Deferred
Federal	7,918	2,760	(1,613)
State	(2,959)	620	(1,312)
Foreign	57	40	(51)
Deferred	5,016	3,420	(2,976)
Total consolidated (benefit) expense	$ (11,802)	$ 28,156	$ 26,583

INCOME TAXES - Reconciliation o

INCOME TAXES - Reconciliation of Differences from U.S. Federal Statutory Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Pretax book (loss) income	$ (109,214)	$ 117,731	$ 96,004
Federal tax (benefit) expense at applicable statutory rate	(22,935)	24,723	20,161
State and local income taxes (net of federal benefit)	(4,948)	5,513	4,737
Rate differential	(5,004)	0	0
Goodwill impairment	20,111	0	0
Tax credits	0	(3,301)	0
Remeasurement of deferred taxes	0	0	(421)
Nondeductible officer compensation	490	0	1,152
Compensation expense	1,070	1,317	(1,009)
Other	(586)	(96)	1,963
Total consolidated (benefit) expense	$ (11,802)	$ 28,156	$ 26,583

INCOME TAXES - Components of De

INCOME TAXES - Components of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets
Tax credits and loss carryforwards	$ 2,518	$ 672
Accrued liabilities	6,415	7,489
Incentive compensation	9,202	14,420
Other	328	5,423
Deferred tax assets	18,463	28,004
Deferred tax liabilities
Property, plant and equipment	(22,355)	(17,899)
Intangibles	(40,043)	(44,477)
Other	(1,822)	(2,379)
Deferred tax liabilities	(64,220)	(64,755)
Net deferred tax liability before valuation allowances and reserves	(45,757)	(36,751)
Valuation allowances	(1,020)	(825)
Net deferred tax liability	$ (46,777)	$ (37,576)

INCOME TAXES - Reconciliation_2

INCOME TAXES - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance beginning of period	$ 1,422	$ 1,177
Increase in prior year tax positions	84	245
Balance end of period	$ 1,506	$ 1,422

SEGMENTS - Narrative (Details)

SEGMENTS - Narrative (Details)	12 Months Ended
	Dec. 31, 2020segmentbusiness_unit	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Number of reportable segments | segment	3
Five Largest Customers | Sales revenue, net
Segment Reporting Information [Line Items]
Concentration risk percentage	21.00%	27.00%	25.00%
Diversified Products
Segment Reporting Information [Line Items]
Number of reporting units | business_unit	3

SEGMENTS - Reportable Segment I

SEGMENTS - Reportable Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net sales
Net sales	$ 404,078	$ 351,584	$ 339,153	$ 387,074	$ 579,001	$ 580,908	$ 626,053	$ 533,174	$ 610,196	$ 553,073	$ 612,690	$ 491,319	$ 1,481,889	$ 2,319,136	$ 2,267,278
Depreciation and amortization													47,970	42,357	40,683
Income (Loss) from operations													(85,608)	142,786	110,987
Assets	1,161,470				1,304,591				1,304,393				1,161,470	1,304,591	1,304,393
Commercial Trailer Products
Net sales
Net sales													992,528	1,519,592	1,536,687
Diversified Products
Net sales
Net sales													270,963	357,634	372,342
Final Mile Products
Net sales
Net sales													218,398	441,910	358,249
Operating Segments | Commercial Trailer Products
Net sales
Net sales													992,776	1,521,541	1,536,939
Depreciation and amortization													11,557	10,667	9,631
Income (Loss) from operations													79,662	145,877	141,795
Assets	306,587				362,328				355,183				306,587	362,328	355,183
Operating Segments | Diversified Products
Net sales
Net sales													294,134	384,516	393,971
Depreciation and amortization													19,300	18,621	21,177
Income (Loss) from operations													1,563	29,748	(3,033)
Assets	278,643				317,246				349,423				278,643	317,246	349,423
Operating Segments | Final Mile Products
Net sales
Net sales													218,398	441,910	358,249
Depreciation and amortization													14,891	11,361	8,314
Income (Loss) from operations													(123,585)	9,804	7,907
Assets	375,115				511,862				484,634				375,115	511,862	484,634
Corporate and Eliminations
Net sales
Net sales													(23,419)	(28,831)	(21,881)
Depreciation and amortization													2,222	1,708	1,561
Income (Loss) from operations													(43,248)	(42,643)	(35,682)
Assets	$ 201,125				$ 113,155				$ 115,153				201,125	113,155	115,153
Corporate and Eliminations | Commercial Trailer Products
Net sales
Net sales													248	1,949	252
Corporate and Eliminations | Diversified Products
Net sales
Net sales													23,171	26,882	21,629
Corporate and Eliminations | Final Mile Products
Net sales
Net sales													$ 0	$ 0	$ 0

SEGMENTS - Major Product Catego

SEGMENTS - Major Product Categories and Percentage of Consolidated Net Sales (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Product Information [Line Items]
Net sales	$ 404,078	$ 351,584	$ 339,153	$ 387,074	$ 579,001	$ 580,908	$ 626,053	$ 533,174	$ 610,196	$ 553,073	$ 612,690	$ 491,319	$ 1,481,889	$ 2,319,136	$ 2,267,278
New trailers
Product Information [Line Items]
Net sales													1,087,820	1,662,679	1,638,373
Used trailers
Product Information [Line Items]
Net sales													8,386	2,479	13,132
Components, parts and service
Product Information [Line Items]
Net sales													114,048	140,489	145,250
Equipment and other
Product Information [Line Items]
Net sales													271,635	513,489	470,523
Commercial Trailer Products
Product Information [Line Items]
Net sales													992,528	1,519,592	1,536,687
Diversified Products
Product Information [Line Items]
Net sales													270,963	357,634	372,342
Final Mile Products
Product Information [Line Items]
Net sales													218,398	441,910	358,249
Operating Segments | Commercial Trailer Products
Product Information [Line Items]
Net sales													992,776	1,521,541	1,536,939
Operating Segments | Commercial Trailer Products | New trailers
Product Information [Line Items]
Net sales													941,932	1,464,636	1,473,583
Operating Segments | Commercial Trailer Products | Used trailers
Product Information [Line Items]
Net sales													3,841	435	9,618
Operating Segments | Commercial Trailer Products | Components, parts and service
Product Information [Line Items]
Net sales													36,912	40,344	34,994
Operating Segments | Commercial Trailer Products | Equipment and other
Product Information [Line Items]
Net sales													10,091	16,126	18,744
Operating Segments | Diversified Products
Product Information [Line Items]
Net sales													294,134	384,516	393,971
Operating Segments | Diversified Products | New trailers
Product Information [Line Items]
Net sales													145,888	198,043	164,790
Operating Segments | Diversified Products | Used trailers
Product Information [Line Items]
Net sales													4,545	2,044	3,514
Operating Segments | Diversified Products | Components, parts and service
Product Information [Line Items]
Net sales													88,010	113,024	122,099
Operating Segments | Diversified Products | Equipment and other
Product Information [Line Items]
Net sales													55,691	71,405	103,568
Operating Segments | Final Mile Products
Product Information [Line Items]
Net sales													218,398	441,910	358,249
Operating Segments | Final Mile Products | New trailers
Product Information [Line Items]
Net sales													0		0
Operating Segments | Final Mile Products | Used trailers
Product Information [Line Items]
Net sales													0	0	0
Operating Segments | Final Mile Products | Components, parts and service
Product Information [Line Items]
Net sales													12,517	15,023	9,968
Operating Segments | Final Mile Products | Equipment and other
Product Information [Line Items]
Net sales													205,881	426,887	348,281
Corporate and Eliminations
Product Information [Line Items]
Net sales													(23,419)	(28,831)	(21,881)
Corporate and Eliminations | New trailers
Product Information [Line Items]
Net sales													0	0	0
Corporate and Eliminations | Used trailers
Product Information [Line Items]
Net sales													0	0	0
Corporate and Eliminations | Components, parts and service
Product Information [Line Items]
Net sales													(23,391)	(27,902)	(21,811)
Corporate and Eliminations | Equipment and other
Product Information [Line Items]
Net sales													(28)	(929)	(70)
Corporate and Eliminations | Commercial Trailer Products
Product Information [Line Items]
Net sales													248	1,949	252
Corporate and Eliminations | Diversified Products
Product Information [Line Items]
Net sales													23,171	26,882	21,629
Corporate and Eliminations | Final Mile Products
Product Information [Line Items]
Net sales													$ 0	$ 0	$ 0
Product Concentration Risk | Sales revenue, net
Product Information [Line Items]
Percentage of consolidated net sales													100.00%	100.00%	100.00%
Product Concentration Risk | New trailers | Sales revenue, net
Product Information [Line Items]
Percentage of consolidated net sales													73.40%	71.70%	72.20%
Product Concentration Risk | Used trailers | Sales revenue, net
Product Information [Line Items]
Percentage of consolidated net sales													0.60%	0.10%	0.60%
Product Concentration Risk | Components, parts and service | Sales revenue, net
Product Information [Line Items]
Percentage of consolidated net sales													7.70%	6.10%	6.40%
Product Concentration Risk | Equipment and other | Sales revenue, net
Product Information [Line Items]
Percentage of consolidated net sales													18.30%	22.10%	20.80%

DIVESTITURES AND SALES (Details

DIVESTITURES AND SALES (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impact of divestiture on goodwill			$ 4,685	$ 4,944
Proceeds from sale of property, plant, and equipment	$ 3,200	$ 2,700	17,115	785	$ 17,776
Gain (loss) on disposition of property plant equipment	2,300	$ 1,700	1,567	$ 109	$ 10,148
Term Loan Credit Agreement | Senior Secured Credit Facility
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Repayments of long-term debt			$ 11,200
Beall Tank Trailers | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of businesses	11,200
Loss on divestiture	2,100
Impact of divestiture on goodwill	$ 4,700

CONSOLIDATED QUARTERLY FINANC_3

CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED) - Summary of the Unaudited Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Data [Abstract]
Net sales	$ 404,078	$ 351,584	$ 339,153	$ 387,074	$ 579,001	$ 580,908	$ 626,053	$ 533,174	$ 610,196	$ 553,073	$ 612,690	$ 491,319	$ 1,481,889	$ 2,319,136	$ 2,267,278
Gross profit	45,496	43,194	34,321	36,743	72,307	77,735	87,650	68,690	69,056	65,162	85,315	64,119	159,754	306,382	283,651
Net (loss) income	$ 5,494	$ 3,887	$ (146)	$ (106,647)	$ 18,375	$ 25,460	$ 30,960	$ 14,780	$ 11,584	$ 4,664	$ 31,902	$ 21,272	$ (97,412)	$ 89,575	$ 69,421
Basic net (loss) income per share (in usd per share)	$ 0.10	$ 0.07	$ 0	$ (2.01)	$ 0.34	$ 0.47	$ 0.56	$ 0.27	$ 0.21	$ 0.08	$ 0.55	$ 0.37	$ (1.84)	$ 1.64	$ 1.22
Diluted net (loss) income per share (in usd per share)	$ 0.10	$ 0.07	$ 0	$ (2.01)	$ 0.34	$ 0.46	$ 0.56	$ 0.27	$ 0.21	$ 0.08	$ 0.54	$ 0.35	$ (1.84)	$ 1.62	$ 1.19