ChampionX (CHX) 10-K 2 Mar 20 2019 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 26, 2020	Jun. 28, 2019
Cover page.
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-38441
Entity Registrant Name	Apergy Corporation
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	82-3066826
Entity Address, Address Line One	2445 Technology Forest Blvd
Entity Address, Address Line Two	Building 4, 12th Floor
Entity Address, City or Town	The Woodlands,
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77381
City Area Code	281
Local Phone Number	403-5772
Title of 12(b) Security	Common stock, $0.01 par value
Trading Symbol	APY
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 2,575,029,140
Entity Common Stock, Shares Outstanding		77,492,835
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement relating to its 2020 annual meeting of stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated, or such information will be included in an amendment to this Form 10-K in accordance with Instruction G(3) of Form 10-K.
Entity Central Index Key	0001723089
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands		3 Months Ended								12 Months Ended
		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, 2019		Dec. 31, 2018		Dec. 31, 2017
Total revenue		$ 247,748	$ 276,839	$ 306,170	$ 300,494	$ 313,133	$ 316,171	$ 305,747	$ 283,105	$ 1,131,251		$ 1,218,156		$ 1,010,466
Cost of goods and services										754,147		801,152		690,398
Gross profit		72,634	92,699	108,760	103,011	106,595	112,327	104,090	93,992	377,104		417,004		320,068
Selling, general and administrative expense										276,014		264,947		221,407
Interest expense, net										39,301		27,648		863
Other expense, net										2,603		3,056		9,443
Income before income taxes										59,186		121,353		88,355
Provision for (benefit from) income taxes										6,226		28,162		(22,164)
Net income		(1,574)	11,588	23,008	19,938	23,347	24,015	21,879	23,950	52,960		93,191		110,519
Net income attributable to noncontrolling interest										796		454		930
Net income attributable to Apergy		$ (1,823)	$ 11,394	$ 22,937	$ 19,656	$ 23,187	$ 23,961	$ 21,816	$ 23,773	$ 52,164		$ 92,737		$ 109,589
Earnings per share attributable to Apergy:
Basic (in dollars per share)		$ (0.02)	$ 0.15	$ 0.30	$ 0.25	$ 0.30	$ 0.31	$ 0.28	$ 0.31	$ 0.67	[1]	$ 1.20	[1]	$ 1.42	[1]
Diluted (in dollars per share)		$ (0.02)	$ 0.15	$ 0.30	$ 0.25	$ 0.30	$ 0.31	$ 0.28	$ 0.31	$ 0.67	[1]	$ 1.19	[1]	$ 1.41	[1]
Weighted-average shares outstanding:
Basic (in shares)	[1]									77,427		77,342		77,340
Diluted (in shares)	[1]									77,624		77,692		77,890
Product revenue
Revenue										$ 1,000,630		$ 1,090,218		$ 922,692
Other revenue
Revenue										$ 130,621		$ 127,938		$ 87,774
[1]	See Note 4—Earnings Per Share .

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income		$ 52,960	$ 93,191	$ 110,519
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	[1]	936	(14,210)	4,385
Pension and other post-retirement benefit plans:
Net actuarial gain (loss) arising during period		(2,521)	856	2,598
Prior service cost arising during period		(190)	0	0
Reclassification adjustment for net actuarial loss included in net income		272	247	257
Reclassification adjustment for prior service costs included in net income		1	0	1
Reclassification adjustment for settlement losses included in net income		371	353	0
Total pension and other post-retirement benefit plans	[2]	(2,067)	1,456	2,856
Other comprehensive income (loss)		(1,131)	(12,754)	7,241
Comprehensive income		51,829	80,437	117,760
Comprehensive income attributable to noncontrolling interest		796	454	930
Comprehensive income attributable to Apergy		$ 51,033	$ 79,983	$ 116,830
[1]	Net of income tax (expense) benefit of nil for the years ended December 31, 2019, 2018 and 2017, respectively.
[2]	Net of income tax (expense) benefit of $347 , $352 and $971 for the years ended December 31, 2019, 2018 and 2017, respectively.

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustments, tax	$ 0	$ 0	$ 0
Pension and other post-retirement benefit plans, tax	$ 347	$ 352	$ 971

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents	$ 35,290	$ 41,832
Receivables, net of allowances of $8,072 in 2019 and $4,745 in 2018	219,874	251,436
Inventories, net	211,342	219,421
Prepaid expenses and other current assets	26,934	18,534
Total current assets	493,440	531,223
Property, plant and equipment, net	248,181	244,328
Goodwill	911,113	904,985
Intangible assets, net	238,707	283,688
Other non-current assets	31,384	8,892
Total assets	1,922,825	1,973,116
Liabilities and Equity
Accounts payable	120,291	140,125
Accrued compensation and employee benefits	38,470	40,546
Current portion of finance lease liabilities	4,845
Current portion of finance lease liabilities		4,320
Accrued expenses and other current liabilities	36,075	28,761
Total current liabilities	199,681	213,752
Long-term debt	559,821	663,207
Deferred income taxes	84,060	99,772
Other long-term liabilities	43,049	20,402
Total liabilities	886,611	997,133
Stockholders’ equity:
Common stock (2.5 billion shares authorized, $0.01 par value) 77.5 million shares and 77.4 million shares issued and outstanding in 2019 and 2018, respectively	775	774
Capital in excess of par value of common stock	969,174	960,773
Retained earnings	107,048	54,884
Accumulated other comprehensive loss	(44,037)	(42,906)
Total stockholders’ equity	1,032,960	973,525
Noncontrolling interest	3,254	2,458
Total equity	1,036,214	975,983
Total liabilities and equity	$ 1,922,825	$ 1,973,116

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 8,072	$ 4,745
Par value of common stock (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	2,500,000,000	2,500,000,000
Common stock, shares issued (in shares)	77,500,000	77,400,000
Common stock, shares outstanding (in shares)	77,500,000	77,400,000

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash provided (required) by operating activities:
Net income	$ 52,960	$ 93,191	$ 110,519
Adjustments to reconcile net income (loss) to net cash provided (required) by operating activities:
Depreciation	68,557	72,569	59,161
Amortization	51,381	51,892	53,701
Stock-based compensation	10,250	5,375	2,236
Loss (gain) on sale of fixed assets and business, net	429	(1,173)	(934)
Impairment of long-lived assets	1,874	990	3,581
Provision for doubtful accounts	4,955	2,007	954
Amortization of deferred loan costs and accretion of discount	2,590	1,671	0
Deferred income taxes	(13,874)	1,492	(73,501)
Employee benefit plan expense	1,883	3,340	1,064
Other	3,464	1,885	(6,142)
Changes in operating assets and liabilities (net of effects of acquisitions and foreign exchange):
Receivables	25,948	(55,378)	(61,573)
Inventories	19,065	(40,018)	(13,808)
Prepaid expenses and other current assets	(10,742)	(3,750)	(5,116)
Accounts payable	(20,526)	40,393	31,827
Accrued compensation and employee benefits	(6,358)	8,454	5,616
Accrued expenses and other liabilities	4,406	12,095	(165)
Leased assets	(40,700)	(25,867)	(27,788)
Other	337	(5,268)	(3,582)
Net cash provided by operating activities	155,899	163,900	76,050
Cash provided (required) by investing activities:
Capital expenditures	(39,780)	(57,918)	(36,654)
Proceeds from sale of fixed assets	4,598	1,187	3,547
Proceeds from (payment on) sale of businesses	(2,194)
Proceeds from (payment on) sale of businesses		2,473	0
Acquisition (net of cash and cash equivalents acquired)	(12,500)	0	(8,842)
Purchase price adjustments on acquisition	0	53	0
Net cash required by investing activities	(49,876)	(54,205)	(41,949)
Cash provided (required) by financing activities:
Proceeds from long-term debt, net of discounts	36,500	713,963	0
Payment of debt issue costs	0	(16,006)	0
Repayment of long-term debt	(141,500)	(45,000)	(599)
Distributions to Dover Corporation, net	0	(736,557)	(31,192)
Distribution to noncontrolling interest	0	(2,720)	(1,212)
Payment of capital lease obligations	(5,555)	(4,518)	(3,690)
Payments related to taxes withheld on stock-based compensation	(1,848)	0	0
Net cash required by financing activities	(112,403)	(90,838)	(36,693)
Effect of exchange rate changes on cash and cash equivalents	(162)	(737)	277
Net increase (decrease) in cash and cash equivalents	(6,542)	18,120	(2,315)
Cash and cash equivalents at beginning of period	41,832	23,712	26,027
Cash and cash equivalents at end of period	$ 35,290	$ 41,832	$ 23,712

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock, Par Value	Common Stock, Capital in excess of par value	Retained Earnings	Net Parent Investment in Apergy	Accum. Other Comp. Loss	Non- controlling Interest
Beginning Balance at Dec. 31, 2016	$ 1,548,504	$ 0	$ 0	$ 0	$ 1,577,130	$ (33,657)	$ 5,031
Net income	110,519				109,589		930
Other comprehensive income (loss)	7,241					7,241
Distributions to noncontrolling interest	(1,212)						(1,212)
Net transfers to/from Dover	(29,543)				(29,543)
Ending Balance at Dec. 31, 2017	1,635,509	0	0	0	1,657,176	(26,416)	4,749
Net income	93,191			54,884	37,853		454
Other comprehensive income (loss)	(12,754)					(12,754)
Distributions to noncontrolling interest	(2,720)						(2,720)
Net transfers to/from Dover	(742,054)				(739,633)	(2,421)
Reclassification of net parent investment in Apergy	0		956,711		(956,711)
Issuance of common stock	0	773	(773)
Stock-based compensation	4,836	1	4,835
Other	(25)						(25)
Ending Balance at Dec. 31, 2018	975,983	774	960,773	54,884	0	(42,906)	2,458
Net income	52,960			52,164			796
Other comprehensive income (loss)	(1,131)					(1,131)
Stock-based compensation	10,250	1	10,249
Taxes withheld on issuance of stock-based awards	(1,848)		(1,848)
Ending Balance at Dec. 31, 2019	$ 1,036,214	$ 775	$ 969,174	$ 107,048	$ 0	$ (44,037)	$ 3,254

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Apergy Corporation is a leading provider of highly engineered equipment and technologies that help companies drill for and produce oil and gas safely and efficiently around the world. Our products provide efficient functioning throughout the lifecycle of a well—from drilling to completion to production. We report our results of operations in the following reporting segments: Production & Automation Technologies and Drilling Technologies. Our Production & Automation Technologies segment offerings consist of artificial lift equipment and solutions, including rod pumping systems, electric submersible pump systems, progressive cavity pumps and drive systems and plunger lifts, as well as a full automation and digital offering consisting of equipment, software and Industrial Internet of Things solutions for downhole monitoring, wellsite productivity enhancement and asset integrity management. Our Drilling Technologies segment offerings provide market leading polycrystalline diamond cutters and bearings that result in cost effective and efficient drilling. Separation and Distribution On May 9, 2018, Apergy became an independent, publicly traded company as a result of the distribution by Dover Corporation (“Dover”) of 100% of the outstanding common stock of Apergy to Dover’s stockholders. Dover’s Board of Directors approved the distribution on April 18, 2018 and Apergy’s Registration Statement on Form 10 was declared effective by the U.S. Securities and Exchange Commission (“SEC”) on April 19, 2018. On May 9, 2018, Dover’s stockholders of record as of the close of business on the record date of April 30, 2018 received one share of Apergy stock for every two shares of Dover stock held at the close of business on the record date (the “Separation”). Following the Separation, Dover retained no ownership interest in Apergy. Apergy’s common stock began “regular-way” trading on the New York Stock Exchange (“NYSE”) under the “APY” symbol on May 9, 2018. Basis of Presentation Our consolidated financial statements were prepared in U.S. dollars and in accordance with U.S. generally accepted accounting principles (“GAAP”). Prior to the Separation, our results of operations, financial position and cash flows were derived from the consolidated financial statements and accounting records of Dover and reflect the combined historical results of operations, financial position and cash flows of certain Dover entities conducting its upstream oil and gas energy business within Dover’s Energy segment, including an allocated portion of Dover’s corporate costs. These financial statements have been presented as if such businesses had been combined for all periods prior to the Separation. All intercompany transactions and accounts within Dover were eliminated. The assets and liabilities were reflected on a historical cost basis since all of the assets and liabilities presented were wholly owned by Dover and were transferred within the Dover consolidated group. The statements of income also include expense allocations for certain corporate functions historically performed by Dover and not allocated to its operating segments, including corporate executive management, human resources, information technology, facilities, tax, shared services, finance and legal, including the costs of salaries, benefits and other related costs. These expense allocations were based on direct usage or benefit where identifiable, with the remainder allocated on the basis of revenue, headcount or other measures. These pre-Separation combined financial statements may not include all of the actual expenses that would have been incurred had we been a stand-alone public company during the periods presented prior to the Separation and consequently may not reflect our results of operations, financial position and cash flows had we been a stand-alone public company during the periods presented prior to the Separation. Actual costs that would have been incurred if we had been a stand-alone public company would depend on a variety of factors, including organizational structure and strategic decisions made in various areas, including information technology and infrastructure. Prior to the Separation, transactions between Apergy and Dover, with the exception of transactions discussed in Note 3—Related Party Transactions , are reflected in the combined statements of cash flows as a financing activity in “Distributions to Dover Corporation, net.” See Note 3—Related Party Transactions for additional information. No portion of Dover’s third-party debt was historically held by an Apergy entity or was transferred to Apergy; therefore, no interest expense was presented in the combined statements of income for each of the periods presented prior to the Separation. Intercompany notes payable to Dover were presented within “Net parent investment in Apergy” in our combined balance sheet because the notes were not settled in cash. Accordingly, no interest expense related to intercompany debt was presented in the combined statements of income for each of the periods presented prior to the Separation. All financial information presented after the Separation represents the consolidated results of operations, financial position and cash flows of Apergy. Accordingly, our results of operations and cash flows consist of the consolidated results of Apergy from May 9, 2018 to December 31, 2019, and the combined results of operations and cash flows for periods prior to May 9, 2018. Our balance sheets as of December 31, 2019 and 2018, reflect the consolidated balances of Apergy. Our management believes the assumptions underlying these consolidated financial statements, including the assumptions regarding the allocation of corporate expenses from Dover for periods prior to the Separation, are reasonable. The legal transfer of the upstream oil and gas energy businesses from Dover to Apergy occurred on May 9, 2018; however, for ease of reference, and unless otherwise stated or the context otherwise requires, all references to “Apergy Corporation,” “Apergy,” “we,” “us” or “our” refer (i) prior to the Separation, to the Apergy businesses, consisting of entities, assets and liabilities conducting the upstream oil and gas business within Dover’s Energy segment and (ii) after the Separation, to Apergy Corporation and its consolidated subsidiaries. Significant Accounting Policies Use of estimates— The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. Such estimates include, but are not limited to, net realizable value of inventories, allowance for doubtful accounts, pension and post-retirement plans, future cash flows associated with impairment testing of goodwill, indefinite-lived intangible assets and other long-lived assets, estimates related to income taxes and estimates related to contingencies. Cash and cash equivalents— Cash equivalents are highly liquid, short-term investments with original maturities of three months or less from their date of purchase. Receivables, net of allowances— An allowance for doubtful accounts is provided on receivables equal to the estimated uncollectible amounts. This estimate is based on historical collection experience, current economic and market conditions and a review of the current status of each customer’s trade accounts receivable. Inventories— Inventories for the majority of our subsidiaries, including all international subsidiaries, are stated at the lower of cost, determined on the first-in, first-out (FIFO) basis, or net realizable value. Other domestic inventories are stated at the lower of cost, determined on the last-in, first-out (LIFO) basis, or market. Under the LIFO method, the cost assigned to items sold is based on the cost of the most recent items purchased. As a result, the costs of the first items purchased remain in inventory and are used to value ending inventory. Property, plant and equipment— Property, plant and equipment is recorded at cost. Depreciation is provided on the straight-line basis over the estimated useful lives of our assets as follows: buildings and improvements 5 to 31.5 years; machinery and equipment 1 to 7 years; and software 3 to 10 years. Expenditures for maintenance and repairs are expensed as incurred. Gains and losses are realized upon the sale or disposition of assets and are recorded in “Other expense, net” on our consolidated statements of income. Property, plant and equipment are reviewed for impairment whenever events or changes in circumstances indicate the carrying value of the long-lived asset may not be recoverable. The carrying value of a long-lived asset is not recoverable if it exceeds the sum of undiscounted cash flows expected to result from the use and eventual disposition of the asset. If it is determined that an impairment loss has occurred, the impairment loss is measured as the amount by which the carrying value of the long-lived asset exceeds its fair value. Goodwill and other intangible assets— Goodwill is not subject to amortization but is tested for impairment on an annual basis or more frequently if impairment indicators arise. We have established October 1 as the date of our annual test for impairment of goodwill. A quantitative test is used to determine the existence of goodwill impairment and the amount of the impairment loss at the reporting unit level. The quantitative test compares the fair value of a reporting unit with its carrying amount, including goodwill. We use an income-based valuation method, determining the present value of estimated future cash flows, to estimate the fair value of a reporting unit. Significant assumptions used in estimating our reporting unit fair values include (i) annual revenue growth rates; (ii) operating margins; (iii) risk-adjusted discount rate; and (iv) terminal value determined using a long-term growth rate. If the carrying amount of a reporting unit exceeds its fair value, an impairment loss will be recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to the reporting unit. Our finite-lived acquired intangible assets are amortized on a straight-line basis over their estimated useful lives, which generally range from 5 to 15 years. Intangible assets are reviewed for impairment whenever events or changes in circumstances indicate the carrying amount of the intangible asset may not be recoverable. The carrying amount of an intangible asset is not recoverable if it exceeds the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the asset. If it is determined that an impairment loss has occurred, the loss is measured as the amount by which the carrying amount of the intangible asset exceeds its fair value. We have one intangible asset with an indefinite life which is tested annually for impairment. Revenue Recognition— Prior to January 1, 2018, revenue was recognized when all of the following conditions were satisfied: a) persuasive evidence of an arrangement exists, b) price is fixed or determinable, c) collectability is reasonably assured and d) delivery has occurred or services have been rendered. Beginning in 2018, and in connection with the adoption of ASC Topic 606, revenue is recognized to depict the transfer of control of the related goods and services to the customer. The majority of our revenue is generated through the manufacture and sale of a broad range of specialized products and components, with revenue recognized upon transfer of title and risk of loss, which is generally upon shipment. We account for shipping and handling activities performed after control of a good has been transferred to the customer as a contract fulfillment cost rather than a separate performance obligation. In limited cases, revenue arrangements with customers require delivery, installation, testing, or other acceptance provisions to be satisfied before revenue is recognized. Service revenue is recognized as the services are performed. Software product revenue is recorded when the software product is shipped to the customer or over the term of the contract on a subscription based model. Estimates are used to determine the amount of variable consideration in contracts, as well as the determination of the standalone selling price among separate performance obligations. Some contracts with customers include variable consideration primarily related to volume rebates. We estimate variable consideration at the most likely amount to determine the total consideration which we expect to be entitled. Estimated amounts are included in the transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. Our estimates of variable consideration and the determination of whether to include estimated amounts in the transaction price are largely based on an assessment of our anticipated performance and all information that is reasonably available. We exclude all taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction and collected from a customer (e.g., sales, use, value added, and some excise taxes) from the determination of the transaction price. Lessor accounting —Our lease arrangements generally allow customers to rent equipment on a daily basis with no stated end date. Customers may return the equipment at any point subsequent to the lease commencement date without penalty. We account for these arrangements as a daily renewal option beginning on the lease commencement date, with the lease term determined as the period in which it is reasonably certain the option will be exercised. Based on our assessment of the lease classification criteria, our lease arrangements have been classified as operating leases. Our lease arrangements generally include lease and non-lease components for which revenue is recognized based on each component’s standalone price. Lease revenue is recognized on a straight-line basis over the term of the lease and is included in “Other revenue” in the consolidated statement of income. Non-lease revenue related to our lease arrangements is recognized in accordance with our revenue recognition accounting policy. Assets in our lease program are reported in “Property, plant, and equipment, net” on our consolidated balance sheets and are depreciated over their estimated useful lives to an estimated salvage value. Leased equipment damaged in operation is generally charged to the customer. Charges for damaged leased equipment is recorded as “Product revenue” and the remaining net book value of the leased asset is expensed as “Costs of goods and services” in the consolidated statements of income. Lessee accounting —Lease liabilities are measured at the lease commencement date and are based on the present value of remaining payments contractually required under the contract. Payments that are variable in nature are excluded from the measurement of our lease liabilities and are recorded as an expense as incurred. Options to renew or extend a lease are included in the measurement of our lease liabilities only when it is reasonably certain that we will exercise these rights. In estimating the present value of our lease liabilities, payments are discounted at our incremental borrowing rate (“IBR”), which has been applied utilizing a portfolio approach. We utilized information publicly available from companies within our industry with similar credit profiles to construct a company-specific yield curve in order to estimate the rate of interest we would pay to borrow at various lease terms. At lease commencement, we recognize a lease right-of-use asset equal to our lease liability, adjusted for lease payments paid to the lessor prior to the lease commencement date, and any initial direct costs incurred. Operating lease expense is recorded on a straight-line basis over the lease term. For finance leases, we amortize our right-of-use assets on a straight-line basis over the shorter of the asset’s useful life or the lease term. Additionally, interest expense is recognized each period related to the accretion of our lease liabilities over their respective lease terms. Refer to Note 2 for additional information related to practical expedients and elections made under ASC Topic 842. Stock-based compensation— Prior to the Separation, our employees participated in Dover’s stock-based compensation plans. Stock-based compensation was allocated to us by Dover based on the awards and terms previously granted to our employees. The cost of stock-based awards is measured at the grant date and are based on the fair value of the award. The value of the portion of the award that is expected to ultimately vest is recognized as expense on a straight-line basis, generally over the explicit service period and is included in selling, general and administrative expense in our consolidated statements of income. Forfeitures are accounted for as they occur. Expense for awards granted to retirement-eligible employees is recorded over the period from the date of grant through the date the employee first becomes eligible to retire and is no longer required to provide service. Employee benefit plans— Prior to the Separation, Apergy participated in defined benefit plans and non-qualified supplemental retirement plans sponsored by Dover that were accounted for as multi-employer plans in the consolidated financial statements. Apergy also sponsored a defined benefit plan and non-qualified plan during the pre-Separation period. These plans were accounted for as single employer plans in the consolidated financial statements. Research and development costs— Research and development costs are expensed as incurred and amounted to $12.9 million , $16.0 million and $18.5 million for the years ended December 31, 2019, 2018 and 2017, respectively. Income Taxes— Prior to the Separation, our operations were historically included in Dover’s consolidated federal tax return and certain combined state returns. The income tax expense in our consolidated financial statements for these pre-Separation periods was determined on a stand-alone return basis which requires the recognition of income taxes using the liability method. Under this method, we assume to have historically filed a return separate from Dover, reporting our taxable income or loss and paying applicable tax based on our separate taxable income and associated tax attributes in each tax jurisdiction. Income taxes payable prior to Separation, computed under the stand-alone return basis, were classified in “Net parent investment in Apergy” on our consolidated balance sheet since Dover is legally liable for the tax. Accordingly, changes in income taxes payable for periods prior to the Separation are presented as a component of financing activities in the statement of cash flows. The calculation of income taxes on the separate return basis requires considerable judgment and the use of both estimates and allocations. As a result, our effective tax rate and deferred tax balances will significantly differ from those in the periods prior to the Separation. The Tax Reform Act, enacted on December 22, 2017, significantly changed U.S. tax law by, among other things, lowering corporate income tax rates, implementing a territorial tax system and imposing a repatriation tax on deemed repatriated earnings of foreign subsidiaries. The Tax Reform Act reduced the U.S. corporate income tax rate from a maximum of 35% to a flat 21% rate, effective January 1, 2018. The Tax Reform Act also provided for a one-time deemed repatriation of post-1986 undistributed foreign subsidiary earnings and profits through the year ended December 31, 2017. The Global Intangible Low-Taxed Income (“GILTI”) provisions require us to include in our U.S. income tax return foreign subsidiary earnings in excess of an allowable return on the foreign subsidiary’s tangible assets. We have elected to account for GILTI tax in the period in which it is incurred. Deferred tax assets and liabilities are measured using the tax rates that are expected to apply to taxable income for the years in which those tax assets and liabilities are expected to be realized or settled. We record valuation allowances related to our deferred tax assets when we determine it is more likely than not the benefits will not be realized. Interest and penalties related to unrecognized tax benefits are recorded as a component of our provision for income taxes. We do not provide deferred taxes on undistributed earnings of our foreign subsidiaries as it is management’s intention to permanently reinvest these earnings to support the expansion of our international operations. If we were to make distributions from the subsidiaries, we would be subject to withholding tax on the remittances in various jurisdictions. Earnings per share (“EPS”)— Basic EPS is computed using the weighted-average number of common shares outstanding during the year. We use the treasury stock method to compute diluted EPS which gives effect to the potential dilution of earnings that could have occurred if additional shares were issued for awards granted under our incentive compensation and stock plan. The treasury stock method assumes proceeds that would be obtained upon exercise of awards granted under our incentive compensation and stock plan are used to purchase outstanding common stock at the average market price during the period. Fair value measurements— We record our financial assets and financial liabilities at fair value. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the reporting date. The fair value framework requires the categorization of assets and liabilities into three levels based upon the assumptions (inputs) used to price the assets or liabilities, with the exception of certain assets and liabilities measured using the net asset value practical expedient, which are not required to be leveled. Level 1 provides the most reliable measure of fair value, whereas Level 3 generally requires significant management judgment. The three levels are defined as follows: • Level 1: Unadjusted quoted prices in active markets for identical assets and liabilities. • Level 2: Observable inputs other than quoted prices included in Level 1. For example, quoted prices for similar assets or liabilities in active markets or quoted prices for identical assets or liabilities in inactive markets. • Level 3: Unobservable inputs reflecting management’s own assumptions about the assumptions market participants would use in pricing the asset or liability. Derivative financial instruments— Prior to the Separation, we used derivative financial instruments to hedge our exposure to foreign currency exchange rate risk. For derivatives hedging the fair value of assets or liabilities, the changes in fair value of both the derivatives and the hedged items are recorded in earnings. We do not enter into derivative financial instruments for speculative purposes. Foreign currency— Financial statements of operations for which the U.S. dollar is not the functional currency, and are located in non-highly inflationary countries, are translated into U.S. dollars prior to consolidation. Assets and liabilities are translated at the exchange rate in effect at the balance sheet date, while income statement accounts are translated at the weighted-average monthly exchange rates. For these operations, translation gains and losses are recorded as a component of accumulated other comprehensive income (loss) in stockholders’ equity until the foreign entity is sold or liquidated. Assets and liabilities of an entity that are denominated in currencies other than an entity’s functional currency are remeasured into the functional currency using end of period exchange rates or historical rates when applicable to certain balances. Gains and losses related to these re-measurements are recorded in our consolidated statements of income as a component of “Other expense, net”. Change in accounting estimate— Effective January 1, 2019, we changed our estimate of the useful lives for surface equipment used within our leased asset program in our Production & Automation Technologies segment to better reflect the estimated periods in which the assets will remain in service. The estimated useful lives of the equipment, previously estimated at three years , was increased to five years . The effect of this change in estimate for the year ended December 31, 2019 , was a reduction in depreciation expense of $8.8 million , an increase in net income of $6.7 million , and an increase in basic and diluted earnings per share of $0.09 per share. Reclassifications— Certain prior-year amounts have been reclassified to conform to the current year presentation. Revisions— We revised our previously issued financial statements for the years ended December 31, 2018 and December 31, 2017, to correct immaterial errors related to: (i) the assessing and recording of liabilities for state sales tax and associated penalties and interest, primarily resulting in an understatement of our selling, general, and administrative expense and interest expense of $3.1 million and $2.0 million for the years ended December 31, 2018 and 2017, respectively, and (ii) previously recorded amounts including, but not limited to, the write-off of inventory and leased assets, timing of revenue recognition, and revenue classification, that the Company concluded were immaterial to our previously filed consolidated financial statements. See the following tables for the impact of the corrections on the consolidated financial statements: Year Ended December 31, 2018 (in thousands, except per share data) As Reported Adjustments As Revised Product revenue $ 1,085,471 $ 4,747 $ 1,090,218 Other revenue (1) 131,175 (3,237 ) 127,938 Total revenue 1,216,646 1,510 1,218,156 Cost of goods and services 800,347 805 801,152 Gross profit 416,299 705 417,004 Selling, general and administrative expense 262,625 2,322 264,947 Interest expense, net 27,440 208 27,648 Other expense, net 2,943 113 3,056 Income before income taxes 123,291 (1,938 ) 121,353 Provision for income taxes 28,796 (634 ) 28,162 Net income 94,495 (1,304 ) 93,191 Net income attributable to noncontrolling interest 454 — 454 Net income attributable to Apergy $ 94,041 $ (1,304 ) $ 92,737 Earnings per share attributable to Apergy: Basic $ 1.22 $ (0.02 ) $ 1.20 Diluted $ 1.21 $ (0.02 ) $ 1.19 Comprehensive income $ 81,741 $ (1,304 ) $ 80,437 Comprehensive income attributable to Apergy $ 81,287 $ (1,304 ) $ 79,983 _______________________ (1) Includes “Service revenue” and “Lease and other revenue” as reported in the consolidated statement of income for the year ended December 31, 2018. Year Ended December 31, 2017 (in thousands, except per share data) As Reported Adjustments As Revised Product revenue $ 919,669 $ 3,023 $ 922,692 Other revenue (1) 90,797 (3,023 ) 87,774 Total revenue 1,010,466 — 1,010,466 Cost of goods and services 689,990 408 690,398 Gross profit 320,476 (408 ) 320,068 Selling, general and administrative expense 218,558 2,849 221,407 Interest expense, net 753 110 863 Other expense, net 10,377 (934 ) 9,443 Income before income taxes 90,788 (2,433 ) 88,355 Benefit from income taxes (21,876 ) (288 ) (22,164 ) Net income 112,664 (2,145 ) 110,519 Net income attributable to noncontrolling interest 930 — 930 Net income attributable to Apergy $ 111,734 $ (2,145 ) $ 109,589 Earnings per share attributable to Apergy: Basic $ 1.44 $ (0.02 ) $ 1.42 Diluted $ 1.43 $ (0.02 ) $ 1.41 Comprehensive income $ 119,905 $ (2,145 ) $ 117,760 Comprehensive income attributable to Apergy $ 118,975 $ (2,145 ) $ 116,830 _______________________ (1) Includes “Service revenue” and “Lease and other revenue” as reported in the consolidated statement of income for the year ended December 31, 2017. December 31, 2018 (in thousands) As Reported Adjustments As Revised Assets Receivables, net $ 249,948 $ 1,488 $ 251,436 Inventories, net 218,319 1,102 219,421 Prepaid expenses and other current assets 20,211 (1,677 ) 18,534 Total current assets 530,310 913 531,223 Other non-current assets 8,445 447 8,892 Total assets 1,971,756 1,360 1,973,116 Liabilities and Equity Accounts payable 131,058 9,067 140,125 Current portion of finance lease liabilities (1) — 4,320 4,320 Accrued expenses and other current liabilities (1) 30,391 (1,630 ) 28,761 Total current liabilities 201,995 11,757 213,752 Long-term debt 666,108 (2,901 ) 663,207 Deferred income taxes 101,724 (1,952 ) 99,772 Total liabilities 990,229 6,904 997,133 Stockholders’ equity: Capital in excess of par value of common stock 965,372 (4,599 ) 960,773 Retained earnings 55,829 (945 ) 54,884 Total stockholders’ equity 979,069 (5,544 ) 973,525 Total equity 981,527 (5,544 ) 975,983 Total liabilities and equity $ 1,971,756 $ 1,360 $ 1,973,116 _______________________ (1) “Current portion of finance lease liabilities” has been reclassified to a separate line consistent with the consolidated balance sheet as of December 31, 2019. (in thousands) As Reported Adjustments As Revised Total equity at December 31, 2016 $ 1,551,218 $ (2,714 ) $ 1,548,504 Net income 112,664 (2,145 ) 110,519 Net transfers to Dover (29,526 ) (17 ) (29,543 ) Total equity at December 31, 2017 1,640,385 (4,876 ) 1,635,509 Net income 94,495 (1,304 ) 93,191 Net transfers to/from Dover (742,690 ) 636 (742,054 ) Total equity at December 31, 2018 $ 981,527 $ (5,544 ) $ 975,983

New Accounting Standards

New Accounting Standards	12 Months Ended
	Dec. 31, 2019
Accounting Changes and Error Corrections [Abstract]
New Accounting Standards	NEW ACCOUNTING STANDARDS Recently Adopted Accounting Standards Effective January 1, 2019, we adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2016-02, “ Leases (Topic 842). ” This update requires a lessee to recognize in the statement of financial position a right-of-use asset representing its right to use the underlying asset for the lease term and a liability for future lease payments. Similar to past guidance, the update continues to differentiate between finance leases and operating leases; however, this distinction now primarily relates to differences in the manner of expense recognition over time. Additionally, lessors will be required to classify leases as sales-type, finance or operating, with classification affecting the pattern of income recognition. Classification for both lessees and lessors is now based on an assessment of whether a lease contract is economically similar to the purchase of a non-financial asset from the perspective of control. The update also requires quantitative and qualitative disclosures to enable users to understand the amount, timing, and judgments related to leases and the related cash flows. We applied the provisions of this ASU to our lease contracts as of January 1, 2019, using the modified retrospective method of adoption. Prior period amounts have not been adjusted and continue to be reflected in accordance with our historical accounting policies. As of January 1, 2019, we recorded operating lease right-of-use assets of $27.0 million and operating lease liabilities of $27.0 million as a result of the adoption of this guidance. We have applied the following practical expedients and elections under the new standard: • We elected to utilize the package of transition practical expedients, which permitted us (i) to not reassess whether any expired or existing contracts are or contain a lease, (ii) to not reassess our historical lease classifications for existing leases, and (iii) to not reassess initial direct costs for existing leases. • For contracts in which we are a lessee, we have elected for each of our asset classes to account for each lease component and its associated non-lease components as a single lease component. • We elected to utilize the short term lease exemption for lease contracts with a term of less than 12 months. These contracts are excluded from the measurement of our right-of-use assets and lease liabilities and are recognized in earnings on a straight-line basis over their lease term. • We elected to utilize the practical expedient to exclude sales tax from the measurement of lease revenue. See Note 14—Leases for additional information related to our lease accounting. See Note 22—Cash Flow Information for additional information regarding the presentation of our leases within our consolidated statements of cash flows. Effective July 1, 2019, we adopted ASU 2018-15, “ Intangibles—Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. ” The amendments in this update align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The accounting for the service element of a hosting arrangement that is a service contract is not affected by the amendments in this update. The amendments in this update have been applied prospectively to all implementation costs incurred after the date of adoption. The impact of adopting the new standard was not material to our financial statements for the year ended December 31, 2019 . Effective December 31, 2019 we adopted ASU 2018-14, “ Compensation—Retirement Benefits—Defined Benefit Plans—General (Subtopic 715-20): Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans.” The amendment modifies certain disclosure requirements for defined benefit plans. Among other requirements and modifications, the amendment requires an explanation of the reasons for significant gains and losses related to changes in the benefit obligation for the period. The impact of adopting the new standard was not material to our financial statements for the year ended December 31, 2019 . Recently Issued Accounting Standards In June 2016, the FASB issued ASU 2016-13, “ Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments .” The update amends the impairment model to utilize an expected loss methodology in place of the currently used incurred loss methodology, which may result in earlier recognition of losses related to financial instruments. The guidance will be effective for us on January 1, 2020. We are currently evaluating the impact of this guidance and are in the process of: • collecting historical data that will be used in the calculation of expected credit losses; • documenting relevant assumptions to calculate expected losses; and • updating policies, procedures and internal controls.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2019
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS Dover Corporation Prior to the Separation, Dover provided certain services to us, including corporate executive management, human resources, information technology, facilities, tax, shared services, finance and legal services. Dover continued to provide us certain of these services on a temporary basis following the Separation under a transition services agreement. Under the transition services agreement, Apergy paid a fee to Dover for services under the transition services agreement, which fee was intended to allow Dover to recover all of its direct and indirect costs generally without profit. The transition services agreement was terminated on January 31, 2019, consistent with the initial term provided within the agreement. Financial information presented prior to the Separation does not include all the expenses that would have been incurred had Apergy been a stand-alone public company. The corporate expenses allocated by Dover to these financial statements were $7.4 million and $23.0 million for the years ended December 31, 2018 and 2017, respectively, which were recorded in “Selling, general and administrative expense” in the consolidated statements of income. For periods prior to the Separation, transactions between Apergy and Dover, with the exception of transactions discussed below with Dover’s affiliates, are reflected in “Distributions to Dover Corporation, net” in the consolidated statements of cash flows for the years ended December 31, 2018, and 2017, as a financing activity. Revenue with Dover and its affiliates were not material for the periods presented. We recognized royalty expense of $2.3 million and $9.8 million for the years ended December 31, 2018, and 2017, respectively, related to the use of Dover’s intellectual property and patents which are included in “Other expense, net” in the consolidated statements of income. On April 1, 2018, patents and other intangibles owned by Dover related to our operations transferred to Apergy, and consequently, Apergy no longer incurred royalty charges related to these assets from Dover. Noncontrolling Interest For the years ended December 31, 2018 , and 2017 , we declared and paid $2.7 million and $1.2 million , respectively, of distributions to the noncontrolling interest holder in Apergy Middle East Services LLC, a subsidiary in the Sultanate of Oman. We have a commission arrangement with our noncontrolling interest for 5% of certain annual product sales.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE On May 9, 2018, 77,339,828 shares of our common stock were distributed to Dover stockholders in conjunction with the Separation. See Note 1—Basis of Presentation and Summary of Significant Accounting Policies for additional information. For comparative purposes, and to provide a more meaningful calculation of weighted-average shares outstanding, we have assumed the shares issued in conjunction with the Separation to be outstanding as of the beginning of each period prior to the Separation. In addition, we have assumed the potential dilutive securities outstanding as of May 8, 2018, were outstanding and fully dilutive in each of the periods with positive income prior to the Separation. A reconciliation of the number of shares used for the basic and diluted earnings per share calculation was as follows: Years Ended December 31, (in thousands, except per share data) 2019 2018 2017 Net income attributable to Apergy $ 52,164 $ 92,737 $ 109,589 Weighted-average number of shares outstanding 77,427 77,342 77,340 Dilutive effect of stock-based compensation 197 350 550 Total shares and dilutive securities 77,624 77,692 77,890 Basic earnings per share attributable to Apergy $ 0.67 $ 1.20 $ 1.42 Diluted earnings per share attributable to Apergy $ 0.67 $ 1.19 $ 1.41

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2019
Business Combinations [Abstract]
Acquisitions	ACQUISITIONS On July 31, 2019, Apergy entered into an asset purchase agreement to acquire certain assets, which meet the definition of a business, used in the manufacturing of downhole monitoring systems. The acquisition is included among the consolidated subsidiaries reported in our Production & Automation Technologies segment and provides digital technology strategic to our artificial lift product offering. The acquisition-date fair value of the consideration transferred consisted of the following: (in thousands) Cash $ 12,500 Contingent consideration (1) 1,500 Total consideration transferred $ 14,000 _______________________ (1) Contingent consideration is payable to the seller based on the acquired business exceeding a revenue target over an eighteen month period ending January 2021. Achievement of the revenue target is considered probable. The following table summarizes the final fair values of the assets acquired at the acquisition date: (in thousands) Inventory $ 1,840 Customer relationships 2,650 Technology - Technical know-how 4,000 Goodwill 5,510 Total assets acquired $ 14,000 The amortization period is 15 years for acquired customer relationships and technology. The goodwill recognized as a result of the acquisition is tax deductible and primarily reflects the expected benefits to be derived from operational synergies. In October 2017, Apergy acquired 100% of the voting stock of PCP Oil Tools S.A. and Ener Tools S.A. (“PCP Tools”), a supplier of progressive cavity pump products and services for total consideration of $8.8 million , net of cash acquired. This acquisition is a part of our Production & Automation Technologies segment and broadens our ability to supply customers in Argentina. We recorded non-deductible goodwill of $5.1 million , customer intangible assets of $4.5 million , and net working capital that is not material to the consolidated financial statements. The goodwill recorded as a result of the acquisition reflects the benefits expected to be derived from product line expansion and operational synergies. The intangible assets acquired are being amortized over nine years . Results of operations of the acquired businesses have been included in our consolidated financial statements from their acquisition dates. Pro forma results of operations have not been presented as the effects of the acquisitions are not material to our consolidated financial statements.

Dispositions

Dispositions	12 Months Ended
	Dec. 31, 2019
Dispositions [Abstract]
Dispositions	DISPOSITIONS During March 2019, we classified our pressure vessel manufacturing business in our Production & Automated Technologies segment as held for sale. We recognized an impairment loss of $1.7 million , which was recorded in “Selling, general and administrative expense” in the consolidated statements of income, to adjust the carrying amount of the disposal group to fair value. See Note 19—Fair Value Measurements for additional information. In June 2019, we completed the sale of our pressure vessel manufacturing business and made a cash payment of $2.2 million , resulting in a loss on disposition of $2.5 million , which was recorded in “Other expense, net” in the consolidated statements of income for the year ended December 31, 2019.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2019
Inventory Disclosure [Abstract]
Inventories	INVENTORIES Inventories consisted of the following: (in thousands) December 31, 2019 December 31, 2018 Raw materials $ 50,099 $ 53,677 Work in progress 13,325 11,416 Finished goods 175,774 180,106 239,198 245,199 LIFO and valuation adjustments (27,856 ) (25,778 ) Inventories, net $ 211,342 $ 219,421 As of December 31, 2019 and 2018 , approximately 23% and 24% , respectively, of our total net inventories were accounted for using the LIFO method. The current replacement costs of LIFO inventories exceeded their carrying value by approximately $15.8 million and $12.9 million at December 31, 2019 and 2018 , respectively. There were no reductions to the base LIFO inventories in 2019 or 2018 .

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment consisted of the following: (in thousands) December 31, 2019 December 31, 2018 Land $ 13,498 $ 13,607 Buildings and improvements 107,914 105,036 Software 15,323 14,553 Machinery, equipment and other 538,168 503,476 674,903 636,672 Accumulated depreciation (426,722 ) (392,344 ) Property, plant and equipment, net $ 248,181 $ 244,328 Depreciation expense was $68.6 million , $72.6 million and $59.2 million for the years ended December 31, 2019 , 2018 , and 2017 , respectively.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	GOODWILL AND INTANGIBLE ASSETS Goodwill The carrying amount, including changes therein, of goodwill by reporting segment was as follows: (in thousands) Production & Automation Technologies Drilling Technologies Total December 31, 2017 $ 808,952 $ 101,136 $ 910,088 Purchase price adjustment (1) (53 ) — (53 ) Foreign currency translation (5,050 ) — (5,050 ) December 31, 2018 803,849 101,136 904,985 Acquisitions 5,510 — 5,510 Foreign currency translation 618 — 618 December 31, 2019 $ 809,977 $ 101,136 $ 911,113 _______________________ (1) Purchase price adjustment related to our 2017 acquisition of PCP Oil Tools S.A. and Ener Tools S.A. We recorded $5.5 million of acquired goodwill in 2019. See Note 5—Acquisitions for additional information. We did not recognize any impairment for the years ended December 31, 2019 and 2018 , as the fair values of our reporting units exceeded their carrying amounts. Intangible Assets The components of our definite- and indefinite-lived intangible assets were as follows: December 31, 2019 December 31, 2018 (in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Definite-lived intangible assets: Customer intangibles $ 560,316 $ 353,189 $ 207,127 $ 568,643 $ 319,827 $ 248,816 Trademarks 35,695 24,830 10,865 36,296 21,575 14,721 Patents 38,436 26,838 11,598 38,141 23,568 14,573 Unpatented technologies 13,700 9,811 3,889 9,700 9,700 — Drawings and manuals 2,558 1,758 800 3,000 2,142 858 Other 5,332 4,504 828 5,268 4,148 1,120 656,037 420,930 235,107 661,048 380,960 280,088 Indefinite-lived intangible assets: Trademarks 3,600 — 3,600 3,600 — 3,600 Total $ 659,637 $ 420,930 $ 238,707 $ 664,648 $ 380,960 $ 283,688 We recorded $6.7 million of acquired intangible assets in 2019. See Note 5—Acquisitions for additional information. Additional changes to the gross carrying amount of intangible assets during the year ended December 31, 2019 were the result of foreign currency translation adjustments. Amortization expense related to our intangible assets was $51.4 million , $51.9 million and $53.7 million for the years ended December 31, 2019 , 2018 and 2017 , respectively. Estimated future amortization expense related to intangible assets held as of December 31, 2019 , is as follows: (in thousands) Estimated Amortization 2020 $ 50,147 2021 49,319 2022 47,820 2023 33,928 2024 23,271

Debt

Debt	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Debt	DEBT Long-term debt consisted of the following: (in thousands) December 31, 2019 December 31, 2018 Revolving credit facility $ — $ — Term loan facility 265,000 370,000 6.375% Senior Notes due 2026 300,000 300,000 Finance lease obligations 4,530 4,584 Total 569,530 674,584 Net unamortized discounts and issuance costs (9,709 ) (11,377 ) Total long-term debt $ 559,821 $ 663,207 Senior Notes On May 3, 2018, and in connection with the Separation, we completed the offering of $300.0 million in aggregate principal amount of 6.375% senior notes due May 2026 (“Senior Notes”). Interest on the Senior Notes is payable semi-annually in arrears on May 1 and November 1 of each year, commencing on November 1, 2018. Net proceeds of $293.8 million from the offering were utilized to partially fund the $700.0 million cash payment to Dover at the Separation and to pay fees and expenses incurred in connection with the Separation. The terms of the Senior Notes are governed by the indenture dated as of May 3, 2018, between Apergy and Wells Fargo Bank, N.A., as trustee, and are guaranteed, on a senior unsecured basis, by the subsidiary guarantors of our senior secured credit facilities as described below. At any time prior to May 1, 2021, we may redeem all or part of the Senior Notes at a redemption price equal to 100% of the principal amount of the Senior Notes redeemed plus a premium, as defined in the indenture, plus accrued and unpaid interest. Beginning on or after May 1, 2021, we may redeem the Senior Notes, in whole or in part, at certain tiered redemption prices as defined in the indenture, plus accrued and unpaid interest. The Senior Notes are our senior unsecured obligations. The Senior Notes rank equally in right of payment with our future and existing senior debt but are effectively subordinated to our future and existing debt to the extent of the assets securing such senior debt. The Senior Notes rank senior in right of payment to all of our future subordinated debt. Senior Secured Credit Facilities On May 9, 2018, we entered into a credit agreement (“credit agreement”) governing the terms of our senior secured credit facilities, consisting of (i) a 7 -year senior secured term loan B facility (“term loan facility”) and (ii) a 5 -year senior secured revolving credit facility (“revolving credit facility,” and together with the term loan facility, the “senior secured credit facilities”), with JPMorgan Chase Bank, N.A. as administrative agent. The net proceeds of the senior secured credit facilities were used (i) to pay fees and expenses in connection with the Separation, (ii) partially fund the cash payment to Dover and (iii) provide for working capital and other general corporate purposes. The senior secured credit facilities are jointly and severally guaranteed by Apergy and certain of Apergy’s wholly owned U.S. subsidiaries (“guarantors”), on a senior secured basis, and are secured by substantially all tangible and intangible assets of Apergy and the guarantors, except for certain excluded assets. At our election, outstanding borrowings under the senior secured credit facilities will accrue interest at a per annum rate of (i) LIBOR plus a margin or (ii) a base rate plus a margin. Interest on borrowings in which interest is accrued based on LIBOR plus an applicable margin is payable in three month increments. Interest on borrowings in which interest is accrued at a base rate plus an applicable margin is payable on the last business day of each quarter. The senior secured credit facilities contain a number of customary covenants that, among other things, limit or restrict the ability of Apergy and the restricted subsidiaries to, subject to certain qualifications and exceptions, perform certain activities which include, but are not limited to (i) incur additional indebtedness, (ii) make acquisitions and (iii) pay dividends or other payments in respect of our capital stock. Additionally, Apergy is required to maintain (a) a minimum interest coverage ratio, as defined in the credit agreement, of 2.75 to 1.00 and (b) a maximum total leverage ratio, as defined in the credit agreement, of 4.00 to 1.00 through the fiscal quarter ending June 30, 2019, then 3.75 to 1.00 through the fiscal quarter ending June 30, 2020, then 3.50 to 1.00 thereafter. Term Loan Facility. The term loan facility had an initial commitment of $415.0 million . The full amount of the term loan facility was funded on May 9, 2018. Amounts borrowed under the term loan facility that are repaid or prepaid may not be re-borrowed. The term loan facility matures in May 2025. Net proceeds of $408.7 million from the term loan facility were utilized to partially fund the cash payment to Dover at the Separation and to pay fees and expenses incurred in connection with the Separation. The term loan is subject to mandatory amortization payments of 1% per annum of the initial commitment of $415.0 million paid quarterly. Additionally, subject to certain exceptions, the term loan facility is subject to mandatory prepayments, including the amount equal to: 100% of the net cash proceeds of all non-ordinary course asset sales subject to (i) reinvestment periods and (ii) step-downs to 75% and 50% based on certain leverage targets; and 50% of excess cash flow, as defined in the credit agreement, with step-downs to 25% and 0% based on certain leverage targets. Apergy may voluntarily prepay amounts outstanding under the term loan facility in whole or in part at any time without premium or penalty, as defined in the credit agreement. Revolving Credit Facility. The revolving credit facility consists of a 5 -year senior secured facility with aggregate commitments in an amount equal to $250.0 million , of which up to $50.0 million is available for the issuance of letters of credit. Amounts repaid under the revolving credit facility may be re-borrowed. The revolving credit facility matures in May 2023 . As of December 31, 2019 , aggregate contractual future principal payments on long-term debt are as follows: (in thousands) Principal Payments ( 1) 2020 $ — 2021 — 2022 — 2023 — 2024 — Thereafter 565,000 Total $ 565,000 _______________________ (1) Principal payments included relate to our term loan facility and senior notes. See Note 14—Leases for future payments related to finance lease obligations.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENT AND CONTINGENCIES Lease Commitments See Note 14—Leases for a schedule of future minimum payments on our operating and finance lease arrangements. Guarantees and Indemnifications We have provided indemnities in connection with sales of certain businesses and assets, including representations and warranties, covenants and related indemnities for environmental health and safety, tax and employment matters. We do not have any material liabilities recorded for these indemnifications and are not aware of any claims or other information that would give rise to material payments under such indemnities. In connection with the Separation, we entered into agreements with Dover that govern the treatment between Dover and us for certain indemnification matters and litigation responsibility. Generally, the separation and distribution agreement provides for cross-indemnities principally designed to place financial responsibility for the obligations and liabilities of our business with us and to place financial responsibility for the obligations and liabilities of Dover’s business with Dover. The separation and distribution agreement also establishes procedures for handling claims subject to indemnification and related matters. In addition, pursuant to the tax matters agreement, we have agreed to indemnify Dover and its affiliates against any and all tax-related liabilities incurred by them relating to the Separation and/or certain related transactions to the extent caused by an acquisition of Apergy stock or assets or by any other action or failure to act undertaken by Apergy or its affiliates. During the year ended December 31, 2019 , and pursuant to the provisions of the tax matters agreement with Dover, we recognized $3.4 million of indemnification expense within “Selling, general and administrative expense” in the consolidated statements of income with respect to certain liabilities related to tax audits for the 2012-2016 tax years. We received notification in February 2020 that the tax audits and related assessments have been completed. The difference between the indemnification liability recorded at December 31, 2019 and the final settlement amount is not material to our consolidated financial statements. As of December 31, 2019 and 2018 , we had $15.7 million and $3.6 million , respectively, of outstanding letters of credit, surety bonds and guarantees which expire at various dates through 2026. These financial instruments are primarily maintained as security for insurance, warranty and other performance obligations. Generally, we would only be liable for the amount of these letters of credit and surety bonds in the event of default in the performance of our obligations, the probability of which we believe is remote. Litigation and Environmental Matters We are involved in various pending or potential legal actions in the ordinary course of our business. These proceedings primarily involve claims by private parties alleging injury arising out of use of our products, patent infringement, employment matters, and commercial disputes. We review the probable outcome of such proceedings, the costs and expenses reasonably expected to be incurred and accrued to-date, and the availability and extent of insurance coverage. We accrue a liability for legal matters that are probable and estimable, and as of December 31, 2019 and December 31, 2018 , these liabilities were not material. Management is unable to predict the ultimate outcome of these actions because of the inherent uncertainty of litigation. However, management believes the most probable, ultimate resolution of these matters will not have a material adverse effect on our consolidated financial position, results of operations or cash flows. Prior to the Separation, groundwater contamination was discovered at the Norris Sucker Rods plant site located in Tulsa, Oklahoma ("Norris"). Initial remedial efforts were undertaken at the time of discovery of the contamination and Norris has since coordinated monitoring and remediation with the Oklahoma Department of Environmental Quality ("ODEQ"). As part of the ongoing long-term remediation process, Norris contracted an engineering and consulting firm to develop a range of possible additional remedial alternatives in order to accelerate the remediation process and associated cost estimates for the work. In October 2019, we received the firm’s preliminary remedial alternatives for consideration. Now that we have such recommendations, we expect to begin discussions with ODEQ regarding our proposed long-term remediation plan. The plan is subject to ODEQ’s review, input, and approval. Because we have not yet finalized a plan for further remediation at the site and discussions with ODEQ remain ongoing, we cannot fully anticipate the timing, outcome or possible impact of such further remedial activities, financial or otherwise. At December 31, 2019 , as a result of the recommendations in the report, we have accrued liabilities for these remediation efforts of approximately $2.0 million with such charges recorded within “Selling, general and administrative expense” in the consolidated statements of income. Liabilities could increase in the future at such time as we ultimately reach agreement with ODEQ on our remediation plan and such liabilities become probable and can be reasonably estimated.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Stockholders' Equity	STOCKHOLDERS' EQUITY Capital stock —The following is a summary of our capital stock activity: (in thousands) Common Stock December 31, 2017 — Issuance of common stock at the Separation 77,340 Shares issued—share-based compensation 13 December 31, 2018 77,353 Shares issued—share-based compensation 107 December 31, 2019 77,460 We have 250 million shares of preferred stock authorized, with a par value of $0.01 per share. No shares of preferred stock were outstanding as of December 31, 2019, 2018 or 2017. Accumulated other comprehensive loss —Accumulated other comprehensive loss consisted of the following: (in thousands) Foreign Currency Translation Defined Pension and Other Post-Retirement Benefits Accumulated Other Comprehensive Loss December 31, 2017 $ (21,936 ) $ (4,480 ) $ (26,416 ) Reclassification adjustment for cumulative effect of change in accounting principle — (1,315 ) (1,315 ) Net transfer from Dover — (2,421 ) (2,421 ) Other comprehensive income (loss) before reclassifications, net of tax (14,210 ) 856 (13,354 ) Reclassification adjustment for net losses included in net income, net of tax — 600 600 Other comprehensive income (loss), net of tax (14,210 ) 1,456 (12,754 ) December 31, 2018 (36,146 ) (6,760 ) (42,906 ) Other comprehensive income (loss) before reclassifications, net of tax 936 (2,711 ) (1,775 ) Reclassification adjustment for net losses included in net income, net of tax — 644 644 Other comprehensive income (loss), net of tax 936 (2,067 ) (1,131 ) December 31, 2019 $ (35,210 ) $ (8,827 ) $ (44,037 ) Reclassifications from accumulated comprehensive loss —Reclassification adjustments from accumulated other comprehensive loss to net income related to defined pension and other post-retirement benefits consisted of the following: Years Ended December 31, Affected line items on the consolidated statements of income (in thousands) 2019 2018 2017 Amortization of actuarial loss and net transition obligation (1) $ 364 $ 330 $ 397 Other expense, net Amortization of prior service cost (1) 2 1 2 Other expense, net Settlement loss (1) 508 479 — Other expense, net 874 810 399 Income before income taxes (230 ) (210 ) (141 ) Provision for (benefit from) income taxes $ 644 $ 600 $ 258 Net income _______________________ (1) These accumulated comprehensive loss components are included in the computation of net periodic benefit cost (See Note 17—Employee Benefit Plans for additional information).

Revenue

Revenue	12 Months Ended
	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue	REVENUE Our revenue is substantially generated from product sales derived from the sale of drilling and production equipment. Service revenue is earned as technical advisory assistance and field services related to our products are provided. Lease revenue is derived from rental income of leased production equipment and is recognized ratably over the lease term. The majority of our revenue is short cycle in nature, with shipments occurring within a year from the customer order date. A small portion of our revenue is derived from contracts extending over one year. Our payment terms generally range between 30 to 90 days and vary by the location of our businesses and the types and volumes of products manufactured and sold, among other factors. Costs incurred to obtain a customer contract are not material to us. Disaggregation of Revenue Revenue disaggregated by revenue type was as follows: Years Ended December 31, (in thousands) 2019 2018 2017 (1) Product revenue $ 1,000,630 $ 1,090,218 $ 922,692 Service revenue 82,021 83,334 63,386 Lease and other revenue 48,600 44,604 24,388 Total revenue $ 1,131,251 $ 1,218,156 $ 1,010,466 Revenue disaggregated by end market in each of our reportable segments was as follows: Years Ended December 31, (in thousands) 2019 2018 2017 (1) Drilling Technologies $ 246,887 $ 285,565 $ 227,653 Production & Automation Technologies: Artificial lift 687,607 725,584 602,287 Digital products 134,660 119,293 82,093 Other production equipment 63,117 88,754 103,564 Intra-segment eliminations (1,020 ) (1,040 ) (5,131 ) 884,364 932,591 782,813 Total revenue $ 1,131,251 $ 1,218,156 $ 1,010,466 Revenue disaggregated by geography was as follows: Years Ended December 31, (in thousands) 2019 2018 2017 (1) United States $ 861,001 $ 959,167 $ 770,843 Canada 70,314 79,816 79,186 Middle East 60,064 53,516 48,899 Europe 51,965 38,669 28,112 Latin America 32,408 33,976 34,350 Australia 30,841 33,247 23,667 Asia-Pacific and other 24,658 19,765 25,409 Total revenue $ 1,131,251 $ 1,218,156 $ 1,010,466 _______________________ (1) Revenue for the year ended December 31, 2017 is presented in accordance with accounting standards in effect prior to our adoption of ASU No. 2014-09 on January 1, 2018. Revenue is attributed to regions based on the location of our direct customer. Performance Obligations The majority of our contracts have a single performance obligation which represents, in most cases, the equipment or product sold to the customer. Some contracts include multiple performance obligations, often satisfied at or near the same time, such as a product and the related installation, extended warranty and/or maintenance services. For contracts with multiple performance obligations, we allocate the transaction price to each performance obligation based on the estimated relative standalone selling prices of the promised goods or services underlying each performance obligation. We typically use observable prices to determine the stand-alone selling price of a performance obligation and utilize a cost plus margin approach when observable prices are not available. Substantially all of our performance obligations are recognized at a point in time and are primarily related to our product revenue derived from the sale of drilling and production equipment. Revenue is recognized when control transfers to the customer upon shipment or completion of installation, testing, or certification as required under the contract. Leased equipment damaged in operation is generally charged to the customer and recognized as product revenue. Revenue is recognized over time for our service and lease offerings. Service revenue is recognized over time as we provide technical advisory assistance and field services related to our products. Warranties The majority of our contracts contain standard warranties in connection with the sale of a product to a customer which provide a customer assurance that the related product will function for a period of time as the parties intended. In addition to our standard warranties, we also offer extended warranties to our customers. Warranties that represent a distinct service are recognized as service revenue over the related warranty period. Remaining performance obligations As of December 31, 2019 , we did not have any contracts with an original length of greater than a year from which revenue is expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied). Contract Balances The beginning and ending contract asset and contract liability balances from contracts with customers were as follows: (in thousands) December 31, 2019 December 31, 2018 January 1, 2018 Contract assets $ 285 $ 4,571 $ 4,733 Contract liabilities $ 6,148 $ 5,863 $ 3,912 Contract assets primarily relate to work completed for performance obligations that are satisfied over time and are recorded in “prepaid expenses and other current assets” on our consolidated balance sheets. Contract assets are transferred to receivables when the right to consideration becomes unconditional. Contract liabilities relate to our obligation to transfer goods or services to a customer for which we have received advance consideration (or an amount of consideration is due) from the customer. Current contract liabilities are recorded in other “accrued expenses and other current liabilities” on our consolidated balance sheets.

Leases

Leases	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Leases	LEASES Lessee Accounting We have operating and finance leases for real estate, vehicles and equipment. Certain of our vehicle leases include residual value guarantees, which have been excluded from the measurement of our lease liabilities as we do not believe it is probable the residual value guarantees will be paid at the end of the lease. Our real estate and vehicle leases generally include options to renew or extend the lease term at our discretion. These options are included in the measurement of our lease liabilities only when it is reasonably certain that we will exercise these rights. Balance sheet presentation —Leases are presented in our consolidated balance sheet as follows: (in thousands) Balance Sheet Classification December 31, 2019 Right-of Use Assets: Finance leases Property, plant, and equipment, net $ 9,406 Operating leases Other non-current assets 24,289 Total lease right-of-use assets 33,695 Lease Liabilities: Finance leases - current Current portion of finance lease liabilities 4,845 Finance leases Long-term debt 4,530 Operating leases - current Accrued expenses and other current liabilities 7,620 Operating leases Other long-term liabilities 19,419 Total lease liabilities $ 36,414 Components of total lease cost —Components of total lease cost were as follows: (in thousands) Year ended December 31, 2019 Finance lease cost: Amortization of right-of-use assets $ 5,200 Interest on lease liabilities 439 Operating lease cost (1) 11,191 Short-term lease cost 3,996 Variable lease cost 1,049 Sublease income (463 ) Total net lease cost $ 21,412 _______________________ (1) Rent expense, net of sublease rental income, for our operating leases was $16.8 million and $15.6 million for the years ended December 31, 2018, and 2017, respectively. Lease term and discount rate —Our weighted-average remaining lease term and weighted-average discount rate for operating and finance leases are as follows: December 31, 2019 Weighted-average remaining lease term (years): Operating lease 4.6 Finance lease 2.1 Weighted-average discount rate: Operating lease 6.7 % Finance lease 5.3 % Maturity Analysis —Future minimum payments, as determined in accordance with ASC 842, on our operating and finance leases as of December 31, 2019 are as follows: (in thousands) Operating Finance 2020 $ 9,096 $ 5,219 2021 5,939 3,488 2022 5,147 1,054 2023 4,456 155 2024 2,906 34 Thereafter 4,889 — Total future minimum lease payments 32,433 9,950 Interest included within lease payments (5,394 ) (575 ) Total lease liabilities $ 27,039 $ 9,375 Lessor Accounting Lease revenue is primarily generated from our electric submersible pump (“ESP”) leased asset program within our Production & Automation Technologies segment. An ESP rental unit has components consisting of surface, downhole and cable equipment. Our lease arrangements generally allow customers to rent equipment on a daily basis with no stated end date. Customers may return the equipment at any point subsequent to the lease commencement date without penalty. We account for these arrangements as a daily renewal option beginning on the lease commencement date, with the lease term determined as the period in which it is reasonably certain the option will be exercised. The average length of these arrangements generally range from six months to nine months . Lease revenue was $44.7 million for the year ended December 31, 2019 . Leased assets —Components of our leased asset program, all of which are included within “Property, plant, and equipment, net” on our consolidated balance sheet, are as follows: (in thousands) Useful life December 31, 2019 Cable equipment 1 year $ 52,144 Downhole equipment 1 year 32,193 Surface equipment 5 years 69,566 Other lease equipment 3 - 5 years 16,090 169,993 Accumulated depreciation (71,968 ) Leased assets, net $ 98,025 Depreciation expense on our leased assets was $37.1 million for the year ended December 31, 2019 .

Restructuring

Restructuring	12 Months Ended
	Dec. 31, 2019
Restructuring and Related Activities [Abstract]
Restructuring	RESTRUCTURING We initiated various restructuring programs and incurred severance and other restructuring costs by segment as follows: Years Ended December 31, (in thousands) 2019 2018 2017 Production & Automation Technologies $ 4,467 $ 5,632 $ 6,921 Drilling Technologies 710 — — Total $ 5,177 $ 5,632 $ 6,921 Cost of goods and services $ 3,592 $ 4,693 $ 6,332 Selling, general and administrative expense 1,585 939 589 Total $ 5,177 $ 5,632 $ 6,921 Restructuring charges incurred during years ended December 31, 2019 , 2018 , and 2017 , included the following programs, which were substantially completed during those three years: Production & Automation Technologies. Production & Automation Technologies incurred restructuring charges of $4.5 million , $5.6 million and $6.9 million during the years ended December 31, 2019 , 2018 and 2017 , respectively, related to various programs, primarily focused on facility closures and consolidations, exit of certain nonstrategic product lines, and workforce reductions. Drilling Technologies. Drilling Technologies recorded $0.7 million in restructuring charges during the year ended December 31, 2019 , related to various programs, primarily focused on workforce reductions to better align the cost base with the significantly lower demand environment.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES Prior to the Separation, the operations of Apergy were included in Dover’s U.S. combined federal and state income tax returns. Income tax expense and deferred tax balances are presented in these financial statements as if Apergy filed its own tax returns in each jurisdiction. These statements include tax losses and tax credits that may not reflect tax positions taken by Dover. In many cases, tax losses and tax credits generated by Apergy have been utilized by Dover. Components of income before income taxes —Domestic and foreign components of income before income taxes were as follows: Years Ended December 31, (in thousands) 2019 2018 2017 Domestic $ 51,073 $ 104,234 $ 65,923 Foreign 8,113 17,119 22,432 Income before income tax $ 59,186 $ 121,353 $ 88,355 Provision for (benefit from) income taxes —The provision for (benefit from) income taxes consisted of: Years Ended December 31, (in thousands) 2019 2018 2017 Current: U.S. federal $ 15,327 $ 24,221 $ 42,690 State and local 1,196 1,598 4,255 Foreign 4,264 4,362 6,127 Total current 20,787 30,181 53,072 Deferred: U.S. federal (12,815 ) (2,255 ) (73,544 ) State and local (1,156 ) 2,735 (1,595 ) Foreign (590 ) (2,499 ) (97 ) Total deferred (14,561 ) (2,019 ) (75,236 ) Provision for (benefit from) income taxes $ 6,226 $ 28,162 $ (22,164 ) Effective income tax rate reconciliation —The effective income tax rate was different from the statutory U.S. federal income tax rate due to the following: Years Ended December 31, 2019 2018 2017 Statutory U.S. federal income tax rate 21.0 % 21.0 % 35.0 % Net difference resulting from: State and local taxes, net of federal income tax benefit 3.2 3.4 2.1 Foreign withholding tax 1.8 0.3 — Foreign derived intangible income (0.8 ) (1.9 ) — Foreign operations tax effect — 0.3 (2.8 ) Research and experimentation tax credits (1.2 ) (0.6 ) (0.7 ) Foreign tax credit (8.0 ) (1.5 ) — Domestic manufacturing deduction — — (4.4 ) Nondeductible expenses 2.5 0.7 0.7 ESOP dividends — (0.1 ) (0.2 ) Branch income 0.6 — 1.1 Tax return to accrual adjustments (9.4 ) — — State deferred taxes (7.9 ) — — Changes due to the Tax Reform Act — — (54.3 ) Global intangible low-taxed income — 2.3 — Change in valuation allowance 9.0 — — Other (0.3 ) (0.7 ) (1.6 ) Effective income tax rate 10.5 % 23.2 % (25.1 )% Deferred tax assets and liabilities —Significant components of deferred tax assets and liabilities were as follows: (in thousands) December 31, 2019 December 31, 2018 Deferred tax assets attributable to: Accrued compensation $ 8,725 $ 8,146 Accrued expenses, principally for state income taxes, interest and warranty 455 2,807 Net operating loss and other carryforwards 5,937 766 Inventories 1,380 — Accounts receivable, principally due to allowance for doubtful accounts 1,699 973 Long-term liabilities, principally warranty and exit cost 6,178 505 Other assets 1,202 64 Deferred tax assets 25,576 13,261 Valuation allowance (6,027 ) (722 ) Deferred tax assets, net of valuation allowance $ 19,549 $ 12,539 Deferred tax liabilities attributable to: Inventories $ — $ (2,061 ) Intangible assets, including goodwill (66,736 ) (83,436 ) Property, plant and equipment (36,873 ) (25,520 ) Deferred tax liabilities (103,609 ) (111,017 ) Net deferred tax liabilities $ (84,060 ) $ (98,478 ) Other non-current assets $ — $ 1,294 Deferred income taxes (84,060 ) (99,772 ) $ (84,060 ) $ (98,478 ) Effective Tax Rate. Our effective tax rate was 10.5% for 2019 compared to 23.2% for 2018. The year-over-year decrease in the effective tax rate was primarily driven by deferred tax benefits associated with the 2018 pre-Separation tax return and a reduction in the combined state tax rate from 2018 to 2019 reflecting lower than estimated state income tax. Net operating loss carryforwards. As of December 31, 2019 , our deferred tax asset balance included non-U.S. net operating loss carryforwards of $1.8 million . This entire balance is available to be carried forward and will expire during the years 2024 through 2038 . We have established valuation allowances by jurisdiction against the full amount of our net operating loss carryforwards as it is more likely that not these assets will not be realized. Foreign tax credit carryforwards. As of December 31, 2019, our deferred tax asset balance included U.S. foreign tax credit carryforwards of $4.2 million . This entire balance is available to be carried forward and will expire during 2029 . We maintain a valuation allowance against the full amount of our U.S. foreign tax credit carryforwards as it is more likely than not that these assets will not be realized. Tax Reform Act. The Tax Reform Act, enacted on December 22, 2017 , reduced the U.S. corporate income tax rate from a maximum of 35% to a flat 21% rate, effective January 1, 2018 . As a result of the reduction in the U.S. corporate income tax rate, we revalued our ending net deferred tax liabilities as of December 31, 2017, and recognized a provisional tax benefit of $53.2 million . The Tax Reform Act also imposed a tax for a one-time deemed repatriation of post-1986 unremitted foreign earnings and profits through the year ended December 31, 2017. We recorded a provisional tax expense related to the deemed repatriation of $3.9 million during the year ended December 31, 2017. We completed our accounting for the income tax effects of the Tax Reform Act in 2018 with no change to the provisional amounts recorded during the year ended December 31, 2017. The GILTI provisions of the Tax Reform Act require us to include in our U.S. income tax return foreign subsidiary earnings in excess of an allowable return on the foreign subsidiary’s tangible assets. We elected to account for GILTI tax in the period in which it is incurred, and therefore did not provide any deferred tax impacts of GILTI in our consolidated financial statements for the year ended December 31, 2019 . The impact of GILTI (net of foreign tax credits) had an immaterial impact to our income tax provision for the year ended December 31, 2019 . Unrecognized tax benefits. We file federal, state, and local tax returns in the United States as well as foreign tax returns. We are routinely audited by the tax authorities in these jurisdictions, and a number of audits are currently underway. We believe all income tax uncertainties have been properly accounted. We have not recorded a liability for uncertain tax positions as of December 31, 2019 and 2018 . Undistributed earnings. As of December 31, 2019, we did not provide for deferred taxes associated with withholding taxes on our earnings of our subsidiaries that are permanently reinvested.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2019
Defined Benefit Plan [Abstract]
Employee Benefit Plans	EMPLOYEE BENEFIT PLANS Prior to the Separation, certain of our employees participated in defined benefit and non-qualified plans sponsored by Dover, which included participants of other Dover subsidiaries. For periods prior to the Separation, we accounted for such plans as multi-employer benefit plans and recorded a proportionate share of the cost in our consolidated statements of income. For the years ended December 31, 2018 and 2017, costs associated with these multi-employer plans amounted to $1.6 million , and $4.6 million , respectively. Dover provided a defined benefit pension plan for its eligible U.S. employees and retirees (“U.S. Pension Plan”). Shortly before the Separation, Apergy participants in the U.S. Pension Plan (other than Norris USW participants) fully vested in their benefits, and all participants ceased accruing benefits. In addition, Apergy did not assume any funding requirements or obligations related to the U.S. Pension Plan upon the Separation. Norris USW participants were moved to a new pension plan and continued to accrue benefits. Dover also provided a defined benefit pension plan for its eligible salaried non-U.S. employees and retirees in Canada (“Canada Salaried Pension Plan”). The Canada Salaried Pension Plan, including all assets and liabilities, was transferred to Apergy at the Separation. Shortly before the Separation, all non-Apergy participants in this plan ceased accruing benefits nor were permitted to make contributions, as applicable. The non-Apergy participants may elect a lump sum cash payment post Separation that will be the responsibility of Apergy and will be funded out of the plan assets. Dover provided to certain U.S. management employees, through non-qualified plans, supplemental retirement benefits in excess of qualified plan limits imposed by federal tax law. As of January 1, 2018, Apergy participants in these non-qualified plans no longer accrued benefits nor were permitted to make contributions, as applicable. We assumed the funding requirements and related obligations attributable to Apergy employees associated with these non-qualified plans upon the Separation. The non-qualified plans are unfunded and contributions are made as benefits are paid. At the Separation, we recognized $6.1 million of liabilities and $2.4 million of accumulated other comprehensive loss, net of tax, related to plans previously accounted for as multi-employer plans prior to the Separation. We sponsor non-qualified plans covering certain U.S. employees and retirees. The plans provide supplemental retirement benefits in excess of qualified plan limits imposed by federal tax law. The plans are closed to new hires and all benefits under the plans are frozen. Obligations and Funded Status The funded status of our benefit plans, together with the associated balances recognized in our consolidated balance sheets as of December 31, 2019 and 2018 , were as follows: Pensions Other post-retirement benefits (in thousands) 2019 2018 2019 2018 Projected benefit obligation at January 1 $ 15,948 $ 3,881 $ 13,061 $ 14,197 Service cost 760 598 — — Interest cost 588 455 503 448 Benefits paid (328 ) (370 ) (1,751 ) (1,022 ) Actuarial (gain)/loss (1) 2,784 (530 ) 1,398 (562 ) Liabilities assumed from the Separation — 14,348 — — Amendments 250 — — — Settlements and curtailments (2,156 ) (1,763 ) — — Foreign currency translation and other 503 (671 ) — — Projected benefit obligation at December 31 18,349 15,948 13,211 13,061 Fair value of plan assets at January 1 15,130 3,993 — — Actual return on plan assets 1,888 (76 ) — — Company contributions 1,486 4,740 1,751 1,022 Benefits paid (328 ) (370 ) (1,751 ) (1,022 ) Assets assumed from the Separation — 9,227 — — Settlements and curtailments (2,156 ) (1,763 ) — — Foreign currency translation and other 467 (621 ) — — Fair value of plan assets at December 31 16,487 15,130 — — Funded (unfunded) status at December 31 $ (1,862 ) $ (818 ) $ (13,211 ) $ (13,061 ) Other non-current assets $ 18 $ 146 $ — $ — Accrued compensation and employee benefits — — (1,592 ) (1,598 ) Other long-term liabilities (1,880 ) (964 ) (11,619 ) (11,463 ) Funded (unfunded) status $ (1,862 ) $ (818 ) $ (13,211 ) $ (13,061 ) Accumulated benefit obligations $ 16,235 $ 14,076 $ 13,211 $ 13,061 _______________________ (1) Actuarial losses incurred for year ended December 31, 2019 primarily relate to change in discount rate assumption utilized in estimating the projected benefit obligation. The following table summarizes the pre-tax amounts in accumulated other comprehensive loss as of December 31, 2019 and 2018 that have not been recognized as components of net periodic benefit cost: Pensions Other post-retirement benefits (in thousands) 2019 2018 2019 2018 Pre-tax amounts recognized in accumulated other comprehensive loss (income): Unrecognized net actuarial loss $ 4,699 $ 3,586 $ 6,883 $ 5,685 Unrecognized prior service cost 274 25 — — Unrecognized net transition asset (10 ) (8 ) — — Accumulated other comprehensive loss $ 4,963 $ 3,603 $ 6,883 $ 5,685 The following table summarizes the accumulated benefit obligations and fair values of plan assets where the accumulated benefit obligation exceeds the fair value of plan assets as of December 31, 2019 and 2018 : Pensions Other post-retirement benefits (in thousands) 2019 2018 2019 2018 Aggregate accumulated benefit obligation $ 4,108 $ 3,722 $ 13,211 $ 13,061 Aggregate fair value of plan assets 3,449 3,672 — — The following table summarizes the projected benefit obligations and fair values of plan assets where the projected benefit obligation exceeds the fair value of plan assets as of December 31, 2019 and 2018 : Pensions Other post-retirement benefits (in thousands) 2019 2018 2019 2018 Aggregate projected benefit obligation $ 13,834 $ 12,334 $ 13,211 $ 13,061 Aggregate fair value of plan assets 11,954 11,370 — — Net Periodic Benefit Cost Components of the net periodic benefit cost were as follows: Pensions Other post-retirement benefits (in thousands) 2019 2018 2017 2019 2018 2017 Service cost $ 760 $ 598 $ 106 $ — $ — $ — Interest cost 588 455 137 503 448 621 Expected return on plan assets (733 ) (593 ) (198 ) — — — Amortization of prior service cost 2 1 2 — — — Amortization of actuarial loss 162 127 68 200 202 330 Amortization of transition obligation 2 1 (1 ) — — — Settlement loss 508 479 — — — — Other — — — — — (1 ) Net periodic benefit cost $ 1,289 $ 1,068 $ 114 $ 703 $ 650 $ 950 A ssumptions The following weighted-average assumptions were used to determine the benefit obligations: Pensions Other post-retirement benefits 2019 2018 2019 2018 Discount rate 3.11 % 3.90 % 3.00 % 4.10 % The following weighted-average assumptions were used to determine the net periodic benefit cost: Pensions Other post-retirement benefits 2019 2018 2017 2019 2018 2017 Discount rate 3.85 % 3.68 % 3.75 % 4.10 % 3.35 % 3.55 % Expected return on plan assets 4.89 % 4.80 % 5.50 % Plan Assets The primary financial objective of the plans is to secure participant retirement benefits. Accordingly, the key objective in the plans’ financial management is to promote stability and, to the extent appropriate, growth in the funded status. We have retained professional investment managers to manage the plans’ assets and implement the investment process. The investment managers have the authority and responsibility to select appropriate investments in the asset classes specified by the terms of their applicable prospectus or investment manager agreements with the plans. The assets of the plans are invested to achieve an appropriate return for the plans consistent with a prudent level of risk. The asset return objective is to achieve, as a minimum over time, the passively managed return earned by market index funds, weighted in the proportions outlined by the asset class exposures identified in the plans’ strategic allocation. Our pension plan assets measured at fair value on a recurring basis are presented below. Refer to “Fair value measurements” in Note 1 to these consolidated financial statements for a description of the levels. Pensions December 31, 2019 December 31, 2018 (in thousands) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Mutual funds $ 5,170 $ 7,868 $ — $ 13,038 $ 4,775 $ 6,683 $ — $ 11,458 Cash and cash equivalents 3,449 — — 3,449 3,672 — — 3,672 Total $ 8,619 $ 7,868 $ — $ 16,487 $ 8,447 $ 6,683 $ — $ 15,130 Mutual funds are categorized as either Level 1 or 2 depending on the nature of the observable inputs. We had no Level 3 plan assets as of December 31, 2019 and 2018 . The methods described above may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Expected contributions in 2020 are $1.1 million . The non-qualified plans are unfunded and contributions are made as benefits are paid. Estimated Future Benefit Payments Estimated future benefit payments to retirees from our various pension and other post-retirement benefit plans are outlined in the table below. Actual benefit payments may differ from these expected payments. (in thousands) Pensions Other Post-retirement benefits 2020 $ 1,139 $ 1,592 2021 857 1,424 2022 941 1,295 2023 785 1,167 2024 782 1,040 2025-2029 5,427 3,557 Defined Contribution Plan We offer a defined contribution retirement plan which covers the majority of our U.S. employees, as well as employees in certain other countries. Expense relating to defined contribution plans was $9.0 million , $9.6 million and $8.2 million for the years ended December 31, 2019 , 2018 and 2017 , respectively.

Equity and Cash Incentive Progr

Equity and Cash Incentive Program	12 Months Ended
	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Equity and Cash Incentive Program	EQUITY AND CASH INCENTIVE PROGRAMS Prior to the Separation, Dover granted share-based awards to its officers and other key employees, including certain Apergy individuals. The principal awards issued under Dover’s stock-based compensation plans included stock options, stock-settled stock appreciation rights, restricted stock units and performance share awards. All awards granted under the program consisted of Dover common shares and are not necessarily indicative of the results that Apergy would have experienced as a stand-alone public company for the periods presented prior to the Separation. Effective with the Separation, outstanding Dover share-based awards were converted to Apergy share-based awards, with the exception of outstanding Dover performance share awards that relate to performance periods ending after the Separation. Such performance share awards were cancelled effective with the Separation. In connection with the Separation, the Board of Directors of Apergy adopted the Apergy Corporation 2018 Equity and Cash Incentive Plan (“2018 Plan”). The 2018 Plan was also approved by Dover in its capacity as the sole stockholder of Apergy at the time of adoption. A total of 6.5 million shares of common stock are reserved for issuance under the 2018 Plan, subject to customary adjustments arising from stock splits and other similar changes. The 2018 Plan authorized the grant of stock options, stock-settled stock appreciation rights (“SARs”), restricted stock awards, restricted stock units, performance share awards, cash performance awards, directors’ shares and deferred stock units. The Apergy Compensation Committee determines the exercise price for options and the base price of SARs, which may not be less than the fair market value of Apergy common stock on the date of grant. Generally, stock options or SARs vest after three years of service and expire at the end of ten years . Performance share awards vest if Apergy achieves certain pre-established performance targets based on specified performance criteria over a performance period of not less than three years . Stock-based compensation expense is reported within “selling, general and administrative expense” in the consolidated statements of income. Stock-based compensation expense relating to all stock-based incentive plans was as follows: Years Ended December 31, 2019 2018 2017 Stock-based compensation expense $ 10,250 $ 5,375 $ 2,236 Tax benefit (2,153 ) (1,141 ) (774 ) Stock-based compensation expense, net of tax $ 8,097 $ 4,234 $ 1,462 SARs We did not issue SARs during 2019 and 2018. In 2017, SARs were granted by Dover and the fair value of each SAR granted was estimated on the grant date using a Black-Scholes option-pricing model utilizing the following assumptions: 2017 Risk-free interest rate 1.80 % Dividend yield 2.27 % Expected life (years) 4.6 Volatility 21.90 % Grant price $ 79.28 Fair value at date of grant $ 12.63 A summary of activity relating to SARs outstanding for the year ended December 31, 2019 , is as follows: SARs Shares Weighted-Average Exercise Price Weighted-Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) Outstanding at January 1, 2019 477,950 $ 29.43 Forfeited / expired (7,030 ) 34.13 Exercised (48,559 ) 25.95 Outstanding at December 31, 2019 422,361 29.75 6.1 $ 1,799 Exercisable at December 31, 2019 253,901 $ 26.84 5.4 $ 1,799 Unrecognized compensation expense related to SARs not yet exercisable was not material to our consolidated financial statements as of December 31, 2019 . Other information regarding the exercise of SARs is presented below: (in thousands) 2019 2018 2017 SARs: Fair value of SARs that became exercisable $ 662 $ 310 $ 1,239 Aggregate intrinsic value of SARs exercised 629 40 2,787 Performance Share Awards - Dover Performance shares granted by Dover were cancelled effective with the Separation. Performance share awards granted prior to the Separation were considered performance condition awards as attainment was based on Dover’s performance relative to established internal metrics. The fair value of these awards was determined using Dover’s closing stock price on the date of grant. The expected attainment of the internal metrics for these awards was analyzed each reporting period, and the related expense was adjusted based on expected attainment. The cumulative effect on current and prior periods of a change in expected attainment is recognized in stock-based compensation expense in the period of change. The fair value and average attainment used in determining stock-based compensation expense of the performance shares issued in 2017 are as follows: Performance shares: 2017 Fair value per share at date of grant $ 79.28 Average attainment rate reflected in expense 0.0 % Performance Share Awards - Apergy Market Vesting Conditions We granted 46,459 and 86,817 performance share awards subject to market vesting conditions during 2019 and 2018, respectively, under the 2018 Plan. These awards vest if Apergy achieves certain pre-established performance targets based on specified performance criteria over a performance period of not less than three years . The performance targets for these awards are classified as a market vesting condition, therefore the compensation cost was calculated using the grant date fair market value, as estimated using a Monte Carlo simulation, and is not subject to change based on future events. The fair value used in determining stock-based compensation expense of the performance share awards issued in 2019 and 2018 is as follows: Performance shares: 2019 2018 Fair value per share at date of grant $ 57.43 $ 56.32 Performance Vesting Conditions We granted 46,460 performance share awards subject to performance vesting conditions during 2019 under the 2018 Plan. These awards are considered performance condition awards as attainment is based on Apergy’s performance relative to established internal metrics. The fair value of these awards was determined using Apergy’s closing stock price on the date of grant. The expected attainment of the internal metrics for these awards is analyzed each reporting period, and the related expense is adjusted based on expected attainment. The cumulative effect on current and prior periods of a change in expected attainment is recognized in stock-based compensation expense in the period of change. The fair value and average attainment used in determining stock-based compensation expense of the performance shares issued in 2019 are as follows: Performance shares: 2019 Fair value per share at date of grant $ 40.22 Average attainment rate reflected in expense 100.0 % A summary of activity for Apergy’s performance share awards for the year ended December 31, 2019 , is as follows: Shares Weighted-Average Grant-Date Fair Value Unvested at January 1, 2019 86,817 $ 56.32 Granted 92,919 48.83 Forfeited (5,010 ) 52.60 Vested — — Unvested at December 31, 2019 174,726 $ 52.44 Unrecognized compensation expense related to unvested performance share awards as of December 31, 2019 , was $5.3 million , which will be recognized over a weighted average period of 1.8 years . Restricted Stock Units Restricted stock units may be granted at no cost to certain officers and key employees. Restricted stock units generally vest over a three-or-four-year period. A summary of activity for restricted stock units for the year ended December 31, 2019 , is as follows: Shares Weighted-Average Grant-Date Fair Value Unvested at January 1, 2019 414,840 $ 41.91 Granted 183,143 37.82 Forfeited (16,498 ) 40.74 Vested (141,437 ) 39.35 Unvested at December 31, 2019 440,048 $ 41.07 Unrecognized compensation expense relating to unvested restricted stock as of December 31, 2019 , was $12.6 million , which will be recognized over a weighted average period of 1.5 years .

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS We had no outstanding derivative contracts as of December 31, 2019 and 2018 . Other assets and liabilities measured at fair value on a recurring basis as of December 31, 2019 and 2018 , were not significant; thus, no fair value disclosures are presented. The fair value, based on Level 1 quoted market rates, of our Senior Notes was approximately $316.7 million as of December 31, 2019 , as compared to the $300.0 million face value of the debt. The fair value, based on Level 2 quoted market rates, of our term loan facility was approximately $266.2 million as of December 31, 2019 , as compared to the $265.0 million face value of the debt. The carrying amounts of cash and cash equivalents, trade receivables, and accounts payable, as well as amounts included in other current assets and other current liabilities that meet the definition of financial instruments, approximate fair value due to their short-term nature. Impairment of Assets Held For Sale In March 2019, we classified our pressure vessel manufacturing business in our Production & Automation Technologies segment as held for sale and recognized an impairment loss of $1.7 million to adjust the carrying amount of the disposal group to fair value. The fair value was determined by a negotiated selling price through a non-binding expression of interest with a third party, a Level 3 input. We completed the sale of our pressure vessel manufacturing business in June 2019. See Note 6—Dispositions for additional information. Acquisition On July 31, 2019, Apergy entered into an asset purchase agreement to acquire certain assets, which meet the definition of a business. See Note 5—Acquisitions for additional information. The fair value of the contingent consideration is based on the probability of the acquired business achieving an eighteen month revenue target, a Level 3 input. As of December 31, 2019, the estimated fair value of the contingent consideration liability was $1.5 million , as attainment of the revenue target was deemed probable. Credit Risk By their nature, financial instruments involve risk, including credit risk, for non-performance by counterparties. Financial instruments that potentially subject us to credit risk primarily consist of trade receivables. We manage credit risk on trade receivables by transacting only with what management believes are financially secure counterparties, requiring credit approvals and credit limits, and monitoring counterparties’ financial condition. Our maximum exposure to credit loss in the event of non-performance by a customer is limited to the amount drawn and outstanding on account. Allowances for losses on trade receivables are established based on collectability assessments.

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Segment Information	SEGMENT INFORMATION We report our results of operations in the following reporting segments: Production & Automation Technologies and Drilling Technologies. Management’s determination of our reporting segments was made on the basis of our strategic priorities within each segment and corresponds to the manner in which our chief operating decision maker reviews and evaluates operating performance to make decisions about resources to be allocated to the segment. In addition to our strategic priorities, segment reporting is also based on differences in the products and services we provide. Our reporting segments are: • Production & Automation Technologies—designs, manufactures, markets and services a full range of artificial lift equipment, end-to-end digital automation solutions, as well as other production equipment. Production & Automation Technologies’ products are sold under a collection of brands including Harbison-Fischer, Norris, Alberta Oil Tool, Oil Lift Technology, PCS Ferguson, Pro-Rod, Upco, Unbridled ESP, Norriseal-Wellmark, Quartzdyne, Spirit, Theta, Timberline and Windrock. • Drilling Technologies—designs, manufactures and markets polycrystalline diamond cutters and bearings for use in oil and gas drill bits under the US Synthetic brand. Segment revenue and segment operating profit Years Ended December 31, (in thousands) 2019 2018 2017 Segment revenue: Production & Automation Technologies $ 884,364 $ 932,591 $ 782,813 Drilling Technologies 246,887 285,565 227,653 Total revenue $ 1,131,251 $ 1,218,156 $ 1,010,466 Income before income taxes: Segment operating profit: Production & Automation Technologies $ 54,024 $ 74,187 $ 24,567 Drilling Technologies 73,497 98,620 74,317 Total segment operating profit 127,521 172,807 98,884 Corporate expense and other (1) 29,034 23,806 9,666 Interest expense, net 39,301 27,648 863 Income before income taxes $ 59,186 $ 121,353 $ 88,355 _______________________ (1) Corporate expense and other includes costs not directly attributable or allocated to our reporting segments such as corporate executive management and other administrative functions, costs related to our Separation from Dover and the results attributable to our noncontrolling interest. Segment assets December 31, (in thousands) 2019 2018 Production & Automation Technologies $ 1,668,319 $ 1,702,396 Drilling Technologies 209,880 231,438 Corporate 44,626 39,282 Total assets $ 1,922,825 $ 1,973,116 Geographic segment information December 31, (in thousands) 2019 2018 Property, plant, and equipment, net: United States $ 238,464 $ 233,809 Middle East 2,760 3,616 Canada 5,749 6,299 Australia 789 254 Latin & South America 419 350 Total property, plant, and equipment, net $ 248,181 $ 244,328 See Note 13—Revenue for information related to revenue by geography and end markets. Other business segment information Capital Expenditures Years Ended December 31, Depreciation & Amortization Years Ended December 31, (in thousands) 2019 2018 2017 2019 2018 2017 Production & Automation Technologies $ 30,291 $ 45,190 $ 28,483 $ 110,131 $ 112,955 $ 100,912 Drilling Technologies 9,061 11,123 8,171 9,263 11,037 11,950 Corporate 428 1,605 — 544 469 — Total $ 39,780 $ 57,918 $ 36,654 $ 119,938 $ 124,461 $ 112,862

Condensed Consolidating Financi

Condensed Consolidating Financial Information	12 Months Ended
	Dec. 31, 2019
Condensed Financial Information Disclosure [Abstract]
Condensed Consolidating Financial Information	CONDENSED CONSOLIDATING FINANCIAL INFORMATION Apergy Corporation has senior notes outstanding, the payment obligations of which are fully and unconditionally guaranteed by certain 100-percent-owned subsidiaries of Apergy on a joint and several basis. The following financial information presents the results of operations, financial position and cash flows for: • Apergy Corporation (issuer) • 100-percent-owned guarantor subsidiaries • All other non-guarantor subsidiaries • Adjustments and eliminations necessary to present Apergy results on a consolidated basis. This condensed consolidating financial information should be read in conjunction with the accompanying consolidated financial statements and related notes. As disclosed in Note 1—Basis Of Presentation And Summary Of Significant Accounting Policies , we have revised prior period financial statements for the years ended December 31, 2018 and 2017. The errors, which were immaterial to our previously filed consolidated financial statements, are not material to this disclosure. We have revised the Condensed Consolidating Statements of Income for the years ended December 31, 2018 and 2017 for Apergy Corporation, Subsidiary Guarantors, Subsidiary Non-guarantors, and Adjustments and eliminations. We have revised the Condensed Consolidating Balance Sheet as of December 31, 2018 for Apergy Corporation, Subsidiary Guarantors, Subsidiary Non-guarantors, and Adjustments and eliminations. Year Ended December 31, 2019 (in thousands) Apergy Corporation Subsidiary Guarantors Subsidiary Non-guarantors Adjustments and eliminations Total Product revenue $ — $ 884,355 $ 116,275 $ — $ 1,000,630 Other revenue — 120,677 53,830 (43,886 ) 130,621 Total revenue — 1,005,032 170,105 (43,886 ) 1,131,251 Cost of goods and services — 654,440 143,962 (44,255 ) 754,147 Gross profit — 350,592 26,143 369 377,104 Selling, general and administrative expense 271 251,834 23,909 — 276,014 Interest expense, net 38,673 594 34 — 39,301 Other expense, net — 937 1,666 — 2,603 Income (loss) before income taxes and equity in earnings of affiliates (38,944 ) 97,227 534 369 59,186 Provision for (benefit from) income taxes (8,906 ) 13,934 1,122 76 6,226 Income (loss) before equity in earnings of affiliates (30,038 ) 83,293 (588 ) 293 52,960 Equity in earnings of affiliates 82,202 4,313 9,294 (95,809 ) — Net income 52,164 87,606 8,706 (95,516 ) 52,960 Net income attributable to noncontrolling interest — — 796 — 796 Net income attributable to Apergy $ 52,164 $ 87,606 $ 7,910 $ (95,516 ) $ 52,164 Comprehensive income attributable to Apergy $ 51,033 $ 86,077 $ 8,296 $ (94,373 ) $ 51,033 Year Ended December 31, 2018 (in thousands) Apergy Corporation Subsidiary Guarantors Subsidiary Non-guarantors Adjustments and eliminations Total Product revenue $ — $ 965,057 $ 125,161 $ — $ 1,090,218 Other revenue — 126,508 45,112 (43,682 ) 127,938 Total revenue — 1,091,565 170,273 (43,682 ) 1,218,156 Cost of goods and services — 696,874 147,255 (42,977 ) 801,152 Gross profit — 394,691 23,018 (705 ) 417,004 Selling, general and administrative expense 1,614 241,796 21,537 — 264,947 Interest expense, net 26,973 633 42 — 27,648 Other expense, net — 1,322 1,733 1 3,056 Income before income taxes and equity in earnings of affiliates (28,587 ) 150,940 (294 ) (706 ) 121,353 Benefit from income taxes (8,727 ) 38,395 (1,358 ) (148 ) 28,162 Income before equity in earnings of affiliates (19,860 ) 112,545 1,064 (558 ) 93,191 Equity in earnings of affiliates 112,597 25,652 45,308 (183,557 ) — Net income 92,737 138,197 46,372 (184,115 ) 93,191 Net income attributable to noncontrolling interest — — 454 — 454 Net income attributable to Apergy $ 92,737 $ 138,197 $ 45,918 $ (184,115 ) $ 92,737 Comprehensive income attributable to Apergy $ 79,983 $ 136,893 $ 34,466 $ (171,359 ) $ 79,983 Year Ended December 31, 2017 (in thousands) Apergy Corporation Subsidiary Guarantors Subsidiary Non-guarantors Adjustments and eliminations Total Product revenue $ — $ 799,337 $ 123,355 $ — $ 922,692 Other revenue — 82,725 41,152 (36,103 ) 87,774 Total revenue — 882,062 164,507 (36,103 ) 1,010,466 Cost of goods and services — 585,592 140,717 (35,911 ) 690,398 Gross profit — 296,470 23,790 (192 ) 320,068 Selling, general and administrative expense — 201,797 19,610 — 221,407 Interest expense, net — 834 29 — 863 Other expense, net — 10,169 (726 ) — 9,443 Income before income taxes and equity in loss of affiliates — 83,670 4,877 (192 ) 88,355 Benefit from income taxes — (10,510 ) (11,587 ) (67 ) (22,164 ) Income before equity in loss of affiliates — 94,180 16,464 (125 ) 110,519 Equity in earnings of affiliates 109,589 21,294 10,335 (141,218 ) — Net income 109,589 115,474 26,799 (141,343 ) 110,519 Net income attributable to noncontrolling interest — — 930 — 930 Net income attributable to Apergy $ 109,589 $ 115,474 $ 25,869 $ (141,343 ) $ 109,589 Comprehensive income attributable to Apergy $ 116,830 $ 118,354 $ 30,231 $ (148,585 ) $ 116,830 December 31, 2019 (in thousands) Apergy Corporation Subsidiary Guarantors Subsidiary Non-guarantors Adjustments and eliminations Total Assets Cash and cash equivalents $ 108 $ 21,705 $ 13,477 $ — $ 35,290 Receivables 572 190,101 39,000 (9,799 ) 219,874 Inventories, net — 181,596 31,015 (1,269 ) 211,342 Prepaid expenses and other current assets 40 25,571 1,323 — 26,934 Total current assets 720 418,973 84,815 (11,068 ) 493,440 Property, plant and equipment, net — 236,295 11,886 — 248,181 Goodwill — 639,281 271,832 — 911,113 Advances due from affiliates 495,699 20,582 87,686 (603,967 ) — Investment in subsidiaries 1,095,712 683,003 552,386 (2,331,101 ) — Intangible assets, net — 168,711 69,996 — 238,707 Other assets 3,074 20,426 7,884 — 31,384 Total assets 1,595,205 2,187,271 1,086,485 (2,946,136 ) 1,922,825 Liabilities and Equity Accounts payable 60 102,120 27,910 (9,799 ) 120,291 Accrued compensation and employee benefits — 31,974 6,496 — 38,470 Current portion of finance lease liabilities — 4,745 100 — 4,845 Accrued expenses and other current liabilities 3,639 28,627 5,078 (1,269 ) 36,075 Total current liabilities 3,699 167,466 39,584 (11,068 ) 199,681 Advances due to affiliates — 583,386 20,581 (603,967 ) — Long-term debt 555,292 4,388 141 — 559,821 Deferred income taxes — 68,286 15,774 — 84,060 Other long-term liabilities — 36,610 6,439 — 43,049 Total liabilities 558,991 860,136 82,519 (615,035 ) 886,611 Equity: Stockholders’ capital 1,036,214 1,336,012 1,035,872 (2,331,101 ) 1,076,997 Accumulated other comprehensive loss — (8,877 ) (35,160 ) — (44,037 ) Total stockholders’ equity 1,036,214 1,327,135 1,000,712 (2,331,101 ) 1,032,960 Noncontrolling interest — — 3,254 — 3,254 Total equity 1,036,214 1,327,135 1,003,966 (2,331,101 ) 1,036,214 Total liabilities and equity $ 1,595,205 $ 2,187,271 $ 1,086,485 $ (2,946,136 ) $ 1,922,825 December 31, 2018 (in thousands) Apergy Corporation Subsidiary Guarantors Subsidiary Non-guarantors Adjustments and eliminations Total Assets Cash and cash equivalents $ 108 $ 27,533 $ 14,191 $ — $ 41,832 Receivables 1,743 231,718 35,019 (17,044 ) 251,436 Inventories, net — 190,117 30,936 (1,632 ) 219,421 Prepaid expenses and other current assets 24,583 15,387 3,106 (24,542 ) 18,534 Total current assets 26,434 464,755 83,252 (43,218 ) 531,223 Property, plant and equipment, net — 231,373 12,955 — 244,328 Goodwill — 633,771 271,214 — 904,985 Advances due from affiliates 600,802 14,185 82,889 (697,876 ) — Investment in subsidiaries 1,008,325 682,545 540,622 (2,231,492 ) — Intangible assets, net — 198,531 85,157 — 283,688 Other assets 3,996 2,818 2,078 — 8,892 Total assets 1,639,557 2,227,978 1,078,167 (2,972,586 ) 1,973,116 Liabilities and Equity Accounts payable 22 123,812 33,335 (17,044 ) 140,125 Accrued compensation and employee benefits — 35,278 5,268 — 40,546 Current portion of finance lease liabilities — 4,320 — — 4,320 Accrued expenses and other current liabilities 4,929 46,458 3,548 (26,174 ) 28,761 Total current liabilities 4,951 209,868 42,151 (43,218 ) 213,752 Intercompany notes payable — 683,700 14,176 (697,876 ) — Long-term debt 658,623 4,462 122 — 663,207 Deferred income taxes — 79,344 20,428 — 99,772 Other long-term liabilities — 19,441 961 — 20,402 Total liabilities 663,574 996,815 77,838 (741,094 ) 997,133 Equity: Stockholders’ capital 975,983 1,238,517 1,033,423 (2,231,492 ) 1,016,431 Accumulated other comprehensive loss — (7,354 ) (35,552 ) — (42,906 ) Total stockholders’ equity 975,983 1,231,163 997,871 (2,231,492 ) 973,525 Noncontrolling interest — — 2,458 — 2,458 Total equity 975,983 1,231,163 1,000,329 (2,231,492 ) 975,983 Total liabilities and equity $ 1,639,557 $ 2,227,978 $ 1,078,167 $ (2,972,586 ) $ 1,973,116 Year Ended December 31, 2019 (in thousands) Apergy Corporation Subsidiary Guarantors Subsidiary Non-guarantors Adjustments and eliminations Total Cash provided (required) by operating activities $ (48,970 ) $ 204,877 $ (8 ) $ — $ 155,899 Cash provided (required) by investing activities: Capital expenditures — (37,725 ) (2,055 ) — (39,780 ) Proceeds from sale of property, plant and equipment — 4,580 18 — 4,598 Payment on sale of business — (2,194 ) — — (2,194 ) Acquisitions — (12,500 ) — — (12,500 ) Net cash required by investing activities — (47,839 ) (2,037 ) — (49,876 ) Cash provided (required) by financing activities: Proceeds from long-term debt, net of discounts 36,500 — — — 36,500 Repayment of long-term debt (141,500 ) — — — (141,500 ) Advances due to (from) affiliates 153,970 (155,578 ) 1,608 — — Payments on capital lease obligations — (5,493 ) (62 ) — (5,555 ) Payments related to taxes withheld on stock-based — (1,795 ) (53 ) — (1,848 ) Net cash provided (required) by financing activities 48,970 (162,866 ) 1,493 — (112,403 ) Effect of exchange rate changes on cash and cash equivalents — — (162 ) — (162 ) Net (increase) decrease in cash and cash equivalents — (5,828 ) (714 ) — (6,542 ) Cash and cash equivalents at beginning of period 108 27,533 14,191 — 41,832 Cash and cash equivalents at end of period $ 108 $ 21,705 $ 13,477 $ — $ 35,290 Year Ended December 31, 2018 (in thousands) Apergy Corporation Subsidiary Guarantors Subsidiary Non-guarantors Adjustments and eliminations Total Cash provided (required) by operating activities $ (51,728 ) $ 200,907 $ 15,720 $ (999 ) $ 163,900 Cash provided (required) by investing activities: Capital expenditures — (55,070 ) (2,848 ) — (57,918 ) Proceeds from sale of property, plant and equipment — 1,127 60 — 1,187 Proceeds from the sale of businesses — 2,473 — — 2,473 Purchase price adjustments on acquisition — — 53 — 53 Net cash required by investing activities — (51,470 ) (2,735 ) — (54,205 ) Cash provided (required) by financing activities: Proceeds from long-term debt, net of discounts 713,963 — — — 713,963 Payment of debt issue costs (16,006 ) — — — (16,006 ) Repayment of long-term debt (45,000 ) — — — (45,000 ) Advances due to (from) affiliates (600,802 ) 621,109 (20,307 ) — — Distributions to Dover Corporation, net (319 ) (744,258 ) 7,021 999 (736,557 ) Distribution to noncontrolling interest — — (2,720 ) — (2,720 ) Payments on capital lease obligations — (4,518 ) — — (4,518 ) Net cash provided (required) by financing activities 51,836 (127,667 ) (16,006 ) 999 (90,838 ) Effect of exchange rate changes on cash and cash equivalents — — (737 ) — (737 ) Net increase (decrease) in cash and cash equivalents 108 21,770 (3,758 ) — 18,120 Cash and cash equivalents at beginning of period — 5,763 17,949 — 23,712 Cash and cash equivalents at end of period $ 108 $ 27,533 $ 14,191 $ — $ 41,832 Year Ended December 31, 2017 (in thousands) Apergy Corporation Subsidiary Guarantors Subsidiary Non-guarantors Adjustments and eliminations Total Cash provided by operating activities $ — $ 64,422 $ 11,561 $ 67 $ 76,050 Cash provided (required) by investing activities: Capital expenditures — (35,008 ) (1,646 ) — (36,654 ) Acquisitions, net of cash and cash equivalents acquired — — (8,842 ) — (8,842 ) Proceeds from sale of property, plant and equipment — 3,433 114 — 3,547 Net cash required by investing activities — (31,575 ) (10,374 ) — (41,949 ) Cash provided (required) by financing activities: Change in borrowings, net — — (599 ) — (599 ) Distributions to Dover Corporation, net — (27,124 ) (4,001 ) (67 ) (31,192 ) Distribution to noncontrolling interest — — (1,212 ) — (1,212 ) Payments of capital lease obligations — (3,690 ) — — (3,690 ) Net cash required by financing activities — (30,814 ) (5,812 ) (67 ) (36,693 ) Effect of exchange rate changes on cash and cash equivalents — — 277 — 277 Net increase in cash and cash equivalents — 2,033 (4,348 ) — (2,315 ) Cash and cash equivalents at beginning of period — 3,730 22,297 — 26,027 Cash and cash equivalents at end of period $ — $ 5,763 $ 17,949 $ — $ 23,712

Cash Flow Information

Cash Flow Information	12 Months Ended
	Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Cash Flow Information	CASH FLOW INFORMATION Cash payments for income taxes and cash payments for interest incurred related to our debt are as follows: Years Ended December 31, (in thousands) 2019 2018 2017 Cash information: Cash paid for income taxes $ 26,464 $ 27,191 $ 8,698 Cash paid for interest 36,085 21,899 — Supplemental cash flow information related to our lease liabilities is as follows: (in thousands) Statement of Cash Flows Classification December 31, 2019 Cash paid for amounts included in measurement of lease liabilities: Operating leases (1) Operating $ 12,026 Finance leases - interest Operating 439 Finance leases - principal Financing 5,555 Supplemental non-cash information on lease liabilities arising from obtaining right-of-use assets: Operating leases (2) Non-cash $ 38,225 Finance leases (3) Non-cash 6,412 _______________________ (1) Cash required by operating leases is reported net of operating lease expense in the operating section of our consolidated statements of cash flows in “Accrued expenses and other liabilities.” (2) Operating lease additions include lease liabilities recognized at the time of adoption. Refer to Note 2—New Accounting Standards for additional information. (3) Capital lease additions were $4.4 million and $4.6 million for the years ended December 31, 2018 and 2017, respectively. Lease Program Our ESP leased asset program is reported in our Production & Automation Technologies segment. At the time of purchase, assets are recorded to inventory and are transferred to property, plant, and equipment when a customer contracts for an asset under our lease program. During the year ended December 31, 2019 and 2018 , we transferred $75.7 million and $97.0 million of inventory into property, plant, and equipment as a result of assets entering our lease program. Expenditures for surface equipment are reported in “Capital expenditures” in the investing section of our consolidated statement of cash flows. During the years ended December 31, 2019 , 2018 , and 2017 we made cash payments of $16.0 million , $26.7 million , and $14.5 million , respectively, for surface equipment. Expenditures for cable and downhole equipment are reported in “Leased assets” in the operating section of our consolidated statement of cash flows. Additionally, the recovery of the carrying value from the sale of assets on lease is presented in “Leased assets” in the operating section of our consolidated statements of cash flows. Sale of Property In March 2019, we completed the sale of an individual property previously classified as held for sale in our Production & Automation Technologies segment. Net proceeds of $2.1 million were received upon the close of the transaction, resulting in a gain that was not material to the consolidated statement of income during the year ended December 31, 2019 . In December 2019, we completed the sale of an individual property in our Production & Automation Technologies segment. Net proceeds of $0.8 million were received upon the close of the transaction, resulting in a gain of $0.6 million during the year ended December 31, 2019. Sale of Business Refer to Note 6—Dispositions for information related to our sale of our pressure vessel manufacturing business in our Production & Automation Technologies segment in June 2019. In October 2018, we closed on the sale of our Fisher Pump business and related property. Net proceeds of $2.5 million were received upon the close of the transaction, resulting in a gain of $1.3 million during the year ended December 31, 2018.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS On February 14, 2020, Apergy amended its credit agreement, which among other things (i) provides for the incurrence of an additional $150 million of revolving commitments under the amended credit agreement, upon consummation of the Merger as described in Part 1, Item 1, (ii) permits the consummation of the Merger and the incurrence of a senior secured term loan facility in an aggregate amount up to $537 million by ChampionX, and (iii) continues to provide that all obligations under the amended agreement continue to be guaranteed by certain of Apergy’s wholly owned U.S. subsidiaries.

Selected Quarterly Financial Da

Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Financial Information (Unaudited)	SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) 2019 2018 (in thousands, except per share data) 4th Qtr. 3rd Qtr. 2nd Qtr. 1st Qtr. 4th Qtr. 3rd Qtr. 2nd Qtr. 1st Qtr. Revenue $ 247,748 $ 276,839 $ 306,170 $ 300,494 $ 313,133 $ 316,171 $ 305,747 $ 283,105 Gross profit 72,634 92,699 108,760 103,011 106,595 112,327 104,090 93,992 Net income (loss) (1,574 ) 11,588 23,008 19,938 23,347 24,015 21,879 23,950 Net income (loss) attributable to Apergy (1,823 ) 11,394 22,937 19,656 23,187 23,961 21,816 23,773 Basic earnings (loss) per share (1) $ (0.02 ) $ 0.15 $ 0.30 $ 0.25 $ 0.30 $ 0.31 $ 0.28 $ 0.31 Diluted earnings (loss) per share (1) $ (0.02 ) $ 0.15 $ 0.30 $ 0.25 $ 0.30 $ 0.31 $ 0.28 $ 0.31 _______________________ (1) On May 9, 2018, 77,339,828 shares of our common stock were distributed to Dover stockholders in conjunction with the Separation. For comparative purposes, we have assumed the shares issued in conjunction with the Separation to be outstanding as of the beginning of each period prior to the Separation. In addition, we have assumed the potential dilutive securities outstanding as of May 8, 2018, were outstanding and fully dilutive in each of the periods with positive income prior to Separation. The information included in the Selected Quarterly Financial Data table above includes the impact of revision adjustments to correct immaterial errors related to: (i) the assessing and recording of liabilities for state sales tax and associated penalties and interest, primarily resulting in an understatement of our selling, general, and administrative expense and interest expense and (ii) previously recorded amounts including, but not limited to, the write-off of inventory and leased assets, timing of revenue recognition, and revenue classification, that the Company concluded were immaterial to our previously filed consolidated financial statements. See the following tables for the impact of the corrections on each historical quarterly period: Three Months Ended December 31, 2018 (in thousands, except per share data) As Reported Adjustments As Revised Total revenue $ 311,202 $ 1,931 $ 313,133 Gross profit 105,271 1,324 106,595 Net income 22,732 615 23,347 Net income attributable to Apergy $ 22,571 $ 616 $ 23,187 Earnings per share attributable to Apergy: Basic $ 0.29 $ 0.01 $ 0.30 Diluted $ 0.29 $ 0.01 $ 0.30 Three Months Ended September 30, 2019 Three Months Ended September 30, 2018 (in thousands, except per share data) As Reported Adjustments As Revised As Reported Adjustments As Revised Total revenue $ 278,381 $ (1,542 ) $ 276,839 $ 316,468 $ (297 ) $ 316,171 Gross profit 91,519 1,180 92,699 113,734 (1,407 ) 112,327 Net income 10,419 1,169 11,588 25,496 (1,481 ) 24,015 Net income attributable to Apergy $ 10,225 $ 1,169 $ 11,394 $ 25,264 $ (1,303 ) $ 23,961 Earnings per share attributable to Apergy: Basic $ 0.13 $ 0.02 $ 0.15 $ 0.33 $ (0.02 ) $ 0.31 Diluted $ 0.13 $ 0.02 $ 0.15 $ 0.33 $ (0.02 ) $ 0.31 Three Months Ended June 30, 2019 Three Months Ended June 30, 2018 (in thousands, except per share data) As Reported Adjustments As Revised As Reported Adjustments As Revised Total revenue $ 306,054 $ 116 $ 306,170 $ 305,850 $ (103 ) $ 305,747 Gross profit 109,769 (1,009 ) 108,760 103,679 411 104,090 Net income 23,850 (842 ) 23,008 22,075 (196 ) 21,879 Net income attributable to Apergy $ 23,779 $ (842 ) $ 22,937 $ 22,154 $ (338 ) $ 21,816 Earnings per share attributable to Apergy: Basic $ 0.31 $ (0.01 ) $ 0.30 $ 0.29 $ (0.01 ) $ 0.28 Diluted $ 0.31 $ (0.01 ) $ 0.30 $ 0.28 $ — $ 0.28 Three Months Ended March 31, 2019 Three Months Ended March 31, 2018 (in thousands, except per share data) As Reported Adjustments As Revised As Reported Adjustments As Revised Total revenue $ 301,691 $ (1,197 ) $ 300,494 $ 283,126 $ (21 ) $ 283,105 Gross profit 105,549 (2,538 ) 103,011 93,615 377 93,992 Net income 22,569 (2,631 ) 19,938 24,194 (244 ) 23,950 Net income attributable to Apergy $ 22,287 $ (2,631 ) $ 19,656 $ 24,052 $ (279 ) $ 23,773 Earnings per share attributable to Apergy: Basic $ 0.29 $ (0.04 ) $ 0.25 $ 0.31 $ — $ 0.31 Diluted $ 0.29 $ (0.04 ) $ 0.25 $ 0.31 $ — $ 0.31

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Schedule II—Valuation and Qualifying Accounts	Schedule II—Valuation and Qualifying Accounts Allowance for Doubtful Accounts Balance at Beginning of Year Charged to Cost and Expense (1) Accounts Written Off Other Balance at End of Year Year Ended December 31, 2019 $ 4,745 $ 4,955 $ (1,447 ) $ (181 ) $ 8,072 Year Ended December 31, 2018 4,753 2,007 (1,489 ) (526 ) 4,745 Year Ended December 31, 2017 5,634 954 (1,882 ) 47 4,753 _______________________ (1) Net of recoveries on previously reserved or written-off balances. Deferred Tax Valuation Allowance Balance at Beginning of Year Additions Reductions Other Balance at End of Year Year Ended December 31, 2019 $ 722 $ 5,556 $ (251 ) $ — $ 6,027 Year Ended December 31, 2018 1,280 331 (889 ) — 722 Year Ended December 31, 2017 1,082 198 — — 1,280 LIFO Valuation Adjustments Balance at Beginning of Year Charged to Cost and Expense Reductions Other Balance at End of Year Year Ended December 31, 2019 $ 12,867 $ 2,922 $ — $ — $ 15,789 Year Ended December 31, 2018 10,556 2,311 — — 12,867 Year Ended December 31, 2017 9,381 1,175 — — 10,556

New Accounting Standards (Polic

New Accounting Standards (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Changes and Error Corrections [Abstract]
Basis of Presentation	Basis of Presentation Our consolidated financial statements were prepared in U.S. dollars and in accordance with U.S. generally accepted accounting principles (“GAAP”). Prior to the Separation, our results of operations, financial position and cash flows were derived from the consolidated financial statements and accounting records of Dover and reflect the combined historical results of operations, financial position and cash flows of certain Dover entities conducting its upstream oil and gas energy business within Dover’s Energy segment, including an allocated portion of Dover’s corporate costs. These financial statements have been presented as if such businesses had been combined for all periods prior to the Separation. All intercompany transactions and accounts within Dover were eliminated. The assets and liabilities were reflected on a historical cost basis since all of the assets and liabilities presented were wholly owned by Dover and were transferred within the Dover consolidated group. The statements of income also include expense allocations for certain corporate functions historically performed by Dover and not allocated to its operating segments, including corporate executive management, human resources, information technology, facilities, tax, shared services, finance and legal, including the costs of salaries, benefits and other related costs. These expense allocations were based on direct usage or benefit where identifiable, with the remainder allocated on the basis of revenue, headcount or other measures. These pre-Separation combined financial statements may not include all of the actual expenses that would have been incurred had we been a stand-alone public company during the periods presented prior to the Separation and consequently may not reflect our results of operations, financial position and cash flows had we been a stand-alone public company during the periods presented prior to the Separation. Actual costs that would have been incurred if we had been a stand-alone public company would depend on a variety of factors, including organizational structure and strategic decisions made in various areas, including information technology and infrastructure. Prior to the Separation, transactions between Apergy and Dover, with the exception of transactions discussed in Note 3—Related Party Transactions , are reflected in the combined statements of cash flows as a financing activity in “Distributions to Dover Corporation, net.” See Note 3—Related Party Transactions for additional information. No portion of Dover’s third-party debt was historically held by an Apergy entity or was transferred to Apergy; therefore, no interest expense was presented in the combined statements of income for each of the periods presented prior to the Separation. Intercompany notes payable to Dover were presented within “Net parent investment in Apergy” in our combined balance sheet because the notes were not settled in cash. Accordingly, no interest expense related to intercompany debt was presented in the combined statements of income for each of the periods presented prior to the Separation. All financial information presented after the Separation represents the consolidated results of operations, financial position and cash flows of Apergy. Accordingly, our results of operations and cash flows consist of the consolidated results of Apergy from May 9, 2018 to December 31, 2019, and the combined results of operations and cash flows for periods prior to May 9, 2018. Our balance sheets as of December 31, 2019 and 2018, reflect the consolidated balances of Apergy. Our management believes the assumptions underlying these consolidated financial statements, including the assumptions regarding the allocation of corporate expenses from Dover for periods prior to the Separation, are reasonable. The legal transfer of the upstream oil and gas energy businesses from Dover to Apergy occurred on May 9, 2018; however, for ease of reference, and unless otherwise stated or the context otherwise requires, all references to “Apergy Corporation,” “Apergy,” “we,” “us” or “our” refer (i) prior to the Separation, to the Apergy businesses, consisting of entities, assets and liabilities conducting the upstream oil and gas business within Dover’s Energy segment and (ii) after the Separation, to Apergy Corporation and its consolidated subsidiaries.
Use of Estimates	Use of estimates— The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. Such estimates include, but are not limited to, net realizable value of inventories, allowance for doubtful accounts, pension and post-retirement plans, future cash flows associated with impairment testing of goodwill, indefinite-lived intangible assets and other long-lived assets, estimates related to income taxes and estimates related to contingencies.
Cash and Cash Equivalents	Cash and cash equivalents— Cash equivalents are highly liquid, short-term investments with original maturities of three months or less from their date of purchase.
Accounts Receivable and Allowance for Doubtful Accounts	Receivables, net of allowances— An allowance for doubtful accounts is provided on receivables equal to the estimated uncollectible amounts. This estimate is based on historical collection experience, current economic and market conditions and a review of the current status of each customer’s trade accounts receivable.
Inventories	Inventories— Inventories for the majority of our subsidiaries, including all international subsidiaries, are stated at the lower of cost, determined on the first-in, first-out (FIFO) basis, or net realizable value. Other domestic inventories are stated at the lower of cost, determined on the last-in, first-out (LIFO) basis, or market. Under the LIFO method, the cost assigned to items sold is based on the cost of the most recent items purchased. As a result, the costs of the first items purchased remain in inventory and are used to value ending inventory.
Property, Plant and Equipment	Property, plant and equipment— Property, plant and equipment is recorded at cost. Depreciation is provided on the straight-line basis over the estimated useful lives of our assets as follows: buildings and improvements 5 to 31.5 years; machinery and equipment 1 to 7 years; and software 3 to 10 years. Expenditures for maintenance and repairs are expensed as incurred. Gains and losses are realized upon the sale or disposition of assets and are recorded in “Other expense, net” on our consolidated statements of income. Property, plant and equipment are reviewed for impairment whenever events or changes in circumstances indicate the carrying value of the long-lived asset may not be recoverable. The carrying value of a long-lived asset is not recoverable if it exceeds the sum of undiscounted cash flows expected to result from the use and eventual disposition of the asset. If it is determined that an impairment loss has occurred, the impairment loss is measured as the amount by which the carrying value of the long-lived asset exceeds its fair value.
Goodwill, Other Intangible Assets and Long-Lived Assets	Goodwill and other intangible assets— Goodwill is not subject to amortization but is tested for impairment on an annual basis or more frequently if impairment indicators arise. We have established October 1 as the date of our annual test for impairment of goodwill. A quantitative test is used to determine the existence of goodwill impairment and the amount of the impairment loss at the reporting unit level. The quantitative test compares the fair value of a reporting unit with its carrying amount, including goodwill. We use an income-based valuation method, determining the present value of estimated future cash flows, to estimate the fair value of a reporting unit. Significant assumptions used in estimating our reporting unit fair values include (i) annual revenue growth rates; (ii) operating margins; (iii) risk-adjusted discount rate; and (iv) terminal value determined using a long-term growth rate. If the carrying amount of a reporting unit exceeds its fair value, an impairment loss will be recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to the reporting unit. Our finite-lived acquired intangible assets are amortized on a straight-line basis over their estimated useful lives, which generally range from 5 to 15 years. Intangible assets are reviewed for impairment whenever events or changes in circumstances indicate the carrying amount of the intangible asset may not be recoverable. The carrying amount of an intangible asset is not recoverable if it exceeds the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the asset. If it is determined that an impairment loss has occurred, the loss is measured as the amount by which the carrying amount of the intangible asset exceeds its fair value. We have one intangible asset with an indefinite life which is tested annually for impairment.
Revenue Recognition	Revenue Recognition— Prior to January 1, 2018, revenue was recognized when all of the following conditions were satisfied: a) persuasive evidence of an arrangement exists, b) price is fixed or determinable, c) collectability is reasonably assured and d) delivery has occurred or services have been rendered. Beginning in 2018, and in connection with the adoption of ASC Topic 606, revenue is recognized to depict the transfer of control of the related goods and services to the customer. The majority of our revenue is generated through the manufacture and sale of a broad range of specialized products and components, with revenue recognized upon transfer of title and risk of loss, which is generally upon shipment. We account for shipping and handling activities performed after control of a good has been transferred to the customer as a contract fulfillment cost rather than a separate performance obligation. In limited cases, revenue arrangements with customers require delivery, installation, testing, or other acceptance provisions to be satisfied before revenue is recognized. Service revenue is recognized as the services are performed. Software product revenue is recorded when the software product is shipped to the customer or over the term of the contract on a subscription based model. Estimates are used to determine the amount of variable consideration in contracts, as well as the determination of the standalone selling price among separate performance obligations. Some contracts with customers include variable consideration primarily related to volume rebates. We estimate variable consideration at the most likely amount to determine the total consideration which we expect to be entitled. Estimated amounts are included in the transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. Our estimates of variable consideration and the determination of whether to include estimated amounts in the transaction price are largely based on an assessment of our anticipated performance and all information that is reasonably available. We exclude all taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction and collected from a customer (e.g., sales, use, value added, and some excise taxes) from the determination of the transaction price.
Lessor Accounting	Lessor accounting —Our lease arrangements generally allow customers to rent equipment on a daily basis with no stated end date. Customers may return the equipment at any point subsequent to the lease commencement date without penalty. We account for these arrangements as a daily renewal option beginning on the lease commencement date, with the lease term determined as the period in which it is reasonably certain the option will be exercised. Based on our assessment of the lease classification criteria, our lease arrangements have been classified as operating leases. Our lease arrangements generally include lease and non-lease components for which revenue is recognized based on each component’s standalone price. Lease revenue is recognized on a straight-line basis over the term of the lease and is included in “Other revenue” in the consolidated statement of income. Non-lease revenue related to our lease arrangements is recognized in accordance with our revenue recognition accounting policy. Assets in our lease program are reported in “Property, plant, and equipment, net” on our consolidated balance sheets and are depreciated over their estimated useful lives to an estimated salvage value. Leased equipment damaged in operation is generally charged to the customer. Charges for damaged leased equipment is recorded as “Product revenue” and the remaining net book value of the leased asset is expensed as “Costs of goods and services” in the consolidated statements of income.
Lessee Accounting	Lessee accounting —Lease liabilities are measured at the lease commencement date and are based on the present value of remaining payments contractually required under the contract. Payments that are variable in nature are excluded from the measurement of our lease liabilities and are recorded as an expense as incurred. Options to renew or extend a lease are included in the measurement of our lease liabilities only when it is reasonably certain that we will exercise these rights. In estimating the present value of our lease liabilities, payments are discounted at our incremental borrowing rate (“IBR”), which has been applied utilizing a portfolio approach. We utilized information publicly available from companies within our industry with similar credit profiles to construct a company-specific yield curve in order to estimate the rate of interest we would pay to borrow at various lease terms. At lease commencement, we recognize a lease right-of-use asset equal to our lease liability, adjusted for lease payments paid to the lessor prior to the lease commencement date, and any initial direct costs incurred. Operating lease expense is recorded on a straight-line basis over the lease term. For finance leases, we amortize our right-of-use assets on a straight-line basis over the shorter of the asset’s useful life or the lease term. Additionally, interest expense is recognized each period related to the accretion of our lease liabilities over their respective lease terms. Refer to Note 2 for additional information related to practical expedients and elections made under ASC Topic 842.
Stock-Based Compensation	Stock-based compensation— Prior to the Separation, our employees participated in Dover’s stock-based compensation plans. Stock-based compensation was allocated to us by Dover based on the awards and terms previously granted to our employees. The cost of stock-based awards is measured at the grant date and are based on the fair value of the award. The value of the portion of the award that is expected to ultimately vest is recognized as expense on a straight-line basis, generally over the explicit service period and is included in selling, general and administrative expense in our consolidated statements of income. Forfeitures are accounted for as they occur. Expense for awards granted to retirement-eligible employees is recorded over the period from the date of grant through the date the employee first becomes eligible to retire and is no longer required to provide service.
Employee Benefit Plans	Employee benefit plans— Prior to the Separation, Apergy participated in defined benefit plans and non-qualified supplemental retirement plans sponsored by Dover that were accounted for as multi-employer plans in the consolidated financial statements. Apergy also sponsored a defined benefit plan and non-qualified plan during the pre-Separation period. These plans were accounted for as single employer plans in the consolidated financial statements.
Research and Development Costs	Research and development costs—
Income Taxes	Income Taxes— Prior to the Separation, our operations were historically included in Dover’s consolidated federal tax return and certain combined state returns. The income tax expense in our consolidated financial statements for these pre-Separation periods was determined on a stand-alone return basis which requires the recognition of income taxes using the liability method. Under this method, we assume to have historically filed a return separate from Dover, reporting our taxable income or loss and paying applicable tax based on our separate taxable income and associated tax attributes in each tax jurisdiction. Income taxes payable prior to Separation, computed under the stand-alone return basis, were classified in “Net parent investment in Apergy” on our consolidated balance sheet since Dover is legally liable for the tax. Accordingly, changes in income taxes payable for periods prior to the Separation are presented as a component of financing activities in the statement of cash flows. The calculation of income taxes on the separate return basis requires considerable judgment and the use of both estimates and allocations. As a result, our effective tax rate and deferred tax balances will significantly differ from those in the periods prior to the Separation. The Tax Reform Act, enacted on December 22, 2017, significantly changed U.S. tax law by, among other things, lowering corporate income tax rates, implementing a territorial tax system and imposing a repatriation tax on deemed repatriated earnings of foreign subsidiaries. The Tax Reform Act reduced the U.S. corporate income tax rate from a maximum of 35% to a flat 21% rate, effective January 1, 2018. The Tax Reform Act also provided for a one-time deemed repatriation of post-1986 undistributed foreign subsidiary earnings and profits through the year ended December 31, 2017. The Global Intangible Low-Taxed Income (“GILTI”) provisions require us to include in our U.S. income tax return foreign subsidiary earnings in excess of an allowable return on the foreign subsidiary’s tangible assets. We have elected to account for GILTI tax in the period in which it is incurred.
Earnings per Share (“EPS”)	Earnings per share (“EPS”)— Basic EPS is computed using the weighted-average number of common shares outstanding during the year. We use the treasury stock method to compute diluted EPS which gives effect to the potential dilution of earnings that could have occurred if additional shares were issued for awards granted under our incentive compensation and stock plan. The treasury stock method assumes proceeds that would be obtained upon exercise of awards granted under our incentive compensation and stock plan are used to purchase outstanding common stock at the average market price during the period.
Fair Value Measurements	Fair value measurements— We record our financial assets and financial liabilities at fair value. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the reporting date. The fair value framework requires the categorization of assets and liabilities into three levels based upon the assumptions (inputs) used to price the assets or liabilities, with the exception of certain assets and liabilities measured using the net asset value practical expedient, which are not required to be leveled. Level 1 provides the most reliable measure of fair value, whereas Level 3 generally requires significant management judgment. The three levels are defined as follows: • Level 1: Unadjusted quoted prices in active markets for identical assets and liabilities. • Level 2: Observable inputs other than quoted prices included in Level 1. For example, quoted prices for similar assets or liabilities in active markets or quoted prices for identical assets or liabilities in inactive markets. • Level 3: Unobservable inputs reflecting management’s own assumptions about the assumptions market participants would use in pricing the asset or liability.
Derivative Financial Instruments	Derivative financial instruments— Prior to the Separation, we used derivative financial instruments to hedge our exposure to foreign currency exchange rate risk. For derivatives hedging the fair value of assets or liabilities, the changes in fair value of both the derivatives and the hedged items are recorded in earnings. We do not enter into derivative financial instruments for speculative purposes.
Foreign Currency	Foreign currency— Financial statements of operations for which the U.S. dollar is not the functional currency, and are located in non-highly inflationary countries, are translated into U.S. dollars prior to consolidation. Assets and liabilities are translated at the exchange rate in effect at the balance sheet date, while income statement accounts are translated at the weighted-average monthly exchange rates. For these operations, translation gains and losses are recorded as a component of accumulated other comprehensive income (loss) in stockholders’ equity until the foreign entity is sold or liquidated. Assets and liabilities of an entity that are denominated in currencies other than an entity’s functional currency are remeasured into the functional currency using end of period exchange rates or historical rates when applicable to certain balances. Gains and losses related to these re-measurements are recorded in our consolidated statements of income as a component of “Other expense, net”.
Reclassifications and Revisions	Reclassifications— Certain prior-year amounts have been reclassified to conform to the current year presentation. Revisions— We revised our previously issued financial statements for the years ended December 31, 2018 and December 31, 2017, to correct immaterial errors related to: (i) the assessing and recording of liabilities for state sales tax and associated penalties and interest, primarily resulting in an understatement of our selling, general, and administrative expense and interest expense of $3.1 million and $2.0 million
Recently Adopted and Recently Issued Accounting Standards	Recently Adopted Accounting Standards Effective January 1, 2019, we adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2016-02, “ Leases (Topic 842). ” This update requires a lessee to recognize in the statement of financial position a right-of-use asset representing its right to use the underlying asset for the lease term and a liability for future lease payments. Similar to past guidance, the update continues to differentiate between finance leases and operating leases; however, this distinction now primarily relates to differences in the manner of expense recognition over time. Additionally, lessors will be required to classify leases as sales-type, finance or operating, with classification affecting the pattern of income recognition. Classification for both lessees and lessors is now based on an assessment of whether a lease contract is economically similar to the purchase of a non-financial asset from the perspective of control. The update also requires quantitative and qualitative disclosures to enable users to understand the amount, timing, and judgments related to leases and the related cash flows. We applied the provisions of this ASU to our lease contracts as of January 1, 2019, using the modified retrospective method of adoption. Prior period amounts have not been adjusted and continue to be reflected in accordance with our historical accounting policies. As of January 1, 2019, we recorded operating lease right-of-use assets of $27.0 million and operating lease liabilities of $27.0 million as a result of the adoption of this guidance. We have applied the following practical expedients and elections under the new standard: • We elected to utilize the package of transition practical expedients, which permitted us (i) to not reassess whether any expired or existing contracts are or contain a lease, (ii) to not reassess our historical lease classifications for existing leases, and (iii) to not reassess initial direct costs for existing leases. • For contracts in which we are a lessee, we have elected for each of our asset classes to account for each lease component and its associated non-lease components as a single lease component. • We elected to utilize the short term lease exemption for lease contracts with a term of less than 12 months. These contracts are excluded from the measurement of our right-of-use assets and lease liabilities and are recognized in earnings on a straight-line basis over their lease term. • We elected to utilize the practical expedient to exclude sales tax from the measurement of lease revenue. See Note 14—Leases for additional information related to our lease accounting. See Note 22—Cash Flow Information for additional information regarding the presentation of our leases within our consolidated statements of cash flows. Effective July 1, 2019, we adopted ASU 2018-15, “ Intangibles—Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. ” The amendments in this update align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The accounting for the service element of a hosting arrangement that is a service contract is not affected by the amendments in this update. The amendments in this update have been applied prospectively to all implementation costs incurred after the date of adoption. The impact of adopting the new standard was not material to our financial statements for the year ended December 31, 2019 . Effective December 31, 2019 we adopted ASU 2018-14, “ Compensation—Retirement Benefits—Defined Benefit Plans—General (Subtopic 715-20): Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans.” The amendment modifies certain disclosure requirements for defined benefit plans. Among other requirements and modifications, the amendment requires an explanation of the reasons for significant gains and losses related to changes in the benefit obligation for the period. The impact of adopting the new standard was not material to our financial statements for the year ended December 31, 2019 . Recently Issued Accounting Standards In June 2016, the FASB issued ASU 2016-13, “ Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments .” The update amends the impairment model to utilize an expected loss methodology in place of the currently used incurred loss methodology, which may result in earlier recognition of losses related to financial instruments. The guidance will be effective for us on January 1, 2020. We are currently evaluating the impact of this guidance and are in the process of: • collecting historical data that will be used in the calculation of expected credit losses; • documenting relevant assumptions to calculate expected losses; and • updating policies, procedures and internal controls.

Basis of Presentation and Sum_2

Basis of Presentation and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Revisions to Previously Issued Financial Statements	See the following tables for the impact of the corrections on the consolidated financial statements: Year Ended December 31, 2018 (in thousands, except per share data) As Reported Adjustments As Revised Product revenue $ 1,085,471 $ 4,747 $ 1,090,218 Other revenue (1) 131,175 (3,237 ) 127,938 Total revenue 1,216,646 1,510 1,218,156 Cost of goods and services 800,347 805 801,152 Gross profit 416,299 705 417,004 Selling, general and administrative expense 262,625 2,322 264,947 Interest expense, net 27,440 208 27,648 Other expense, net 2,943 113 3,056 Income before income taxes 123,291 (1,938 ) 121,353 Provision for income taxes 28,796 (634 ) 28,162 Net income 94,495 (1,304 ) 93,191 Net income attributable to noncontrolling interest 454 — 454 Net income attributable to Apergy $ 94,041 $ (1,304 ) $ 92,737 Earnings per share attributable to Apergy: Basic $ 1.22 $ (0.02 ) $ 1.20 Diluted $ 1.21 $ (0.02 ) $ 1.19 Comprehensive income $ 81,741 $ (1,304 ) $ 80,437 Comprehensive income attributable to Apergy $ 81,287 $ (1,304 ) $ 79,983 _______________________ (1) Includes “Service revenue” and “Lease and other revenue” as reported in the consolidated statement of income for the year ended December 31, 2018. Year Ended December 31, 2017 (in thousands, except per share data) As Reported Adjustments As Revised Product revenue $ 919,669 $ 3,023 $ 922,692 Other revenue (1) 90,797 (3,023 ) 87,774 Total revenue 1,010,466 — 1,010,466 Cost of goods and services 689,990 408 690,398 Gross profit 320,476 (408 ) 320,068 Selling, general and administrative expense 218,558 2,849 221,407 Interest expense, net 753 110 863 Other expense, net 10,377 (934 ) 9,443 Income before income taxes 90,788 (2,433 ) 88,355 Benefit from income taxes (21,876 ) (288 ) (22,164 ) Net income 112,664 (2,145 ) 110,519 Net income attributable to noncontrolling interest 930 — 930 Net income attributable to Apergy $ 111,734 $ (2,145 ) $ 109,589 Earnings per share attributable to Apergy: Basic $ 1.44 $ (0.02 ) $ 1.42 Diluted $ 1.43 $ (0.02 ) $ 1.41 Comprehensive income $ 119,905 $ (2,145 ) $ 117,760 Comprehensive income attributable to Apergy $ 118,975 $ (2,145 ) $ 116,830 _______________________ (1) Includes “Service revenue” and “Lease and other revenue” as reported in the consolidated statement of income for the year ended December 31, 2017. December 31, 2018 (in thousands) As Reported Adjustments As Revised Assets Receivables, net $ 249,948 $ 1,488 $ 251,436 Inventories, net 218,319 1,102 219,421 Prepaid expenses and other current assets 20,211 (1,677 ) 18,534 Total current assets 530,310 913 531,223 Other non-current assets 8,445 447 8,892 Total assets 1,971,756 1,360 1,973,116 Liabilities and Equity Accounts payable 131,058 9,067 140,125 Current portion of finance lease liabilities (1) — 4,320 4,320 Accrued expenses and other current liabilities (1) 30,391 (1,630 ) 28,761 Total current liabilities 201,995 11,757 213,752 Long-term debt 666,108 (2,901 ) 663,207 Deferred income taxes 101,724 (1,952 ) 99,772 Total liabilities 990,229 6,904 997,133 Stockholders’ equity: Capital in excess of par value of common stock 965,372 (4,599 ) 960,773 Retained earnings 55,829 (945 ) 54,884 Total stockholders’ equity 979,069 (5,544 ) 973,525 Total equity 981,527 (5,544 ) 975,983 Total liabilities and equity $ 1,971,756 $ 1,360 $ 1,973,116 _______________________ (1) “Current portion of finance lease liabilities” has been reclassified to a separate line consistent with the consolidated balance sheet as of December 31, 2019. (in thousands) As Reported Adjustments As Revised Total equity at December 31, 2016 $ 1,551,218 $ (2,714 ) $ 1,548,504 Net income 112,664 (2,145 ) 110,519 Net transfers to Dover (29,526 ) (17 ) (29,543 ) Total equity at December 31, 2017 1,640,385 (4,876 ) 1,635,509 Net income 94,495 (1,304 ) 93,191 Net transfers to/from Dover (742,690 ) 636 (742,054 ) Total equity at December 31, 2018 $ 981,527 $ (5,544 ) $ 975,983 Three Months Ended December 31, 2018 (in thousands, except per share data) As Reported Adjustments As Revised Total revenue $ 311,202 $ 1,931 $ 313,133 Gross profit 105,271 1,324 106,595 Net income 22,732 615 23,347 Net income attributable to Apergy $ 22,571 $ 616 $ 23,187 Earnings per share attributable to Apergy: Basic $ 0.29 $ 0.01 $ 0.30 Diluted $ 0.29 $ 0.01 $ 0.30 Three Months Ended September 30, 2019 Three Months Ended September 30, 2018 (in thousands, except per share data) As Reported Adjustments As Revised As Reported Adjustments As Revised Total revenue $ 278,381 $ (1,542 ) $ 276,839 $ 316,468 $ (297 ) $ 316,171 Gross profit 91,519 1,180 92,699 113,734 (1,407 ) 112,327 Net income 10,419 1,169 11,588 25,496 (1,481 ) 24,015 Net income attributable to Apergy $ 10,225 $ 1,169 $ 11,394 $ 25,264 $ (1,303 ) $ 23,961 Earnings per share attributable to Apergy: Basic $ 0.13 $ 0.02 $ 0.15 $ 0.33 $ (0.02 ) $ 0.31 Diluted $ 0.13 $ 0.02 $ 0.15 $ 0.33 $ (0.02 ) $ 0.31 Three Months Ended June 30, 2019 Three Months Ended June 30, 2018 (in thousands, except per share data) As Reported Adjustments As Revised As Reported Adjustments As Revised Total revenue $ 306,054 $ 116 $ 306,170 $ 305,850 $ (103 ) $ 305,747 Gross profit 109,769 (1,009 ) 108,760 103,679 411 104,090 Net income 23,850 (842 ) 23,008 22,075 (196 ) 21,879 Net income attributable to Apergy $ 23,779 $ (842 ) $ 22,937 $ 22,154 $ (338 ) $ 21,816 Earnings per share attributable to Apergy: Basic $ 0.31 $ (0.01 ) $ 0.30 $ 0.29 $ (0.01 ) $ 0.28 Diluted $ 0.31 $ (0.01 ) $ 0.30 $ 0.28 $ — $ 0.28 Three Months Ended March 31, 2019 Three Months Ended March 31, 2018 (in thousands, except per share data) As Reported Adjustments As Revised As Reported Adjustments As Revised Total revenue $ 301,691 $ (1,197 ) $ 300,494 $ 283,126 $ (21 ) $ 283,105 Gross profit 105,549 (2,538 ) 103,011 93,615 377 93,992 Net income 22,569 (2,631 ) 19,938 24,194 (244 ) 23,950 Net income attributable to Apergy $ 22,287 $ (2,631 ) $ 19,656 $ 24,052 $ (279 ) $ 23,773 Earnings per share attributable to Apergy: Basic $ 0.29 $ (0.04 ) $ 0.25 $ 0.31 $ — $ 0.31 Diluted $ 0.29 $ (0.04 ) $ 0.25 $ 0.31 $ — $ 0.31

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	A reconciliation of the number of shares used for the basic and diluted earnings per share calculation was as follows: Years Ended December 31, (in thousands, except per share data) 2019 2018 2017 Net income attributable to Apergy $ 52,164 $ 92,737 $ 109,589 Weighted-average number of shares outstanding 77,427 77,342 77,340 Dilutive effect of stock-based compensation 197 350 550 Total shares and dilutive securities 77,624 77,692 77,890 Basic earnings per share attributable to Apergy $ 0.67 $ 1.20 $ 1.42 Diluted earnings per share attributable to Apergy $ 0.67 $ 1.19 $ 1.41

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2019
Business Combinations [Abstract]
Schedule of Acquisition Date Fair Value of Consideration Transferred	The acquisition-date fair value of the consideration transferred consisted of the following: (in thousands) Cash $ 12,500 Contingent consideration (1) 1,500 Total consideration transferred $ 14,000 _______________________ (1) Contingent consideration is payable to the seller based on the acquired business exceeding a revenue target over an eighteen month period ending January 2021. Achievement of the revenue target is considered probable.
Schedule of Fair Value of Assets Acquired	The following table summarizes the final fair values of the assets acquired at the acquisition date: (in thousands) Inventory $ 1,840 Customer relationships 2,650 Technology - Technical know-how 4,000 Goodwill 5,510 Total assets acquired $ 14,000

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2019
Inventory Disclosure [Abstract]
Schedule of Inventory	Inventories consisted of the following: (in thousands) December 31, 2019 December 31, 2018 Raw materials $ 50,099 $ 53,677 Work in progress 13,325 11,416 Finished goods 175,774 180,106 239,198 245,199 LIFO and valuation adjustments (27,856 ) (25,778 ) Inventories, net $ 211,342 $ 219,421

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment	Property, plant and equipment consisted of the following: (in thousands) December 31, 2019 December 31, 2018 Land $ 13,498 $ 13,607 Buildings and improvements 107,914 105,036 Software 15,323 14,553 Machinery, equipment and other 538,168 503,476 674,903 636,672 Accumulated depreciation (426,722 ) (392,344 ) Property, plant and equipment, net $ 248,181 $ 244,328 (in thousands) Useful life December 31, 2019 Cable equipment 1 year $ 52,144 Downhole equipment 1 year 32,193 Surface equipment 5 years 69,566 Other lease equipment 3 - 5 years 16,090 169,993 Accumulated depreciation (71,968 ) Leased assets, net $ 98,025

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The carrying amount, including changes therein, of goodwill by reporting segment was as follows: (in thousands) Production & Automation Technologies Drilling Technologies Total December 31, 2017 $ 808,952 $ 101,136 $ 910,088 Purchase price adjustment (1) (53 ) — (53 ) Foreign currency translation (5,050 ) — (5,050 ) December 31, 2018 803,849 101,136 904,985 Acquisitions 5,510 — 5,510 Foreign currency translation 618 — 618 December 31, 2019 $ 809,977 $ 101,136 $ 911,113 _______________________ (1) Purchase price adjustment related to our 2017 acquisition of PCP Oil Tools S.A. and Ener Tools S.A.
Schedule of Finite-Lived Intangible Assets	The components of our definite- and indefinite-lived intangible assets were as follows: December 31, 2019 December 31, 2018 (in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Definite-lived intangible assets: Customer intangibles $ 560,316 $ 353,189 $ 207,127 $ 568,643 $ 319,827 $ 248,816 Trademarks 35,695 24,830 10,865 36,296 21,575 14,721 Patents 38,436 26,838 11,598 38,141 23,568 14,573 Unpatented technologies 13,700 9,811 3,889 9,700 9,700 — Drawings and manuals 2,558 1,758 800 3,000 2,142 858 Other 5,332 4,504 828 5,268 4,148 1,120 656,037 420,930 235,107 661,048 380,960 280,088 Indefinite-lived intangible assets: Trademarks 3,600 — 3,600 3,600 — 3,600 Total $ 659,637 $ 420,930 $ 238,707 $ 664,648 $ 380,960 $ 283,688
Schedule of Indefinite-Lived Intangible Assets	The components of our definite- and indefinite-lived intangible assets were as follows: December 31, 2019 December 31, 2018 (in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Definite-lived intangible assets: Customer intangibles $ 560,316 $ 353,189 $ 207,127 $ 568,643 $ 319,827 $ 248,816 Trademarks 35,695 24,830 10,865 36,296 21,575 14,721 Patents 38,436 26,838 11,598 38,141 23,568 14,573 Unpatented technologies 13,700 9,811 3,889 9,700 9,700 — Drawings and manuals 2,558 1,758 800 3,000 2,142 858 Other 5,332 4,504 828 5,268 4,148 1,120 656,037 420,930 235,107 661,048 380,960 280,088 Indefinite-lived intangible assets: Trademarks 3,600 — 3,600 3,600 — 3,600 Total $ 659,637 $ 420,930 $ 238,707 $ 664,648 $ 380,960 $ 283,688
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	Estimated future amortization expense related to intangible assets held as of December 31, 2019 , is as follows: (in thousands) Estimated Amortization 2020 $ 50,147 2021 49,319 2022 47,820 2023 33,928 2024 23,271

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Schedule of Debt	Long-term debt consisted of the following: (in thousands) December 31, 2019 December 31, 2018 Revolving credit facility $ — $ — Term loan facility 265,000 370,000 6.375% Senior Notes due 2026 300,000 300,000 Finance lease obligations 4,530 4,584 Total 569,530 674,584 Net unamortized discounts and issuance costs (9,709 ) (11,377 ) Total long-term debt $ 559,821 $ 663,207
Contractual Obligation, Maturity Schedule	As of December 31, 2019 , aggregate contractual future principal payments on long-term debt are as follows: (in thousands) Principal Payments ( 1) 2020 $ — 2021 — 2022 — 2023 — 2024 — Thereafter 565,000 Total $ 565,000 _______________________ (1) Principal payments included relate to our term loan facility and senior notes. See Note 14—Leases for future payments related to finance lease obligations.

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Summary of capital stock activity	The following is a summary of our capital stock activity: (in thousands) Common Stock December 31, 2017 — Issuance of common stock at the Separation 77,340 Shares issued—share-based compensation 13 December 31, 2018 77,353 Shares issued—share-based compensation 107 December 31, 2019 77,460
Schedule of accumulated other comprehensive loss	Accumulated other comprehensive loss consisted of the following: (in thousands) Foreign Currency Translation Defined Pension and Other Post-Retirement Benefits Accumulated Other Comprehensive Loss December 31, 2017 $ (21,936 ) $ (4,480 ) $ (26,416 ) Reclassification adjustment for cumulative effect of change in accounting principle — (1,315 ) (1,315 ) Net transfer from Dover — (2,421 ) (2,421 ) Other comprehensive income (loss) before reclassifications, net of tax (14,210 ) 856 (13,354 ) Reclassification adjustment for net losses included in net income, net of tax — 600 600 Other comprehensive income (loss), net of tax (14,210 ) 1,456 (12,754 ) December 31, 2018 (36,146 ) (6,760 ) (42,906 ) Other comprehensive income (loss) before reclassifications, net of tax 936 (2,711 ) (1,775 ) Reclassification adjustment for net losses included in net income, net of tax — 644 644 Other comprehensive income (loss), net of tax 936 (2,067 ) (1,131 ) December 31, 2019 $ (35,210 ) $ (8,827 ) $ (44,037 )
Reclassifications from accumulated comprehensive loss	Reclassification adjustments from accumulated other comprehensive loss to net income related to defined pension and other post-retirement benefits consisted of the following: Years Ended December 31, Affected line items on the consolidated statements of income (in thousands) 2019 2018 2017 Amortization of actuarial loss and net transition obligation (1) $ 364 $ 330 $ 397 Other expense, net Amortization of prior service cost (1) 2 1 2 Other expense, net Settlement loss (1) 508 479 — Other expense, net 874 810 399 Income before income taxes (230 ) (210 ) (141 ) Provision for (benefit from) income taxes $ 644 $ 600 $ 258 Net income _______________________ (1) These accumulated comprehensive loss components are included in the computation of net periodic benefit cost (See Note 17—Employee Benefit Plans for additional information).

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Revenue	Revenue disaggregated by revenue type was as follows: Years Ended December 31, (in thousands) 2019 2018 2017 (1) Product revenue $ 1,000,630 $ 1,090,218 $ 922,692 Service revenue 82,021 83,334 63,386 Lease and other revenue 48,600 44,604 24,388 Total revenue $ 1,131,251 $ 1,218,156 $ 1,010,466 Revenue disaggregated by end market in each of our reportable segments was as follows: Years Ended December 31, (in thousands) 2019 2018 2017 (1) Drilling Technologies $ 246,887 $ 285,565 $ 227,653 Production & Automation Technologies: Artificial lift 687,607 725,584 602,287 Digital products 134,660 119,293 82,093 Other production equipment 63,117 88,754 103,564 Intra-segment eliminations (1,020 ) (1,040 ) (5,131 ) 884,364 932,591 782,813 Total revenue $ 1,131,251 $ 1,218,156 $ 1,010,466 Revenue disaggregated by geography was as follows: Years Ended December 31, (in thousands) 2019 2018 2017 (1) United States $ 861,001 $ 959,167 $ 770,843 Canada 70,314 79,816 79,186 Middle East 60,064 53,516 48,899 Europe 51,965 38,669 28,112 Latin America 32,408 33,976 34,350 Australia 30,841 33,247 23,667 Asia-Pacific and other 24,658 19,765 25,409 Total revenue $ 1,131,251 $ 1,218,156 $ 1,010,466 _______________________ (1) Revenue for the year ended December 31, 2017 is presented in accordance with accounting standards in effect prior to our adoption of ASU No. 2014-09 on January 1, 2018.
Schedule of Contract Balances	The beginning and ending contract asset and contract liability balances from contracts with customers were as follows: (in thousands) December 31, 2019 December 31, 2018 January 1, 2018 Contract assets $ 285 $ 4,571 $ 4,733 Contract liabilities $ 6,148 $ 5,863 $ 3,912

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Schedule of Leases, Balance Sheet Information	Leases are presented in our consolidated balance sheet as follows: (in thousands) Balance Sheet Classification December 31, 2019 Right-of Use Assets: Finance leases Property, plant, and equipment, net $ 9,406 Operating leases Other non-current assets 24,289 Total lease right-of-use assets 33,695 Lease Liabilities: Finance leases - current Current portion of finance lease liabilities 4,845 Finance leases Long-term debt 4,530 Operating leases - current Accrued expenses and other current liabilities 7,620 Operating leases Other long-term liabilities 19,419 Total lease liabilities $ 36,414
Schedule of Lease Costs and Other Information	Our weighted-average remaining lease term and weighted-average discount rate for operating and finance leases are as follows: December 31, 2019 Weighted-average remaining lease term (years): Operating lease 4.6 Finance lease 2.1 Weighted-average discount rate: Operating lease 6.7 % Finance lease 5.3 % (in thousands) Year ended December 31, 2019 Finance lease cost: Amortization of right-of-use assets $ 5,200 Interest on lease liabilities 439 Operating lease cost (1) 11,191 Short-term lease cost 3,996 Variable lease cost 1,049 Sublease income (463 ) Total net lease cost $ 21,412 Supplemental cash flow information related to our lease liabilities is as follows: (in thousands) Statement of Cash Flows Classification December 31, 2019 Cash paid for amounts included in measurement of lease liabilities: Operating leases (1) Operating $ 12,026 Finance leases - interest Operating 439 Finance leases - principal Financing 5,555 Supplemental non-cash information on lease liabilities arising from obtaining right-of-use assets: Operating leases (2) Non-cash $ 38,225 Finance leases (3) Non-cash 6,412 _______________________ (1) Cash required by operating leases is reported net of operating lease expense in the operating section of our consolidated statements of cash flows in “Accrued expenses and other liabilities.” (2) Operating lease additions include lease liabilities recognized at the time of adoption. Refer to Note 2—New Accounting Standards for additional information. (3) Capital lease additions were $4.4 million and $4.6 million for the years ended December 31, 2018 and 2017, respectively.
Schedule of Future Minimum Operating Lease Payments	Future minimum payments, as determined in accordance with ASC 842, on our operating and finance leases as of December 31, 2019 are as follows: (in thousands) Operating Finance 2020 $ 9,096 $ 5,219 2021 5,939 3,488 2022 5,147 1,054 2023 4,456 155 2024 2,906 34 Thereafter 4,889 — Total future minimum lease payments 32,433 9,950 Interest included within lease payments (5,394 ) (575 ) Total lease liabilities $ 27,039 $ 9,375
Schedule of Future Minimum Financing Lease Payments	Future minimum payments, as determined in accordance with ASC 842, on our operating and finance leases as of December 31, 2019 are as follows: (in thousands) Operating Finance 2020 $ 9,096 $ 5,219 2021 5,939 3,488 2022 5,147 1,054 2023 4,456 155 2024 2,906 34 Thereafter 4,889 — Total future minimum lease payments 32,433 9,950 Interest included within lease payments (5,394 ) (575 ) Total lease liabilities $ 27,039 $ 9,375
Schedule of Leased Assets	Property, plant and equipment consisted of the following: (in thousands) December 31, 2019 December 31, 2018 Land $ 13,498 $ 13,607 Buildings and improvements 107,914 105,036 Software 15,323 14,553 Machinery, equipment and other 538,168 503,476 674,903 636,672 Accumulated depreciation (426,722 ) (392,344 ) Property, plant and equipment, net $ 248,181 $ 244,328 (in thousands) Useful life December 31, 2019 Cable equipment 1 year $ 52,144 Downhole equipment 1 year 32,193 Surface equipment 5 years 69,566 Other lease equipment 3 - 5 years 16,090 169,993 Accumulated depreciation (71,968 ) Leased assets, net $ 98,025

Restructuring (Tables)

Restructuring (Tables)	12 Months Ended
	Dec. 31, 2019
Restructuring and Related Activities [Abstract]
Restructuring and Related Costs, By Segment	We initiated various restructuring programs and incurred severance and other restructuring costs by segment as follows: Years Ended December 31, (in thousands) 2019 2018 2017 Production & Automation Technologies $ 4,467 $ 5,632 $ 6,921 Drilling Technologies 710 — — Total $ 5,177 $ 5,632 $ 6,921 Cost of goods and services $ 3,592 $ 4,693 $ 6,332 Selling, general and administrative expense 1,585 939 589 Total $ 5,177 $ 5,632 $ 6,921

Income Taxes - (Tables)

Income Taxes - (Tables)	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Domestic and foreign components of income (loss) before income taxes	Domestic and foreign components of income before income taxes were as follows: Years Ended December 31, (in thousands) 2019 2018 2017 Domestic $ 51,073 $ 104,234 $ 65,923 Foreign 8,113 17,119 22,432 Income before income tax $ 59,186 $ 121,353 $ 88,355
Provision for (benefit from) income tax	The provision for (benefit from) income taxes consisted of: Years Ended December 31, (in thousands) 2019 2018 2017 Current: U.S. federal $ 15,327 $ 24,221 $ 42,690 State and local 1,196 1,598 4,255 Foreign 4,264 4,362 6,127 Total current 20,787 30,181 53,072 Deferred: U.S. federal (12,815 ) (2,255 ) (73,544 ) State and local (1,156 ) 2,735 (1,595 ) Foreign (590 ) (2,499 ) (97 ) Total deferred (14,561 ) (2,019 ) (75,236 ) Provision for (benefit from) income taxes $ 6,226 $ 28,162 $ (22,164 )
Effective income tax rate reconciliation	The effective income tax rate was different from the statutory U.S. federal income tax rate due to the following: Years Ended December 31, 2019 2018 2017 Statutory U.S. federal income tax rate 21.0 % 21.0 % 35.0 % Net difference resulting from: State and local taxes, net of federal income tax benefit 3.2 3.4 2.1 Foreign withholding tax 1.8 0.3 — Foreign derived intangible income (0.8 ) (1.9 ) — Foreign operations tax effect — 0.3 (2.8 ) Research and experimentation tax credits (1.2 ) (0.6 ) (0.7 ) Foreign tax credit (8.0 ) (1.5 ) — Domestic manufacturing deduction — — (4.4 ) Nondeductible expenses 2.5 0.7 0.7 ESOP dividends — (0.1 ) (0.2 ) Branch income 0.6 — 1.1 Tax return to accrual adjustments (9.4 ) — — State deferred taxes (7.9 ) — — Changes due to the Tax Reform Act — — (54.3 ) Global intangible low-taxed income — 2.3 — Change in valuation allowance 9.0 — — Other (0.3 ) (0.7 ) (1.6 ) Effective income tax rate 10.5 % 23.2 % (25.1 )%
Significant components of deferred tax assets and liabilities	Significant components of deferred tax assets and liabilities were as follows: (in thousands) December 31, 2019 December 31, 2018 Deferred tax assets attributable to: Accrued compensation $ 8,725 $ 8,146 Accrued expenses, principally for state income taxes, interest and warranty 455 2,807 Net operating loss and other carryforwards 5,937 766 Inventories 1,380 — Accounts receivable, principally due to allowance for doubtful accounts 1,699 973 Long-term liabilities, principally warranty and exit cost 6,178 505 Other assets 1,202 64 Deferred tax assets 25,576 13,261 Valuation allowance (6,027 ) (722 ) Deferred tax assets, net of valuation allowance $ 19,549 $ 12,539 Deferred tax liabilities attributable to: Inventories $ — $ (2,061 ) Intangible assets, including goodwill (66,736 ) (83,436 ) Property, plant and equipment (36,873 ) (25,520 ) Deferred tax liabilities (103,609 ) (111,017 ) Net deferred tax liabilities $ (84,060 ) $ (98,478 ) Other non-current assets $ — $ 1,294 Deferred income taxes (84,060 ) (99,772 ) $ (84,060 ) $ (98,478 )

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2019
Defined Benefit Plan [Abstract]
Schedule of Benefit Obligations, Assets and Funded Status	The funded status of our benefit plans, together with the associated balances recognized in our consolidated balance sheets as of December 31, 2019 and 2018 , were as follows: Pensions Other post-retirement benefits (in thousands) 2019 2018 2019 2018 Projected benefit obligation at January 1 $ 15,948 $ 3,881 $ 13,061 $ 14,197 Service cost 760 598 — — Interest cost 588 455 503 448 Benefits paid (328 ) (370 ) (1,751 ) (1,022 ) Actuarial (gain)/loss (1) 2,784 (530 ) 1,398 (562 ) Liabilities assumed from the Separation — 14,348 — — Amendments 250 — — — Settlements and curtailments (2,156 ) (1,763 ) — — Foreign currency translation and other 503 (671 ) — — Projected benefit obligation at December 31 18,349 15,948 13,211 13,061 Fair value of plan assets at January 1 15,130 3,993 — — Actual return on plan assets 1,888 (76 ) — — Company contributions 1,486 4,740 1,751 1,022 Benefits paid (328 ) (370 ) (1,751 ) (1,022 ) Assets assumed from the Separation — 9,227 — — Settlements and curtailments (2,156 ) (1,763 ) — — Foreign currency translation and other 467 (621 ) — — Fair value of plan assets at December 31 16,487 15,130 — — Funded (unfunded) status at December 31 $ (1,862 ) $ (818 ) $ (13,211 ) $ (13,061 ) Other non-current assets $ 18 $ 146 $ — $ — Accrued compensation and employee benefits — — (1,592 ) (1,598 ) Other long-term liabilities (1,880 ) (964 ) (11,619 ) (11,463 ) Funded (unfunded) status $ (1,862 ) $ (818 ) $ (13,211 ) $ (13,061 ) Accumulated benefit obligations $ 16,235 $ 14,076 $ 13,211 $ 13,061 _______________________ (1) Actuarial losses incurred for year ended December 31, 2019 primarily relate to change in discount rate assumption utilized in estimating the projected benefit obligation.
Summary of the pre-tax amounts in accumulated other comprehensive (income) loss of net periodic benefit cost not yet recognized	The following table summarizes the pre-tax amounts in accumulated other comprehensive loss as of December 31, 2019 and 2018 that have not been recognized as components of net periodic benefit cost: Pensions Other post-retirement benefits (in thousands) 2019 2018 2019 2018 Pre-tax amounts recognized in accumulated other comprehensive loss (income): Unrecognized net actuarial loss $ 4,699 $ 3,586 $ 6,883 $ 5,685 Unrecognized prior service cost 274 25 — — Unrecognized net transition asset (10 ) (8 ) — — Accumulated other comprehensive loss $ 4,963 $ 3,603 $ 6,883 $ 5,685
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets	The following table summarizes the accumulated benefit obligations and fair values of plan assets where the accumulated benefit obligation exceeds the fair value of plan assets as of December 31, 2019 and 2018 : Pensions Other post-retirement benefits (in thousands) 2019 2018 2019 2018 Aggregate accumulated benefit obligation $ 4,108 $ 3,722 $ 13,211 $ 13,061 Aggregate fair value of plan assets 3,449 3,672 — —
Schedule of Projected Benefit Obligations in Excess of Fair Value of Plan Assets	The following table summarizes the projected benefit obligations and fair values of plan assets where the projected benefit obligation exceeds the fair value of plan assets as of December 31, 2019 and 2018 : Pensions Other post-retirement benefits (in thousands) 2019 2018 2019 2018 Aggregate projected benefit obligation $ 13,834 $ 12,334 $ 13,211 $ 13,061 Aggregate fair value of plan assets 11,954 11,370 — —
Schedule of Net Benefit Costs	Components of the net periodic benefit cost were as follows: Pensions Other post-retirement benefits (in thousands) 2019 2018 2017 2019 2018 2017 Service cost $ 760 $ 598 $ 106 $ — $ — $ — Interest cost 588 455 137 503 448 621 Expected return on plan assets (733 ) (593 ) (198 ) — — — Amortization of prior service cost 2 1 2 — — — Amortization of actuarial loss 162 127 68 200 202 330 Amortization of transition obligation 2 1 (1 ) — — — Settlement loss 508 479 — — — — Other — — — — — (1 ) Net periodic benefit cost $ 1,289 $ 1,068 $ 114 $ 703 $ 650 $ 950
Schedule of Assumptions Used in determining the Benefit Obligation	The following weighted-average assumptions were used to determine the benefit obligations: Pensions Other post-retirement benefits 2019 2018 2019 2018 Discount rate 3.11 % 3.90 % 3.00 % 4.10 % The following weighted-average assumptions were used to determine the net periodic benefit cost: Pensions Other post-retirement benefits 2019 2018 2017 2019 2018 2017 Discount rate 3.85 % 3.68 % 3.75 % 4.10 % 3.35 % 3.55 % Expected return on plan assets 4.89 % 4.80 % 5.50 %
Schedule of Allocation of Plan Assets	Refer to “Fair value measurements” in Note 1 to these consolidated financial statements for a description of the levels. Pensions December 31, 2019 December 31, 2018 (in thousands) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Mutual funds $ 5,170 $ 7,868 $ — $ 13,038 $ 4,775 $ 6,683 $ — $ 11,458 Cash and cash equivalents 3,449 — — 3,449 3,672 — — 3,672 Total $ 8,619 $ 7,868 $ — $ 16,487 $ 8,447 $ 6,683 $ — $ 15,130
Schedule of Estimated Future Benefit Payments	Actual benefit payments may differ from these expected payments. (in thousands) Pensions Other Post-retirement benefits 2020 $ 1,139 $ 1,592 2021 857 1,424 2022 941 1,295 2023 785 1,167 2024 782 1,040 2025-2029 5,427 3,557

Equity and Cash Incentive Pro_2

Equity and Cash Incentive Program (Tables)	12 Months Ended
	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Stock-based compensation expense	Stock-based compensation expense relating to all stock-based incentive plans was as follows: Years Ended December 31, 2019 2018 2017 Stock-based compensation expense $ 10,250 $ 5,375 $ 2,236 Tax benefit (2,153 ) (1,141 ) (774 ) Stock-based compensation expense, net of tax $ 8,097 $ 4,234 $ 1,462
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	the fair value of each SAR granted was estimated on the grant date using a Black-Scholes option-pricing model utilizing the following assumptions: 2017 Risk-free interest rate 1.80 % Dividend yield 2.27 % Expected life (years) 4.6 Volatility 21.90 % Grant price $ 79.28 Fair value at date of grant $ 12.63
Schedule of Share-based Compensation, SARs Outstanding Activity	A summary of activity relating to SARs outstanding for the year ended December 31, 2019 , is as follows: SARs Shares Weighted-Average Exercise Price Weighted-Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) Outstanding at January 1, 2019 477,950 $ 29.43 Forfeited / expired (7,030 ) 34.13 Exercised (48,559 ) 25.95 Outstanding at December 31, 2019 422,361 29.75 6.1 $ 1,799 Exercisable at December 31, 2019 253,901 $ 26.84 5.4 $ 1,799
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable	Other information regarding the exercise of SARs is presented below: (in thousands) 2019 2018 2017 SARs: Fair value of SARs that became exercisable $ 662 $ 310 $ 1,239 Aggregate intrinsic value of SARs exercised 629 40 2,787
Schedule of Share-based Payment Award, Performance Shares, Valuation Assumptions	The fair value used in determining stock-based compensation expense of the performance share awards issued in 2019 and 2018 is as follows: Performance shares: 2019 2018 Fair value per share at date of grant $ 57.43 $ 56.32 The fair value and average attainment used in determining stock-based compensation expense of the performance shares issued in 2017 are as follows: Performance shares: 2017 Fair value per share at date of grant $ 79.28 Average attainment rate reflected in expense 0.0 % The fair value and average attainment used in determining stock-based compensation expense of the performance shares issued in 2019 are as follows: Performance shares: 2019 Fair value per share at date of grant $ 40.22 Average attainment rate reflected in expense 100.0 %
Schedule of Share-based Compensation, Performance Shares Award, Outstanding Activity	A summary of activity for Apergy’s performance share awards for the year ended December 31, 2019 , is as follows: Shares Weighted-Average Grant-Date Fair Value Unvested at January 1, 2019 86,817 $ 56.32 Granted 92,919 48.83 Forfeited (5,010 ) 52.60 Vested — — Unvested at December 31, 2019 174,726 $ 52.44
Schedule of Share-based Compensation, Restricted Stock Units Award Activity	A summary of activity for restricted stock units for the year ended December 31, 2019 , is as follows: Shares Weighted-Average Grant-Date Fair Value Unvested at January 1, 2019 414,840 $ 41.91 Granted 183,143 37.82 Forfeited (16,498 ) 40.74 Vested (141,437 ) 39.35 Unvested at December 31, 2019 440,048 $ 41.07

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Segment revenue and operating profit	Segment revenue and segment operating profit Years Ended December 31, (in thousands) 2019 2018 2017 Segment revenue: Production & Automation Technologies $ 884,364 $ 932,591 $ 782,813 Drilling Technologies 246,887 285,565 227,653 Total revenue $ 1,131,251 $ 1,218,156 $ 1,010,466 Income before income taxes: Segment operating profit: Production & Automation Technologies $ 54,024 $ 74,187 $ 24,567 Drilling Technologies 73,497 98,620 74,317 Total segment operating profit 127,521 172,807 98,884 Corporate expense and other (1) 29,034 23,806 9,666 Interest expense, net 39,301 27,648 863 Income before income taxes $ 59,186 $ 121,353 $ 88,355 _______________________ (1) Corporate expense and other includes costs not directly attributable or allocated to our reporting segments such as corporate executive management and other administrative functions, costs related to our Separation from Dover and the results attributable to our noncontrolling interest.
Reconciliation of Assets from Segment to Consolidated	December 31, (in thousands) 2019 2018 Production & Automation Technologies $ 1,668,319 $ 1,702,396 Drilling Technologies 209,880 231,438 Corporate 44,626 39,282 Total assets $ 1,922,825 $ 1,973,116
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas	December 31, (in thousands) 2019 2018 Property, plant, and equipment, net: United States $ 238,464 $ 233,809 Middle East 2,760 3,616 Canada 5,749 6,299 Australia 789 254 Latin & South America 419 350 Total property, plant, and equipment, net $ 248,181 $ 244,328
Schedule of Segment Reporting Information, by Segment	Capital Expenditures Years Ended December 31, Depreciation & Amortization Years Ended December 31, (in thousands) 2019 2018 2017 2019 2018 2017 Production & Automation Technologies $ 30,291 $ 45,190 $ 28,483 $ 110,131 $ 112,955 $ 100,912 Drilling Technologies 9,061 11,123 8,171 9,263 11,037 11,950 Corporate 428 1,605 — 544 469 — Total $ 39,780 $ 57,918 $ 36,654 $ 119,938 $ 124,461 $ 112,862

Condensed Consolidating Finan_2

Condensed Consolidating Financial Information (Tables)	12 Months Ended
	Dec. 31, 2019
Condensed Financial Information Disclosure [Abstract]
Condensed Consolidating Income Statement	Year Ended December 31, 2019 (in thousands) Apergy Corporation Subsidiary Guarantors Subsidiary Non-guarantors Adjustments and eliminations Total Product revenue $ — $ 884,355 $ 116,275 $ — $ 1,000,630 Other revenue — 120,677 53,830 (43,886 ) 130,621 Total revenue — 1,005,032 170,105 (43,886 ) 1,131,251 Cost of goods and services — 654,440 143,962 (44,255 ) 754,147 Gross profit — 350,592 26,143 369 377,104 Selling, general and administrative expense 271 251,834 23,909 — 276,014 Interest expense, net 38,673 594 34 — 39,301 Other expense, net — 937 1,666 — 2,603 Income (loss) before income taxes and equity in earnings of affiliates (38,944 ) 97,227 534 369 59,186 Provision for (benefit from) income taxes (8,906 ) 13,934 1,122 76 6,226 Income (loss) before equity in earnings of affiliates (30,038 ) 83,293 (588 ) 293 52,960 Equity in earnings of affiliates 82,202 4,313 9,294 (95,809 ) — Net income 52,164 87,606 8,706 (95,516 ) 52,960 Net income attributable to noncontrolling interest — — 796 — 796 Net income attributable to Apergy $ 52,164 $ 87,606 $ 7,910 $ (95,516 ) $ 52,164 Comprehensive income attributable to Apergy $ 51,033 $ 86,077 $ 8,296 $ (94,373 ) $ 51,033 Year Ended December 31, 2018 (in thousands) Apergy Corporation Subsidiary Guarantors Subsidiary Non-guarantors Adjustments and eliminations Total Product revenue $ — $ 965,057 $ 125,161 $ — $ 1,090,218 Other revenue — 126,508 45,112 (43,682 ) 127,938 Total revenue — 1,091,565 170,273 (43,682 ) 1,218,156 Cost of goods and services — 696,874 147,255 (42,977 ) 801,152 Gross profit — 394,691 23,018 (705 ) 417,004 Selling, general and administrative expense 1,614 241,796 21,537 — 264,947 Interest expense, net 26,973 633 42 — 27,648 Other expense, net — 1,322 1,733 1 3,056 Income before income taxes and equity in earnings of affiliates (28,587 ) 150,940 (294 ) (706 ) 121,353 Benefit from income taxes (8,727 ) 38,395 (1,358 ) (148 ) 28,162 Income before equity in earnings of affiliates (19,860 ) 112,545 1,064 (558 ) 93,191 Equity in earnings of affiliates 112,597 25,652 45,308 (183,557 ) — Net income 92,737 138,197 46,372 (184,115 ) 93,191 Net income attributable to noncontrolling interest — — 454 — 454 Net income attributable to Apergy $ 92,737 $ 138,197 $ 45,918 $ (184,115 ) $ 92,737 Comprehensive income attributable to Apergy $ 79,983 $ 136,893 $ 34,466 $ (171,359 ) $ 79,983 Year Ended December 31, 2017 (in thousands) Apergy Corporation Subsidiary Guarantors Subsidiary Non-guarantors Adjustments and eliminations Total Product revenue $ — $ 799,337 $ 123,355 $ — $ 922,692 Other revenue — 82,725 41,152 (36,103 ) 87,774 Total revenue — 882,062 164,507 (36,103 ) 1,010,466 Cost of goods and services — 585,592 140,717 (35,911 ) 690,398 Gross profit — 296,470 23,790 (192 ) 320,068 Selling, general and administrative expense — 201,797 19,610 — 221,407 Interest expense, net — 834 29 — 863 Other expense, net — 10,169 (726 ) — 9,443 Income before income taxes and equity in loss of affiliates — 83,670 4,877 (192 ) 88,355 Benefit from income taxes — (10,510 ) (11,587 ) (67 ) (22,164 ) Income before equity in loss of affiliates — 94,180 16,464 (125 ) 110,519 Equity in earnings of affiliates 109,589 21,294 10,335 (141,218 ) — Net income 109,589 115,474 26,799 (141,343 ) 110,519 Net income attributable to noncontrolling interest — — 930 — 930 Net income attributable to Apergy $ 109,589 $ 115,474 $ 25,869 $ (141,343 ) $ 109,589 Comprehensive income attributable to Apergy $ 116,830 $ 118,354 $ 30,231 $ (148,585 ) $ 116,830
Condensed Consolidating Balance Sheet	December 31, 2019 (in thousands) Apergy Corporation Subsidiary Guarantors Subsidiary Non-guarantors Adjustments and eliminations Total Assets Cash and cash equivalents $ 108 $ 21,705 $ 13,477 $ — $ 35,290 Receivables 572 190,101 39,000 (9,799 ) 219,874 Inventories, net — 181,596 31,015 (1,269 ) 211,342 Prepaid expenses and other current assets 40 25,571 1,323 — 26,934 Total current assets 720 418,973 84,815 (11,068 ) 493,440 Property, plant and equipment, net — 236,295 11,886 — 248,181 Goodwill — 639,281 271,832 — 911,113 Advances due from affiliates 495,699 20,582 87,686 (603,967 ) — Investment in subsidiaries 1,095,712 683,003 552,386 (2,331,101 ) — Intangible assets, net — 168,711 69,996 — 238,707 Other assets 3,074 20,426 7,884 — 31,384 Total assets 1,595,205 2,187,271 1,086,485 (2,946,136 ) 1,922,825 Liabilities and Equity Accounts payable 60 102,120 27,910 (9,799 ) 120,291 Accrued compensation and employee benefits — 31,974 6,496 — 38,470 Current portion of finance lease liabilities — 4,745 100 — 4,845 Accrued expenses and other current liabilities 3,639 28,627 5,078 (1,269 ) 36,075 Total current liabilities 3,699 167,466 39,584 (11,068 ) 199,681 Advances due to affiliates — 583,386 20,581 (603,967 ) — Long-term debt 555,292 4,388 141 — 559,821 Deferred income taxes — 68,286 15,774 — 84,060 Other long-term liabilities — 36,610 6,439 — 43,049 Total liabilities 558,991 860,136 82,519 (615,035 ) 886,611 Equity: Stockholders’ capital 1,036,214 1,336,012 1,035,872 (2,331,101 ) 1,076,997 Accumulated other comprehensive loss — (8,877 ) (35,160 ) — (44,037 ) Total stockholders’ equity 1,036,214 1,327,135 1,000,712 (2,331,101 ) 1,032,960 Noncontrolling interest — — 3,254 — 3,254 Total equity 1,036,214 1,327,135 1,003,966 (2,331,101 ) 1,036,214 Total liabilities and equity $ 1,595,205 $ 2,187,271 $ 1,086,485 $ (2,946,136 ) $ 1,922,825 December 31, 2018 (in thousands) Apergy Corporation Subsidiary Guarantors Subsidiary Non-guarantors Adjustments and eliminations Total Assets Cash and cash equivalents $ 108 $ 27,533 $ 14,191 $ — $ 41,832 Receivables 1,743 231,718 35,019 (17,044 ) 251,436 Inventories, net — 190,117 30,936 (1,632 ) 219,421 Prepaid expenses and other current assets 24,583 15,387 3,106 (24,542 ) 18,534 Total current assets 26,434 464,755 83,252 (43,218 ) 531,223 Property, plant and equipment, net — 231,373 12,955 — 244,328 Goodwill — 633,771 271,214 — 904,985 Advances due from affiliates 600,802 14,185 82,889 (697,876 ) — Investment in subsidiaries 1,008,325 682,545 540,622 (2,231,492 ) — Intangible assets, net — 198,531 85,157 — 283,688 Other assets 3,996 2,818 2,078 — 8,892 Total assets 1,639,557 2,227,978 1,078,167 (2,972,586 ) 1,973,116 Liabilities and Equity Accounts payable 22 123,812 33,335 (17,044 ) 140,125 Accrued compensation and employee benefits — 35,278 5,268 — 40,546 Current portion of finance lease liabilities — 4,320 — — 4,320 Accrued expenses and other current liabilities 4,929 46,458 3,548 (26,174 ) 28,761 Total current liabilities 4,951 209,868 42,151 (43,218 ) 213,752 Intercompany notes payable — 683,700 14,176 (697,876 ) — Long-term debt 658,623 4,462 122 — 663,207 Deferred income taxes — 79,344 20,428 — 99,772 Other long-term liabilities — 19,441 961 — 20,402 Total liabilities 663,574 996,815 77,838 (741,094 ) 997,133 Equity: Stockholders’ capital 975,983 1,238,517 1,033,423 (2,231,492 ) 1,016,431 Accumulated other comprehensive loss — (7,354 ) (35,552 ) — (42,906 ) Total stockholders’ equity 975,983 1,231,163 997,871 (2,231,492 ) 973,525 Noncontrolling interest — — 2,458 — 2,458 Total equity 975,983 1,231,163 1,000,329 (2,231,492 ) 975,983 Total liabilities and equity $ 1,639,557 $ 2,227,978 $ 1,078,167 $ (2,972,586 ) $ 1,973,116
Condensed Consolidating Cash Flow Statement	Year Ended December 31, 2019 (in thousands) Apergy Corporation Subsidiary Guarantors Subsidiary Non-guarantors Adjustments and eliminations Total Cash provided (required) by operating activities $ (48,970 ) $ 204,877 $ (8 ) $ — $ 155,899 Cash provided (required) by investing activities: Capital expenditures — (37,725 ) (2,055 ) — (39,780 ) Proceeds from sale of property, plant and equipment — 4,580 18 — 4,598 Payment on sale of business — (2,194 ) — — (2,194 ) Acquisitions — (12,500 ) — — (12,500 ) Net cash required by investing activities — (47,839 ) (2,037 ) — (49,876 ) Cash provided (required) by financing activities: Proceeds from long-term debt, net of discounts 36,500 — — — 36,500 Repayment of long-term debt (141,500 ) — — — (141,500 ) Advances due to (from) affiliates 153,970 (155,578 ) 1,608 — — Payments on capital lease obligations — (5,493 ) (62 ) — (5,555 ) Payments related to taxes withheld on stock-based — (1,795 ) (53 ) — (1,848 ) Net cash provided (required) by financing activities 48,970 (162,866 ) 1,493 — (112,403 ) Effect of exchange rate changes on cash and cash equivalents — — (162 ) — (162 ) Net (increase) decrease in cash and cash equivalents — (5,828 ) (714 ) — (6,542 ) Cash and cash equivalents at beginning of period 108 27,533 14,191 — 41,832 Cash and cash equivalents at end of period $ 108 $ 21,705 $ 13,477 $ — $ 35,290 Year Ended December 31, 2018 (in thousands) Apergy Corporation Subsidiary Guarantors Subsidiary Non-guarantors Adjustments and eliminations Total Cash provided (required) by operating activities $ (51,728 ) $ 200,907 $ 15,720 $ (999 ) $ 163,900 Cash provided (required) by investing activities: Capital expenditures — (55,070 ) (2,848 ) — (57,918 ) Proceeds from sale of property, plant and equipment — 1,127 60 — 1,187 Proceeds from the sale of businesses — 2,473 — — 2,473 Purchase price adjustments on acquisition — — 53 — 53 Net cash required by investing activities — (51,470 ) (2,735 ) — (54,205 ) Cash provided (required) by financing activities: Proceeds from long-term debt, net of discounts 713,963 — — — 713,963 Payment of debt issue costs (16,006 ) — — — (16,006 ) Repayment of long-term debt (45,000 ) — — — (45,000 ) Advances due to (from) affiliates (600,802 ) 621,109 (20,307 ) — — Distributions to Dover Corporation, net (319 ) (744,258 ) 7,021 999 (736,557 ) Distribution to noncontrolling interest — — (2,720 ) — (2,720 ) Payments on capital lease obligations — (4,518 ) — — (4,518 ) Net cash provided (required) by financing activities 51,836 (127,667 ) (16,006 ) 999 (90,838 ) Effect of exchange rate changes on cash and cash equivalents — — (737 ) — (737 ) Net increase (decrease) in cash and cash equivalents 108 21,770 (3,758 ) — 18,120 Cash and cash equivalents at beginning of period — 5,763 17,949 — 23,712 Cash and cash equivalents at end of period $ 108 $ 27,533 $ 14,191 $ — $ 41,832 Year Ended December 31, 2017 (in thousands) Apergy Corporation Subsidiary Guarantors Subsidiary Non-guarantors Adjustments and eliminations Total Cash provided by operating activities $ — $ 64,422 $ 11,561 $ 67 $ 76,050 Cash provided (required) by investing activities: Capital expenditures — (35,008 ) (1,646 ) — (36,654 ) Acquisitions, net of cash and cash equivalents acquired — — (8,842 ) — (8,842 ) Proceeds from sale of property, plant and equipment — 3,433 114 — 3,547 Net cash required by investing activities — (31,575 ) (10,374 ) — (41,949 ) Cash provided (required) by financing activities: Change in borrowings, net — — (599 ) — (599 ) Distributions to Dover Corporation, net — (27,124 ) (4,001 ) (67 ) (31,192 ) Distribution to noncontrolling interest — — (1,212 ) — (1,212 ) Payments of capital lease obligations — (3,690 ) — — (3,690 ) Net cash required by financing activities — (30,814 ) (5,812 ) (67 ) (36,693 ) Effect of exchange rate changes on cash and cash equivalents — — 277 — 277 Net increase in cash and cash equivalents — 2,033 (4,348 ) — (2,315 ) Cash and cash equivalents at beginning of period — 3,730 22,297 — 26,027 Cash and cash equivalents at end of period $ — $ 5,763 $ 17,949 $ — $ 23,712

Cash Flow Information (Tables)

Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Cash and Non-cash Supplemental Information	Cash payments for income taxes and cash payments for interest incurred related to our debt are as follows: Years Ended December 31, (in thousands) 2019 2018 2017 Cash information: Cash paid for income taxes $ 26,464 $ 27,191 $ 8,698 Cash paid for interest 36,085 21,899 —
Schedule of Supplemental Cash Flow Information Related to Leases	Our weighted-average remaining lease term and weighted-average discount rate for operating and finance leases are as follows: December 31, 2019 Weighted-average remaining lease term (years): Operating lease 4.6 Finance lease 2.1 Weighted-average discount rate: Operating lease 6.7 % Finance lease 5.3 % (in thousands) Year ended December 31, 2019 Finance lease cost: Amortization of right-of-use assets $ 5,200 Interest on lease liabilities 439 Operating lease cost (1) 11,191 Short-term lease cost 3,996 Variable lease cost 1,049 Sublease income (463 ) Total net lease cost $ 21,412 Supplemental cash flow information related to our lease liabilities is as follows: (in thousands) Statement of Cash Flows Classification December 31, 2019 Cash paid for amounts included in measurement of lease liabilities: Operating leases (1) Operating $ 12,026 Finance leases - interest Operating 439 Finance leases - principal Financing 5,555 Supplemental non-cash information on lease liabilities arising from obtaining right-of-use assets: Operating leases (2) Non-cash $ 38,225 Finance leases (3) Non-cash 6,412 _______________________ (1) Cash required by operating leases is reported net of operating lease expense in the operating section of our consolidated statements of cash flows in “Accrued expenses and other liabilities.” (2) Operating lease additions include lease liabilities recognized at the time of adoption. Refer to Note 2—New Accounting Standards for additional information. (3) Capital lease additions were $4.4 million and $4.6 million for the years ended December 31, 2018 and 2017, respectively.

Selected Quarterly Financial _2

Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information	2019 2018 (in thousands, except per share data) 4th Qtr. 3rd Qtr. 2nd Qtr. 1st Qtr. 4th Qtr. 3rd Qtr. 2nd Qtr. 1st Qtr. Revenue $ 247,748 $ 276,839 $ 306,170 $ 300,494 $ 313,133 $ 316,171 $ 305,747 $ 283,105 Gross profit 72,634 92,699 108,760 103,011 106,595 112,327 104,090 93,992 Net income (loss) (1,574 ) 11,588 23,008 19,938 23,347 24,015 21,879 23,950 Net income (loss) attributable to Apergy (1,823 ) 11,394 22,937 19,656 23,187 23,961 21,816 23,773 Basic earnings (loss) per share (1) $ (0.02 ) $ 0.15 $ 0.30 $ 0.25 $ 0.30 $ 0.31 $ 0.28 $ 0.31 Diluted earnings (loss) per share (1) $ (0.02 ) $ 0.15 $ 0.30 $ 0.25 $ 0.30 $ 0.31 $ 0.28 $ 0.31 _______________________ (1) On May 9, 2018, 77,339,828 shares of our common stock were distributed to Dover stockholders in conjunction with the Separation. For comparative purposes, we have assumed the shares issued in conjunction with the Separation to be outstanding as of the beginning of each period prior to the Separation. In addition, we have assumed the potential dilutive securities outstanding as of May 8, 2018, were outstanding and fully dilutive in each of the periods with positive income prior to Separation.
Schedule of Revisions to Previously Issued Financial Statements	See the following tables for the impact of the corrections on the consolidated financial statements: Year Ended December 31, 2018 (in thousands, except per share data) As Reported Adjustments As Revised Product revenue $ 1,085,471 $ 4,747 $ 1,090,218 Other revenue (1) 131,175 (3,237 ) 127,938 Total revenue 1,216,646 1,510 1,218,156 Cost of goods and services 800,347 805 801,152 Gross profit 416,299 705 417,004 Selling, general and administrative expense 262,625 2,322 264,947 Interest expense, net 27,440 208 27,648 Other expense, net 2,943 113 3,056 Income before income taxes 123,291 (1,938 ) 121,353 Provision for income taxes 28,796 (634 ) 28,162 Net income 94,495 (1,304 ) 93,191 Net income attributable to noncontrolling interest 454 — 454 Net income attributable to Apergy $ 94,041 $ (1,304 ) $ 92,737 Earnings per share attributable to Apergy: Basic $ 1.22 $ (0.02 ) $ 1.20 Diluted $ 1.21 $ (0.02 ) $ 1.19 Comprehensive income $ 81,741 $ (1,304 ) $ 80,437 Comprehensive income attributable to Apergy $ 81,287 $ (1,304 ) $ 79,983 _______________________ (1) Includes “Service revenue” and “Lease and other revenue” as reported in the consolidated statement of income for the year ended December 31, 2018. Year Ended December 31, 2017 (in thousands, except per share data) As Reported Adjustments As Revised Product revenue $ 919,669 $ 3,023 $ 922,692 Other revenue (1) 90,797 (3,023 ) 87,774 Total revenue 1,010,466 — 1,010,466 Cost of goods and services 689,990 408 690,398 Gross profit 320,476 (408 ) 320,068 Selling, general and administrative expense 218,558 2,849 221,407 Interest expense, net 753 110 863 Other expense, net 10,377 (934 ) 9,443 Income before income taxes 90,788 (2,433 ) 88,355 Benefit from income taxes (21,876 ) (288 ) (22,164 ) Net income 112,664 (2,145 ) 110,519 Net income attributable to noncontrolling interest 930 — 930 Net income attributable to Apergy $ 111,734 $ (2,145 ) $ 109,589 Earnings per share attributable to Apergy: Basic $ 1.44 $ (0.02 ) $ 1.42 Diluted $ 1.43 $ (0.02 ) $ 1.41 Comprehensive income $ 119,905 $ (2,145 ) $ 117,760 Comprehensive income attributable to Apergy $ 118,975 $ (2,145 ) $ 116,830 _______________________ (1) Includes “Service revenue” and “Lease and other revenue” as reported in the consolidated statement of income for the year ended December 31, 2017. December 31, 2018 (in thousands) As Reported Adjustments As Revised Assets Receivables, net $ 249,948 $ 1,488 $ 251,436 Inventories, net 218,319 1,102 219,421 Prepaid expenses and other current assets 20,211 (1,677 ) 18,534 Total current assets 530,310 913 531,223 Other non-current assets 8,445 447 8,892 Total assets 1,971,756 1,360 1,973,116 Liabilities and Equity Accounts payable 131,058 9,067 140,125 Current portion of finance lease liabilities (1) — 4,320 4,320 Accrued expenses and other current liabilities (1) 30,391 (1,630 ) 28,761 Total current liabilities 201,995 11,757 213,752 Long-term debt 666,108 (2,901 ) 663,207 Deferred income taxes 101,724 (1,952 ) 99,772 Total liabilities 990,229 6,904 997,133 Stockholders’ equity: Capital in excess of par value of common stock 965,372 (4,599 ) 960,773 Retained earnings 55,829 (945 ) 54,884 Total stockholders’ equity 979,069 (5,544 ) 973,525 Total equity 981,527 (5,544 ) 975,983 Total liabilities and equity $ 1,971,756 $ 1,360 $ 1,973,116 _______________________ (1) “Current portion of finance lease liabilities” has been reclassified to a separate line consistent with the consolidated balance sheet as of December 31, 2019. (in thousands) As Reported Adjustments As Revised Total equity at December 31, 2016 $ 1,551,218 $ (2,714 ) $ 1,548,504 Net income 112,664 (2,145 ) 110,519 Net transfers to Dover (29,526 ) (17 ) (29,543 ) Total equity at December 31, 2017 1,640,385 (4,876 ) 1,635,509 Net income 94,495 (1,304 ) 93,191 Net transfers to/from Dover (742,690 ) 636 (742,054 ) Total equity at December 31, 2018 $ 981,527 $ (5,544 ) $ 975,983 Three Months Ended December 31, 2018 (in thousands, except per share data) As Reported Adjustments As Revised Total revenue $ 311,202 $ 1,931 $ 313,133 Gross profit 105,271 1,324 106,595 Net income 22,732 615 23,347 Net income attributable to Apergy $ 22,571 $ 616 $ 23,187 Earnings per share attributable to Apergy: Basic $ 0.29 $ 0.01 $ 0.30 Diluted $ 0.29 $ 0.01 $ 0.30 Three Months Ended September 30, 2019 Three Months Ended September 30, 2018 (in thousands, except per share data) As Reported Adjustments As Revised As Reported Adjustments As Revised Total revenue $ 278,381 $ (1,542 ) $ 276,839 $ 316,468 $ (297 ) $ 316,171 Gross profit 91,519 1,180 92,699 113,734 (1,407 ) 112,327 Net income 10,419 1,169 11,588 25,496 (1,481 ) 24,015 Net income attributable to Apergy $ 10,225 $ 1,169 $ 11,394 $ 25,264 $ (1,303 ) $ 23,961 Earnings per share attributable to Apergy: Basic $ 0.13 $ 0.02 $ 0.15 $ 0.33 $ (0.02 ) $ 0.31 Diluted $ 0.13 $ 0.02 $ 0.15 $ 0.33 $ (0.02 ) $ 0.31 Three Months Ended June 30, 2019 Three Months Ended June 30, 2018 (in thousands, except per share data) As Reported Adjustments As Revised As Reported Adjustments As Revised Total revenue $ 306,054 $ 116 $ 306,170 $ 305,850 $ (103 ) $ 305,747 Gross profit 109,769 (1,009 ) 108,760 103,679 411 104,090 Net income 23,850 (842 ) 23,008 22,075 (196 ) 21,879 Net income attributable to Apergy $ 23,779 $ (842 ) $ 22,937 $ 22,154 $ (338 ) $ 21,816 Earnings per share attributable to Apergy: Basic $ 0.31 $ (0.01 ) $ 0.30 $ 0.29 $ (0.01 ) $ 0.28 Diluted $ 0.31 $ (0.01 ) $ 0.30 $ 0.28 $ — $ 0.28 Three Months Ended March 31, 2019 Three Months Ended March 31, 2018 (in thousands, except per share data) As Reported Adjustments As Revised As Reported Adjustments As Revised Total revenue $ 301,691 $ (1,197 ) $ 300,494 $ 283,126 $ (21 ) $ 283,105 Gross profit 105,549 (2,538 ) 103,011 93,615 377 93,992 Net income 22,569 (2,631 ) 19,938 24,194 (244 ) 23,950 Net income attributable to Apergy $ 22,287 $ (2,631 ) $ 19,656 $ 24,052 $ (279 ) $ 23,773 Earnings per share attributable to Apergy: Basic $ 0.29 $ (0.04 ) $ 0.25 $ 0.31 $ — $ 0.31 Diluted $ 0.29 $ (0.04 ) $ 0.25 $ 0.31 $ — $ 0.31

Basis of Presentation and Sum_3

Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) $ / shares in Units, $ in Thousands

May 09, 2018

Dec. 31, 2019USD ($)

Sep. 30, 2019USD ($)

Jun. 30, 2019USD ($)

Mar. 31, 2019USD ($)

Dec. 31, 2018USD ($)

Sep. 30, 2018USD ($)

Jun. 30, 2018USD ($)

Mar. 31, 2018USD ($)

Dec. 31, 2019USD ($)$ / shares

Dec. 31, 2018USD ($)

Dec. 31, 2017USD ($)

Property, Plant and Equipment [Line Items]

Conversion ratio

0.5

Research and development expense

$ 12,900

$ 16,000

$ 18,500

Reduction in depreciation

(68,557)

(72,569)

(59,161)

Net income (loss) attributable to Apergy

$ (1,823)

$ 11,394

$ 22,937

$ 19,656

$ 23,187

$ 23,961

$ 21,816

$ 23,773

$ 52,164

92,737

109,589

Minimum | Building and improvements

Property, Plant and Equipment [Line Items]

Useful life

5 years

Minimum | Machinery and equipment

Property, Plant and Equipment [Line Items]

Useful life

1 year

Minimum | Software

Property, Plant and Equipment [Line Items]

Useful life

3 years

Minimum | Other intangible assets

Property, Plant and Equipment [Line Items]

Finite-lived intangible asset, useful life (in years)

5 years

Maximum | Building and improvements

Property, Plant and Equipment [Line Items]

Useful life

31 years 6 months

Maximum | Machinery and equipment

Property, Plant and Equipment [Line Items]

Useful life

7 years

Maximum | Software

Property, Plant and Equipment [Line Items]

Useful life

10 years

Maximum | Other intangible assets

Property, Plant and Equipment [Line Items]

Finite-lived intangible asset, useful life (in years)

15 years

Adjustments

Property, Plant and Equipment [Line Items]

Net income (loss) attributable to Apergy

1,169

(842)

(2,631)

616

(1,303)

(338)

(279)

(1,304)

(2,145)

Selling, general, administrative and interest expense

3,100

2,000

As Reported

Property, Plant and Equipment [Line Items]

Net income (loss) attributable to Apergy

$ 10,225

$ 23,779

$ 22,287

$ 22,571

$ 25,264

$ 22,154

$ 24,052

$ 94,041

$ 111,734

Service Life

Property, Plant and Equipment [Line Items]

Reduction in depreciation

$ 8,800

Net income (loss) attributable to Apergy

$ 6,700

Earnings per share, basic and diluted (in dollars per share) | $ / shares

$ 0.09

Production & Automation Technologies | Service Life

Property, Plant and Equipment [Line Items]

Useful life

5 years

3 years

Basis of Presentation and Sum_4

Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Revisions to Previously Issued Income Statements (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	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, 2019		Dec. 31, 2018		Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue	$ 247,748	$ 276,839	$ 306,170	$ 300,494	$ 313,133	$ 316,171	$ 305,747	$ 283,105	$ 1,131,251		$ 1,218,156		$ 1,010,466
Cost of goods and services									754,147		801,152		690,398
Gross profit	72,634	92,699	108,760	103,011	106,595	112,327	104,090	93,992	377,104		417,004		320,068
Selling, general and administrative expense									276,014		264,947		221,407
Interest expense, net									39,301		27,648		863
Other expense, net									2,603		3,056		9,443
Income before income taxes									59,186		121,353		88,355
Provision for (benefit from) income taxes									6,226		28,162		(22,164)
Net income	(1,574)	11,588	23,008	19,938	23,347	24,015	21,879	23,950	52,960		93,191		110,519
Net income attributable to noncontrolling interest									796		454		930
Net income attributable to Apergy	$ (1,823)	$ 11,394	$ 22,937	$ 19,656	$ 23,187	$ 23,961	$ 21,816	$ 23,773	$ 52,164		$ 92,737		$ 109,589
Earnings per share attributable to Apergy:
Basic (in dollars per share)	$ (0.02)	$ 0.15	$ 0.30	$ 0.25	$ 0.30	$ 0.31	$ 0.28	$ 0.31	$ 0.67	[1]	$ 1.20	[1]	$ 1.42	[1]
Diluted (in dollars per share)	$ (0.02)	$ 0.15	$ 0.30	$ 0.25	$ 0.30	$ 0.31	$ 0.28	$ 0.31	$ 0.67	[1]	$ 1.19	[1]	$ 1.41	[1]
Comprehensive income									$ 51,829		$ 80,437		$ 117,760
Comprehensive income attributable to Apergy									51,033		79,983		116,830
Product revenue
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue									1,000,630		1,090,218		922,692
Other revenue
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue									$ 130,621		127,938		87,774
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue		$ 278,381	$ 306,054	$ 301,691	$ 311,202	$ 316,468	$ 305,850	$ 283,126			1,216,646		1,010,466
Cost of goods and services											800,347		689,990
Gross profit		91,519	109,769	105,549	105,271	113,734	103,679	93,615			416,299		320,476
Selling, general and administrative expense											262,625		218,558
Interest expense, net											27,440		753
Other expense, net											2,943		10,377
Income before income taxes											123,291		90,788
Provision for (benefit from) income taxes											28,796		(21,876)
Net income		10,419	23,850	22,569	22,732	25,496	22,075	24,194			94,495		112,664
Net income attributable to noncontrolling interest											454		930
Net income attributable to Apergy		$ 10,225	$ 23,779	$ 22,287	$ 22,571	$ 25,264	$ 22,154	$ 24,052			$ 94,041		$ 111,734
Earnings per share attributable to Apergy:
Basic (in dollars per share)		$ 0.13	$ 0.31	$ 0.29	$ 0.29	$ 0.33	$ 0.29	$ 0.31			$ 1.22		$ 1.44
Diluted (in dollars per share)		$ 0.13	$ 0.31	$ 0.29	$ 0.29	$ 0.33	$ 0.28	$ 0.31			$ 1.21		$ 1.43
Comprehensive income											$ 81,741		$ 119,905
Comprehensive income attributable to Apergy											81,287		118,975
As Reported | Product revenue
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue											1,085,471		919,669
As Reported | Other revenue
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue											131,175		90,797
Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue		$ (1,542)	$ 116	$ (1,197)	$ 1,931	$ (297)	$ (103)	$ (21)			1,510		0
Cost of goods and services											805		408
Gross profit		1,180	(1,009)	(2,538)	1,324	(1,407)	411	377			705		(408)
Selling, general and administrative expense											2,322		2,849
Interest expense, net											208		110
Other expense, net											113		(934)
Income before income taxes											(1,938)		(2,433)
Provision for (benefit from) income taxes											(634)		(288)
Net income		1,169	(842)	(2,631)	615	(1,481)	(196)	(244)			(1,304)		(2,145)
Net income attributable to noncontrolling interest											0		0
Net income attributable to Apergy		$ 1,169	$ (842)	$ (2,631)	$ 616	$ (1,303)	$ (338)	$ (279)			$ (1,304)		$ (2,145)
Earnings per share attributable to Apergy:
Basic (in dollars per share)		$ 0.02	$ (0.01)	$ (0.04)	$ 0.01	$ (0.02)	$ (0.01)	$ 0			$ (0.02)		$ (0.02)
Diluted (in dollars per share)		$ 0.02	$ (0.01)	$ (0.04)	$ 0.01	$ (0.02)	$ 0	$ 0			$ (0.02)		$ (0.02)
Comprehensive income											$ (1,304)		$ (2,145)
Comprehensive income attributable to Apergy											(1,304)		(2,145)
Adjustments | Product revenue
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue											4,747		3,023
Adjustments | Other revenue
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue											$ (3,237)		$ (3,023)
[1]	See Note 4—Earnings Per Share .

Basis of Presentation and Sum_5

Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Revisions to Previously Issued Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets
Receivables, net	$ 219,874	$ 251,436
Inventories, net	211,342	219,421
Prepaid expenses and other current assets	26,934	18,534
Total current assets	493,440	531,223
Other non-current assets	31,384	8,892
Total assets	1,922,825	1,973,116
Liabilities and Equity
Accounts payable	120,291	140,125
Current portion of finance lease liabilities		4,320
Accrued expenses and other current liabilities	36,075	28,761
Total current liabilities	199,681	213,752
Long-term debt	559,821	663,207
Deferred income taxes	84,060	99,772
Total liabilities	886,611	997,133
Stockholders’ equity:
Capital in excess of par value of common stock	969,174	960,773
Retained earnings	107,048	54,884
Total stockholders’ equity	1,032,960	973,525
Noncontrolling interest	3,254	2,458
Total equity	1,036,214	975,983	$ 1,635,509	$ 1,548,504
Total liabilities and equity	$ 1,922,825	1,973,116
As Reported
Assets
Receivables, net		249,948
Inventories, net		218,319
Prepaid expenses and other current assets		20,211
Total current assets		530,310
Other non-current assets		8,445
Total assets		1,971,756
Liabilities and Equity
Accounts payable		131,058
Current portion of finance lease liabilities		0
Accrued expenses and other current liabilities		30,391
Total current liabilities		201,995
Long-term debt		666,108
Deferred income taxes		101,724
Total liabilities		990,229
Stockholders’ equity:
Capital in excess of par value of common stock		965,372
Retained earnings		55,829
Total stockholders’ equity		979,069
Total equity		981,527	1,640,385	1,551,218
Total liabilities and equity		1,971,756
Adjustments
Assets
Receivables, net		1,488
Inventories, net		1,102
Prepaid expenses and other current assets		(1,677)
Total current assets		913
Other non-current assets		447
Total assets		1,360
Liabilities and Equity
Accounts payable		9,067
Current portion of finance lease liabilities		4,320
Accrued expenses and other current liabilities		(1,630)
Total current liabilities		11,757
Long-term debt		(2,901)
Deferred income taxes		(1,952)
Total liabilities		6,904
Stockholders’ equity:
Capital in excess of par value of common stock		(4,599)
Retained earnings		(945)
Total stockholders’ equity		(5,544)
Total equity		(5,544)	$ (4,876)	$ (2,714)
Total liabilities and equity		$ 1,360

Basis of Presentation and Sum_6

Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Revisions to Summarized Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	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, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total equity	$ 1,036,214				$ 975,983				$ 1,036,214	$ 975,983	$ 1,635,509	$ 1,548,504
Net income	$ (1,574)	$ 11,588	$ 23,008	$ 19,938	23,347	$ 24,015	$ 21,879	$ 23,950	$ 52,960	93,191	110,519
Net transfers to/from Dover										(742,054)	(29,543)
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total equity					981,527					981,527	1,640,385	1,551,218
Net income		10,419	23,850	22,569	22,732	25,496	22,075	24,194		94,495	112,664
Net transfers to/from Dover										(742,690)	(29,526)
Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total equity					(5,544)					(5,544)	(4,876)	$ (2,714)
Net income		$ 1,169	$ (842)	$ (2,631)	$ 615	$ (1,481)	$ (196)	$ (244)		(1,304)	(2,145)
Net transfers to/from Dover										$ 636	$ (17)

New Accounting Standards - Narr

New Accounting Standards - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset	$ 24,289
Operating lease liabilities	$ 27,039
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset		$ 27,000
Operating lease liabilities		$ 27,000

Related Party Transactions - Na

Related Party Transactions - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Related party transaction, selling, general and administrative expenses from transactions with related party	$ 7,400	$ 23,000
Payments of ordinary dividends, noncontrolling interest	$ 0	2,720	$ 1,212
Non- controlling Interest
Related Party Transaction [Line Items]
Related party transaction, commission rate	5.00%
Royalty Agreements
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party		$ 2,300	$ 9,800

Earnings Per Share - Narrative

Earnings Per Share - Narrative (Details)	May 09, 2018shares
Earnings Per Share [Abstract]
Issuance of common stock at the Separation (in shares)	77,339,828

Earnings Per Share - Reconcilia

Earnings Per Share - Reconciliation of the number of shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended								12 Months Ended
		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, 2019		Dec. 31, 2018		Dec. 31, 2017
Earnings Per Share [Abstract]
Net income attributable to Apergy		$ (1,823)	$ 11,394	$ 22,937	$ 19,656	$ 23,187	$ 23,961	$ 21,816	$ 23,773	$ 52,164		$ 92,737		$ 109,589
Weighted-average number of shares outstanding (in shares)	[1]									77,427		77,342		77,340
Dilutive effect of stock-based compensation (in shares)										197		350		550
Total shares and dilutive securities (in shares)	[1]									77,624		77,692		77,890
Basic earnings per share attributable to Apergy (in dollars per share)		$ (0.02)	$ 0.15	$ 0.30	$ 0.25	$ 0.30	$ 0.31	$ 0.28	$ 0.31	$ 0.67	[1]	$ 1.20	[1]	$ 1.42	[1]
Diluted earnings per share attributable to Apergy (in dollars per share)		$ (0.02)	$ 0.15	$ 0.30	$ 0.25	$ 0.30	$ 0.31	$ 0.28	$ 0.31	$ 0.67	[1]	$ 1.19	[1]	$ 1.41	[1]
[1]	See Note 4—Earnings Per Share .

Acquisitions - Schedule of Busi

Acquisitions - Schedule of Business Acquisitions (Details) - USD ($) $ in Thousands	Jul. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Combinations [Abstract]
Cash consideration	$ 12,500
Contingent consideration	1,500
Total consideration transferred	14,000
Acquired Finite-Lived Intangible Assets [Line Items]
Inventory	1,840
Goodwill	5,510	$ 911,113	$ 904,985	$ 910,088
Total assets acquired	14,000
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	2,650
Technology - Technical know-how
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 4,000

Acquisitions - Narrative (Detai

Acquisitions - Narrative (Details) - USD ($) $ in Thousands	Jul. 31, 2019	Oct. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Contingent consideration revenue target period	18 months
Payments to acquire businesses, net of cash acquired			$ 12,500	$ 0	$ 8,842
Goodwill	$ 5,510		$ 911,113	$ 904,985	$ 910,088
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization period for acquired intangibles	15 years
PCP Tools
Acquired Finite-Lived Intangible Assets [Line Items]
Ownership percentage		100.00%
Payments to acquire businesses, net of cash acquired		$ 8,800
Goodwill		5,100
Business combination, intangible assets		$ 4,500
Finite-lived intangible asset, useful life (in years)		9 years

Dispositions (Details)

Dispositions (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jun. 30, 2019	Oct. 31, 2018	Dec. 31, 2019
Dispositions [Abstract]
Impairment of held-for-sale assets			$ 1,700
Payment on sale of business	$ 2,200		2,194
Loss on sale of business		$ (1,300)	$ 2,500

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Raw materials	$ 50,099	$ 53,677
Work in progress	13,325	11,416
Finished goods	175,774	180,106
Inventory, gross	239,198	245,199
LIFO and valuation adjustments	(27,856)	(25,778)
Inventories, net	$ 211,342	$ 219,421
Percentage of LIFO inventory	23.00%	24.00%
Excess of replacement or current costs over stated LIFO value	$ 15,800	$ 12,900

Property, Plant and Equipment -

Property, Plant and Equipment - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Depreciation	$ 68,557	$ 72,569	$ 59,161

Property, Plant and Equipment_2

Property, Plant and Equipment - PPE (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 674,903	$ 636,672
Accumulated depreciation	(426,722)	(392,344)
Property, plant and equipment, net	248,181	244,328
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	13,498	13,607
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	107,914	105,036
Software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	15,323	14,553
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 538,168	$ 503,476

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 904,985	$ 910,088
Purchase price adjustment		(53)
Foreign currency translation	618	(5,050)
Acquisitions	5,510
Goodwill, end of period	911,113	904,985
Production & Automation Technologies
Goodwill [Roll Forward]
Goodwill, beginning of period	803,849	808,952
Purchase price adjustment		(53)
Foreign currency translation	618	(5,050)
Acquisitions	5,510
Goodwill, end of period	809,977	803,849
Drilling Technologies
Goodwill [Roll Forward]
Goodwill, beginning of period	101,136	101,136
Purchase price adjustment		0
Foreign currency translation	0	0
Acquisitions	0
Goodwill, end of period	$ 101,136	$ 101,136

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, acquired during period	$ 5,510
Intangible assets acquired	6,700
Amortization of intangible assets	$ 51,400	$ 51,900	$ 53,700

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Intangible Assets and Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 656,037	$ 661,048
Accumulated Amortization	420,930	380,960
Net Carrying Amount	235,107	280,088
Intangible assets, gross	659,637	664,648
Intangible assets, net	238,707	283,688
Trademarks
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	3,600	3,600
Customer intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	560,316	568,643
Accumulated Amortization	353,189	319,827
Net Carrying Amount	207,127	248,816
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	35,695	36,296
Accumulated Amortization	24,830	21,575
Net Carrying Amount	10,865	14,721
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	38,436	38,141
Accumulated Amortization	26,838	23,568
Net Carrying Amount	11,598	14,573
Unpatented technologies
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	13,700	9,700
Accumulated Amortization	9,811	9,700
Net Carrying Amount	3,889
Drawings and manuals
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,558	3,000
Accumulated Amortization	1,758	2,142
Net Carrying Amount	800	858
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,332	5,268
Accumulated Amortization	4,504	4,148
Net Carrying Amount	$ 828	$ 1,120

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Amortization Expense (Details) $ in Thousands	Dec. 31, 2019USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2020	$ 50,147
2021	49,319
2022	47,820
2023	33,928
2024	$ 23,271

Debt - Schedule of Debt (Detail

Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	May 03, 2018
Debt Instrument [Line Items]
Finance lease obligations	$ 4,530
Finance lease obligations		$ 4,584
Total	569,530	674,584
Net unamortized discounts and issuance costs	(9,709)	(11,377)
Total long-term debt	559,821	663,207
Revolving credit facility
Debt Instrument [Line Items]
Long-term debt, gross	0	0
Term loan facility
Debt Instrument [Line Items]
Long-term debt, gross	$ 265,000	370,000
Senior Notes | 6.375% Senior Notes due 2026
Debt Instrument [Line Items]
Debt interest rate	6.375%		6.375%
Long-term debt, gross	$ 300,000	$ 300,000

Debt - Narrative (Details)

Debt - Narrative (Details)	May 09, 2018USD ($)	May 03, 2018USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Debt Instrument [Line Items]
Proceeds from long-term debt, net of discounts			$ 36,500,000	$ 713,963,000	$ 0
Cash payment to Dover		$ 700,000,000
Senior Notes | 6.375% Senior Notes due 2026
Debt Instrument [Line Items]
Principal amount of debt issued		$ 300,000,000	$ 300,000,000
Debt interest rate		6.375%	6.375%
Proceeds from long-term debt, net of discounts		$ 293,800,000
Redemption price, percentage of principal amount of debt		100.00%
Term loan facility
Debt Instrument [Line Items]
Principal amount of debt issued			$ 265,000,000
Term loan facility | Credit Agreement
Debt Instrument [Line Items]
Principal amount of debt issued	$ 415,000,000
Debt instrument, term	7 years
Proceeds from issuance of debt	$ 408,700,000
Mandatory amortization payment, percent per annum	1.00%
Mandatory prepayments, percent of net cash proceeds	100.00%
Mandatory prepayments, percent of net cash proceeds, step down one	75.00%
Mandatory prepayments, percent of net cash proceeds, step down two	50.00%
Mandatory prepayment in excess of cash flow	50.00%
Mandatory prepayment in excess of cash flow, step down one	25.00%
Mandatory prepayment in excess of cash flow, step down two	0.00%
Revolving Credit Facility | Credit Agreement
Debt Instrument [Line Items]
Debt instrument, term	5 years
Maximum borrowing capacity	$ 250,000,000
Letters of credit | Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 50,000,000
JP Morgan Chase Bank, N.A. | Credit Agreement
Debt Instrument [Line Items]
Minimum interest coverage ratio	2.75
Fiscal Quarter Ending June 30, 2019 | JP Morgan Chase Bank, N.A. | Credit Agreement
Debt Instrument [Line Items]
Maximum total leverage ratio	4
Fiscal Quarter Ending June 30, 2020 | JP Morgan Chase Bank, N.A. | Credit Agreement
Debt Instrument [Line Items]
Maximum total leverage ratio	3.75
After Fiscal Quarter Ending June 30, 2020 | JP Morgan Chase Bank, N.A. | Credit Agreement
Debt Instrument [Line Items]
Maximum total leverage ratio	3.50

Debt - Aggregate contractual fu

Debt - Aggregate contractual future principal payments (Details) $ in Thousands	Dec. 31, 2019USD ($)
Debt Disclosure [Abstract]
2020	$ 0
2021	0
2022	0
2023	0
2024	0
Thereafter	565,000
Long-term Debt	$ 565,000

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Outstanding letters of credit	$ 15.7	$ 3.6
Accrued liabilities for remediation	2
Indemnification Agreement
Loss Contingencies [Line Items]
Indemnification expense	$ 3.4

Stockholders' Equity - Capital

Stockholders' Equity - Capital Stock Activity (Details) - shares	May 09, 2018	Dec. 31, 2019	Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)		77,400,000
Issuance of common stock at the Separation (in shares)	77,339,828
Ending balance (in shares)		77,500,000	77,400,000
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)		77,353,000	0
Issuance of common stock at the Separation (in shares)			77,340,000
Shares issued—share-based compensation (in shares)		107,000	13,000
Ending balance (in shares)		77,460,000	77,353,000

Stockholders' Equity - Narrativ

Stockholders' Equity - Narrative (Details) - $ / shares	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Preferred stock authorized (in shares)		250,000,000
Preferred stock, par value (dollars per share)	$ 0.01	$ 0.01
Preferred stock, outstanding (in shares)	0		0

Stockholders' Equity - Accumula

Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 975,983	$ 1,635,509	$ 1,548,504
Net transfers to/from Dover		(742,054)	(29,543)
Other comprehensive income (loss)	(1,131)	(12,754)	7,241
Ending Balance	1,036,214	975,983	1,635,509
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(36,146)	(21,936)
Reclassification adjustment for cumulative effect of change in accounting principle				$ 0
Net transfers to/from Dover		0
Other comprehensive income (loss) before reclassifications, net of tax	936	(14,210)
Reclassification adjustment for net losses included in net income, net of tax	0	0
Other comprehensive income (loss)	936	(14,210)
Ending Balance	(35,210)	(36,146)	(21,936)
Defined Pension and Other Post-Retirement Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(6,760)	(4,480)
Reclassification adjustment for cumulative effect of change in accounting principle				(1,315)
Net transfers to/from Dover		(2,421)
Other comprehensive income (loss) before reclassifications, net of tax	(2,711)	856
Reclassification adjustment for net losses included in net income, net of tax	644	600
Other comprehensive income (loss)	(2,067)	1,456
Ending Balance	(8,827)	(6,760)	(4,480)
Accum. Other Comp. Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(42,906)	(26,416)	(33,657)
Reclassification adjustment for cumulative effect of change in accounting principle				$ (1,315)
Net transfers to/from Dover		(2,421)
Other comprehensive income (loss) before reclassifications, net of tax	(1,775)	(13,354)
Reclassification adjustment for net losses included in net income, net of tax	644	600
Other comprehensive income (loss)	(1,131)	(12,754)	7,241
Ending Balance	$ (44,037)	$ (42,906)	$ (26,416)

Stockholders' Equity - Reclassi

Stockholders' Equity - Reclassifications from Accumulated Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	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, 2019	Dec. 31, 2018	Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense, net									$ 2,603	$ 3,056	$ 9,443
Income before income taxes									(59,186)	(121,353)	(88,355)
Provision for (benefit from) income taxes									6,226	28,162	(22,164)
Net income (loss)	$ 1,574	$ (11,588)	$ (23,008)	$ (19,938)	$ (23,347)	$ (24,015)	$ (21,879)	$ (23,950)	(52,960)	(93,191)	(110,519)
Amortization of actuarial loss and net transition obligation | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense, net									364	330	397
Amortization of prior service cost | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense, net									2	1	2
Settlement loss | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense, net									508	479	0
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes									874	810	399
Provision for (benefit from) income taxes									(230)	(210)	(141)
Net income (loss)									$ 644	$ 600	$ 258

Revenue - Disaggregation of Rev

Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	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, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Lease and other revenue									$ 48,600
Lease and other revenue										$ 44,604	$ 24,388
Total revenue	$ 247,748	$ 276,839	$ 306,170	$ 300,494	$ 313,133	$ 316,171	$ 305,747	$ 283,105	1,131,251	1,218,156	1,010,466
United States
Disaggregation of Revenue [Line Items]
Total revenue									861,001	959,167	770,843
Canada
Disaggregation of Revenue [Line Items]
Total revenue									70,314	79,816	79,186
Middle East
Disaggregation of Revenue [Line Items]
Total revenue									60,064	53,516	48,899
Europe
Disaggregation of Revenue [Line Items]
Total revenue									51,965	38,669	28,112
Latin America
Disaggregation of Revenue [Line Items]
Total revenue									32,408	33,976	34,350
Australia
Disaggregation of Revenue [Line Items]
Total revenue									30,841	33,247	23,667
Asia-Pacific and other
Disaggregation of Revenue [Line Items]
Total revenue									24,658	19,765	25,409
Reporting segments
Disaggregation of Revenue [Line Items]
Total revenue									1,131,251	1,218,156	1,010,466
Product revenue
Disaggregation of Revenue [Line Items]
Revenue									1,000,630	1,090,218	922,692
Service revenue
Disaggregation of Revenue [Line Items]
Revenue									82,021	83,334	63,386
Drilling Technologies | Reporting segments
Disaggregation of Revenue [Line Items]
Total revenue									246,887	285,565	227,653
Production & Automation Technologies
Disaggregation of Revenue [Line Items]
Total revenue									884,364	932,591	782,813
Production & Automation Technologies | Reporting segments
Disaggregation of Revenue [Line Items]
Total revenue									884,364	932,591	782,813
Production & Automation Technologies | Intra-segment eliminations
Disaggregation of Revenue [Line Items]
Total revenue									(1,020)	(1,040)	(5,131)
Production & Automation Technologies | Artificial lift | Reporting segments
Disaggregation of Revenue [Line Items]
Total revenue									687,607	725,584	602,287
Production & Automation Technologies | Digital products | Reporting segments
Disaggregation of Revenue [Line Items]
Total revenue									134,660	119,293	82,093
Production & Automation Technologies | Other production equipment | Reporting segments
Disaggregation of Revenue [Line Items]
Total revenue									$ 63,117	$ 88,754	$ 103,564

Revenue - Contract Balances (De

Revenue - Contract Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018
Revenue from Contract with Customer [Abstract]
Contract assets	$ 285	$ 4,571	$ 4,733
Contract liabilities - current	$ 6,148	$ 5,863	$ 3,912

Leases - Narrative (Details)

Leases - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)
Property, Plant and Equipment [Line Items]
Lease revenue	$ 44.7
Assets Leased to Others
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 37.1
Minimum
Property, Plant and Equipment [Line Items]
Lessor, term of leases	6 months
Maximum
Property, Plant and Equipment [Line Items]
Lessor, term of leases	9 months

Leases - Schedule of Balance Sh

Leases - Schedule of Balance Sheet Information (Details) $ in Thousands	Dec. 31, 2019USD ($)
Leases Statement of Financial Position [Abstract]
Finance lease, right-of-use asset	$ 9,406
Operating lease, right-of-use asset	24,289
Total right-of-use assets	33,695
Finance lease, liability, current	4,845
Finance lease obligations	4,530
Operating lease, liability, current	7,620
Operating lease, liability, noncurrent	19,419
Total lease liability	$ 36,414

Leases - Lease Cost (Details)

Leases - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Finance lease cost, amortization of right-of-use assets	$ 5,200
Finance lease cost, Interest on lease liabilities	439
Operating lease cost	11,191
Short-term lease cost	3,996
Variable lease cost	1,049
Sublease income	(463)
Total net lease cost	$ 21,412
Rent expense		$ 16,800	$ 15,600
Operating lease, weighted-average remaining lease term	4 years 7 months 6 days
Finance lease, weighted-average remaining lease term	2 years 1 month 6 days
Operating lease, weighted-average discount rate (as a percent)	6.70%
Finance lease, weighted-average discount rate (as a percent)	5.30%

Leases - Maturity Tables under

Leases - Maturity Tables under Topic 842 (Details) $ in Thousands	Dec. 31, 2019USD ($)
Operating
2020	$ 9,096
2021	5,939
2022	5,147
2023	4,456
2024	2,906
Thereafter	4,889
Total future minimum lease payments	32,433
Interest included within lease payments	(5,394)
Total lease liabilities	27,039
Finance
2020	5,219
2021	3,488
2022	1,054
2023	155
2024	34
Thereafter	0
Total future minimum lease payments	9,950
Interest included within lease payments	(575)
Total lease liabilities	$ 9,375

Leases - Lease Assets (Details)

Leases - Lease Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 674,903	$ 636,672
Accumulated depreciation	(426,722)	(392,344)
Property, plant and equipment, net	248,181	$ 244,328
Equipment Leased Assets
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	169,993
Accumulated depreciation	(71,968)
Property, plant and equipment, net	$ 98,025
Cable Equipment
Property, Plant and Equipment [Line Items]
Useful life	1 year
Property, plant, and equipment	$ 52,144
Downhole Equipment
Property, Plant and Equipment [Line Items]
Useful life	1 year
Property, plant, and equipment	$ 32,193
Surface Equipment
Property, Plant and Equipment [Line Items]
Useful life	5 years
Property, plant, and equipment	$ 69,566
Other Lease Equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 16,090
Minimum | Other Lease Equipment
Property, Plant and Equipment [Line Items]
Useful life	3 years
Maximum | Other Lease Equipment
Property, Plant and Equipment [Line Items]
Useful life	5 years

Restructuring - Schedule of Res

Restructuring - Schedule of Restructuring (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 5,177	$ 5,632	$ 6,921
Cost of goods and services
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,592	4,693	6,332
Selling, general and administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,585	939	589
Production & Automation Technologies
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4,467	5,632	6,921
Drilling Technologies
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 710	$ 0	$ 0

Restructuring - Narrative (Deta

Restructuring - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 5,177	$ 5,632	$ 6,921
Production & Automation Technologies
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4,467	5,632	6,921
Drilling Technologies
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 710	$ 0	$ 0

Income Taxes - Components of In

Income Taxes - Components of Income (Loss) Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Domestic	$ 51,073	$ 104,234	$ 65,923
Foreign	8,113	17,119	22,432
Income before income taxes	$ 59,186	$ 121,353	$ 88,355

Income Taxes - Provision for (B

Income Taxes - Provision for (Benefit From) Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
U.S. federal	$ 15,327	$ 24,221	$ 42,690
State and local	1,196	1,598	4,255
Foreign	4,264	4,362	6,127
Total current	20,787	30,181	53,072
Deferred:
U.S. federal	(12,815)	(2,255)	(73,544)
State and local	(1,156)	2,735	(1,595)
Foreign	(590)	(2,499)	(97)
Total deferred	(14,561)	(2,019)	(75,236)
Provision for (benefit from) income taxes	$ 6,226	$ 28,162	$ (22,164)

Income Taxes - Effective income

Income Taxes - Effective income tax rate reconciliation (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 21, 2017
Income Tax Disclosure [Abstract]
Statutory U.S. federal income tax rate	21.00%	21.00%	35.00%	35.00%
State and local taxes, net of federal income tax benefit	3.20%	3.40%	2.10%
Foreign withholding tax	1.80%	0.30%	0.00%
Foreign derived intangible income	(0.80%)	(1.90%)	0.00%
Foreign operations tax effect	0.00%	0.30%	(2.80%)
Research and experimentation tax credits	(1.20%)	(0.60%)	(0.70%)
Foreign tax credit	(8.00%)	(1.50%)	0.00%
Domestic manufacturing deduction	0.00%	0.00%	(4.40%)
Nondeductible expenses	2.50%	0.70%	0.70%
ESOP dividends	0.00%	(0.10%)	(0.20%)
Branch income	0.60%	0.00%	1.10%
Tax return to accrual adjustments	(9.40%)	0.00%	0.00%
State deferred taxes	(7.90%)	0.00%	0.00%
Changes due to the Tax Reform Act	0.00%	0.00%	(54.30%)
Global intangible low-taxed income	0.00%	2.30%	0.00%
Change in valuation allowance	9.00%	0.00%	0.00%
Other	(0.30%)	(0.70%)	(1.60%)
Effective income tax rate	10.50%	23.20%	(25.10%)

Income Taxes - Components of De

Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets attributable to:
Accrued compensation	$ 8,725	$ 8,146
Accrued expenses, principally for state income taxes, interest and warranty	455	2,807
Net operating loss and other carryforwards	5,937	766
Inventories	1,380	0
Accounts receivable, principally due to allowance for doubtful accounts	1,699	973
Long-term liabilities, principally warranty and exit cost	6,178	505
Other assets	1,202	64
Deferred tax assets	25,576	13,261
Valuation allowance	(6,027)	(722)
Deferred tax assets, net of valuation allowance	19,549	12,539
Deferred tax liabilities attributable to:
Inventories	0	(2,061)
Intangible assets, including goodwill	(66,736)	(83,436)
Property, plant and equipment	(36,873)	(25,520)
Deferred tax liabilities	(103,609)	(111,017)
Net deferred tax liabilities	(84,060)	(98,478)
Other non-current assets	0	1,294
Deferred income taxes	$ (84,060)	$ (99,772)

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 21, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate	10.50%	23.20%	(25.10%)
Operating loss carryforwards, foreign	$ 1.8
Foreign tax credit carryforwards	$ 4.2
Statutory U.S. federal income tax rate	21.00%	21.00%	35.00%	35.00%
Tax Cuts and Jobs Act, incomplete accounting, change in tax rate, deferred tax liability, provisional income tax benefit		$ 53.2
Tax Cuts And Jobs Act, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense		$ 3.9

Employee Benefit Plans - Narrat

Employee Benefit Plans - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	May 09, 2018
Defined Benefit Plan Disclosure [Line Items]
Liability, defined benefit plan				$ 6,100
Accumulated other comprehensive (income) loss, defined benefit plan, after tax				$ 2,400
Expense relating to defined contribution plans	$ 9,000	$ 9,600	$ 8,200
Pensions
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, net periodic benefit cost (credit)	1,289	1,068	$ 114
Liability, defined benefit plan	1,880	964
Expected future contributions	1,100
Multiemployer Plans, Pension
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, net periodic benefit cost (credit)	$ 1,600	$ 4,600

Employee Benefit Plans - Obliga

Employee Benefit Plans - Obligations and Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	May 09, 2018
Amounts recognized in the Combined Balance Sheets consist of:
Other long-term liabilities				$ (6,100)
Pensions
Change in benefit obligation:
Defined benefit plan, benefit obligation, beginning of the period	$ 15,948	$ 3,881
Service cost	760	598	$ 106
Interest cost	588	455	137
Benefits paid	(328)	(370)
Actuarial (gain)/loss (1)	2,784	(530)
Liabilities assumed from the Separation	0	14,348
Amendments	250	0
Settlements and curtailments	(2,156)	(1,763)
Foreign currency translation and other	503	(671)
Defined benefit plan, benefit obligation, end of the period	18,349	15,948	3,881
Change in plan assets:
Defined benefit plan, plan assets, beginning of the period	15,130	3,993
Actual return on plan assets	1,888	(76)
Company contributions	1,486	4,740
Benefits paid	(328)	(370)
Assets assumed from the Separation	0	9,227
Settlements and curtailments	(2,156)	(1,763)
Foreign currency translation and other	467	(621)
Defined benefit plan, plan assets, end of the period	16,487	15,130	3,993
Funded (unfunded) status at December 31	(1,862)	(818)
Amounts recognized in the Combined Balance Sheets consist of:
Other non-current assets	18	146
Accrued compensation and employee benefits	0	0
Other long-term liabilities	(1,880)	(964)
Accumulated benefit obligations	16,235	14,076
Other post-retirement benefits
Change in benefit obligation:
Defined benefit plan, benefit obligation, beginning of the period	13,061	14,197
Service cost	0	0	0
Interest cost	503	448	621
Benefits paid	(1,751)	(1,022)
Actuarial (gain)/loss (1)	1,398	(562)
Liabilities assumed from the Separation	0	0
Amendments	0	0
Settlements and curtailments	0	0
Foreign currency translation and other	0	0
Defined benefit plan, benefit obligation, end of the period	13,211	13,061	14,197
Change in plan assets:
Defined benefit plan, plan assets, beginning of the period	0	0
Actual return on plan assets	0	0
Company contributions	1,751	1,022
Benefits paid	(1,751)	(1,022)
Assets assumed from the Separation	0	0
Settlements and curtailments	0	0
Foreign currency translation and other	0	0
Defined benefit plan, plan assets, end of the period	0	0	$ 0
Funded (unfunded) status at December 31	(13,211)	(13,061)
Amounts recognized in the Combined Balance Sheets consist of:
Other non-current assets	0	0
Accrued compensation and employee benefits	(1,592)	(1,598)
Other long-term liabilities	(11,619)	(11,463)
Accumulated benefit obligations	$ 13,211	$ 13,061

Employee Benefit Plans - Period

Employee Benefit Plans - Periodic benefit cost amounts recognized in accumulated other comprehensive (income) loss (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Pensions
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net actuarial loss	$ 4,699	$ 3,586
Unrecognized prior service cost	274	25
Unrecognized net transition asset	(10)	(8)
Accumulated other comprehensive loss	4,963	3,603
Other post-retirement benefits
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net actuarial loss	6,883	5,685
Unrecognized prior service cost	0	0
Unrecognized net transition asset	0	0
Accumulated other comprehensive loss	$ 6,883	$ 5,685

Employee Benefit Plans - Accumu

Employee Benefit Plans - Accumulated and projected benefit obligations in excess of plan assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Pensions
Defined Benefit Plan Disclosure [Line Items]
Aggregate accumulated benefit obligation	$ 4,108	$ 3,722
Aggregate fair value of plan assets	3,449	3,672
Aggregate projected benefit obligation	13,834	12,334
Aggregate fair value of plan assets	11,954	11,370
Other post-retirement benefits
Defined Benefit Plan Disclosure [Line Items]
Aggregate accumulated benefit obligation	13,211	13,061
Aggregate fair value of plan assets	0	0
Aggregate projected benefit obligation	13,211	13,061
Aggregate fair value of plan assets	$ 0	$ 0

Employee Benefit Plans - Net Pe

Employee Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pensions
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 760	$ 598	$ 106
Interest cost	588	455	137
Expected return on plan assets	(733)	(593)	(198)
Amortization of prior service cost	2	1	2
Amortization of actuarial loss	162	127	68
Amortization of transition obligation	2	1	(1)
Settlement loss	508	479	0
Other	0	0	0
Net periodic benefit cost	1,289	1,068	114
Other post-retirement benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0
Interest cost	503	448	621
Expected return on plan assets	0	0	0
Amortization of prior service cost	0	0	0
Amortization of actuarial loss	200	202	330
Amortization of transition obligation	0	0	0
Settlement loss	0	0	0
Other	0	0	(1)
Net periodic benefit cost	$ 703	$ 650	$ 950

Employee Benefit Plans - Weight

Employee Benefit Plans - Weighted average assumptions used in determining the benefit obligations (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pensions
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	3.11%	3.90%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.85%	3.68%	3.75%
Expected return on plan assets	4.89%	4.80%	5.50%
Other post-retirement benefits
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	3.00%	4.10%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.10%	3.35%	3.55%

Employee Benefit Plans - FVM (D

Employee Benefit Plans - FVM (Details) - Pensions - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	$ 16,487	$ 15,130	$ 3,993
Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	8,619	8,447
Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	7,868	6,683
Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0	0
Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	13,038	11,458
Mutual funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	5,170	4,775
Mutual funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	7,868	6,683
Mutual funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0	0
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	3,449	3,672
Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	3,449	3,672
Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0	0
Cash and cash equivalents | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	$ 0	$ 0

Employee Benefit Plans - Estima

Employee Benefit Plans - Estimated future benefit payments (Details) $ in Thousands	Dec. 31, 2019USD ($)
Pensions
Defined Benefit Plan Disclosure [Line Items]
2020	$ 1,139
2021	857
2022	941
2023	785
2024	782
2025-2029	5,427
Other post-retirement benefits
Defined Benefit Plan Disclosure [Line Items]
2020	1,592
2021	1,424
2022	1,295
2023	1,167
2024	1,040
2025-2029	$ 3,557

Equity and Cash Incentive Pro_3

Equity and Cash Incentive Program - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized	6,500,000
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Expiration period	10 years
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	174,726	86,817
Vesting period	3 years
Granted (in shares)	92,919
Unrecognized compensation expense not yet exercisable	$ 5.3
Weighted average period	1 year 9 months 18 days
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	440,048	414,840
Granted (in shares)	183,143
Unrecognized compensation expense not yet exercisable	$ 12.6
Weighted average period	1 year 6 months
Minimum | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Maximum | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Market Vesting Conditions | Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Granted (in shares)	46,459	86,817
Performance Vesting Conditions | Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	46,460

Equity and Cash Incentive Pro_4

Equity and Cash Incentive Program - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement [Abstract]
Stock-based compensation expense	$ 10,250	$ 5,375	$ 2,236
Tax benefit	(2,153)	(1,141)	(774)
Stock-based compensation expense, net of tax	$ 8,097	$ 4,234	$ 1,462

Equity and Cash Incentive Pro_5

Equity and Cash Incentive Program - Fair Value Assumption Used For Each SAR Granted (Details) - Stock Appreciation Rights (SARs)	12 Months Ended
	Dec. 31, 2017$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.80%
Dividend yield	2.27%
Expected life (years)	4 years 7 months 6 days
Volatility	21.90%
Grant price (in dollars per share)	$ 79.28
Fair value at date of grant (in dollars per share)	$ 12.63

Equity and Cash Incentive Pro_6

Equity and Cash Incentive Program - Summary of Activity Relating to SARs Outstanding (Details) - Stock Appreciation Rights (SARs) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Number of shares outstanding, beginning of the period (in shares) | shares	477,950
Forfeited / expired (in shares) | shares	(7,030)
Exercised (in shares) | shares	(48,559)
Number of shares outstanding, end of the period (in shares) | shares	422,361
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Weighted average exercise price outstanding, beginning of the period (in dollars per share) | $ / shares	$ 29.43
Forfeited / expired (in dollars per share) | $ / shares	34.13
Exercised (in dollars per share) | $ / shares	25.95
Weighted average exercise price outstanding, end of the period (in dollars per share) | $ / shares	$ 29.75
Weighted average remaining contractual term, outstanding (years)	6 years 1 month 6 days
Aggregate intrinsic value | $	$ 1,799
Number of shares, exercisable (in shares) | shares	253,901
Weighted average exercise price exercisable (in dollars per share) | $ / shares	$ 26.84
Weighted average remaining contractual term, exercisable (years)	5 years 4 months 24 days
Aggregate intrinsic value, exercisable | $	$ 1,799

Equity and Cash Incentive Pro_7

Equity and Cash Incentive Program - Other Information Regarding the Exercise of SARs (Details) - Stock Appreciation Rights (SARs) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of SARs that became exercisable	$ 662	$ 310	$ 1,239
Aggregate intrinsic value of SARs exercised	$ 629	$ 40	$ 2,787

Equity and Cash Incentive Pro_8

Equity and Cash Incentive Program - Fair Value and Average Attainment Used in Determining Compensation Cost of the Performance Shares (Details) - Performance shares - $ / shares	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Dover
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value at date of grant (in dollars per share)			$ 79.28
Average attainment rate reflected in expense			0.00%
Market Vesting Conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value at date of grant (in dollars per share)	$ 57.43	$ 56.32
Performance Vesting Conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value at date of grant (in dollars per share)	$ 40.22
Average attainment rate reflected in expense	100.00%

Equity and Cash Incentive Pro_9

Equity and Cash Incentive Program - Summary of Activity for Performance Share Awards (Details) - Performance shares	12 Months Ended
	Dec. 31, 2019$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of shares outstanding, beginning of the period (in shares) | shares	86,817
Granted (in shares) | shares	92,919
Forfeited (in shares) | shares	(5,010)
Vested (in shares) | shares	0
Number of shares outstanding, end of the period (in shares) | shares	174,726
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average grant-date fair value, outstanding beginning of the period (in dollars per share) | $ / shares	$ 56.32
Granted (in dollars per share) | $ / shares	48.83
Forfeited (in dollars per share) | $ / shares	52.60
Vested (in dollars per share) | $ / shares	0
Weighted average grant-date fair value, outstanding end of the period (in dollars per share) | $ / shares	$ 52.44

Equity and Cash Incentive Pr_10

Equity and Cash Incentive Program - Summary of Activity for Restricted Stock Units (Details) - Restricted Stock Units (RSUs)	12 Months Ended
	Dec. 31, 2019$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of shares outstanding, beginning of the period (in shares) | shares	414,840
Granted (in shares) | shares	183,143
Forfeited (in shares) | shares	(16,498)
Vested (in shares) | shares	(141,437)
Number of shares outstanding, end of the period (in shares) | shares	440,048
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average grant-date fair value, outstanding beginning of the period (in dollars per share) | $ / shares	$ 41.91
Granted (in dollars per share) | $ / shares	37.82
Forfeited (in dollars per share) | $ / shares	40.74
Vested (in dollars per share) | $ / shares	39.35
Weighted average grant-date fair value, outstanding end of the period (in dollars per share) | $ / shares	$ 41.07

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	May 03, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of held-for-sale assets	$ 1,700,000
Contingent consideration liability	1,500,000
Senior Notes | 6.375% Senior Notes due 2026
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal amount of debt issued	300,000,000	$ 300,000,000
Senior Notes | 6.375% Senior Notes due 2026 | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, fair value	316,700,000
Term loan facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal amount of debt issued	265,000,000
Term loan facility | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, fair value	$ 266,200,000

Segment Information - Segment r

Segment Information - Segment revenue and segment operating profit (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	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, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenue	$ 247,748	$ 276,839	$ 306,170	$ 300,494	$ 313,133	$ 316,171	$ 305,747	$ 283,105	$ 1,131,251	$ 1,218,156	$ 1,010,466
Interest expense, net									39,301	27,648	863
Income before income taxes									59,186	121,353	88,355
Production & Automation Technologies
Segment Reporting Information [Line Items]
Revenue									884,364	932,591	782,813
Reporting segments
Segment Reporting Information [Line Items]
Revenue									1,131,251	1,218,156	1,010,466
Operating profit									127,521	172,807	98,884
Reporting segments | Production & Automation Technologies
Segment Reporting Information [Line Items]
Revenue									884,364	932,591	782,813
Operating profit									54,024	74,187	24,567
Reporting segments | Drilling Technologies
Segment Reporting Information [Line Items]
Revenue									246,887	285,565	227,653
Operating profit									73,497	98,620	74,317
Corporate expense and other | Corporate
Segment Reporting Information [Line Items]
Operating profit									$ 29,034	$ 23,806	$ 9,666

Segment Information - Segment A

Segment Information - Segment Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 1,922,825	$ 1,973,116
Reporting segments | Production & Automation Technologies
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,668,319	1,702,396
Reporting segments | Drilling Technologies
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	209,880	231,438
Corporate expense and other | Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 44,626	$ 39,282

Segment Information - Geographi

Segment Information - Geographic segment information (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Revenue, Major Customer [Line Items]
Total property, plant, and equipment, net	$ 248,181	$ 244,328
United States
Revenue, Major Customer [Line Items]
Total property, plant, and equipment, net	238,464	233,809
Middle East
Revenue, Major Customer [Line Items]
Total property, plant, and equipment, net	2,760	3,616
Canada
Revenue, Major Customer [Line Items]
Total property, plant, and equipment, net	5,749	6,299
Australia
Revenue, Major Customer [Line Items]
Total property, plant, and equipment, net	789	254
Latin & South America
Revenue, Major Customer [Line Items]
Total property, plant, and equipment, net	$ 419	$ 350

Segment Information - Other Bus

Segment Information - Other Business Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Capital expenditures	$ 39,780	$ 57,918	$ 36,654
Depreciation and amortization	119,938	124,461	112,862
Reporting segments | Production & Automation Technologies
Segment Reporting Information [Line Items]
Capital expenditures	30,291	45,190	28,483
Depreciation and amortization	110,131	112,955	100,912
Reporting segments | Drilling Technologies
Segment Reporting Information [Line Items]
Capital expenditures	9,061	11,123	8,171
Depreciation and amortization	9,263	11,037	11,950
Corporate expense and other | Corporate
Segment Reporting Information [Line Items]
Capital expenditures	428	1,605	0
Depreciation and amortization	$ 544	$ 469	$ 0

Condensed Consolidating Finan_3

Condensed Consolidating Financial Information - Condensed Statements of Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	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, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Income Statements, Captions [Line Items]
Total revenue	$ 247,748	$ 276,839	$ 306,170	$ 300,494	$ 313,133	$ 316,171	$ 305,747	$ 283,105	$ 1,131,251	$ 1,218,156	$ 1,010,466
Cost of goods and services									754,147	801,152	690,398
Gross profit	72,634	92,699	108,760	103,011	106,595	112,327	104,090	93,992	377,104	417,004	320,068
Selling, general and administrative expense									276,014	264,947	221,407
Interest expense, net									39,301	27,648	863
Other expense, net									2,603	3,056	9,443
Income before income taxes									59,186	121,353	88,355
Provision for (benefit from) income taxes									6,226	28,162	(22,164)
Income (loss) before equity in earnings of affiliates									52,960	93,191	110,519
Equity in earnings of affiliates									0	0	0
Net income	(1,574)	11,588	23,008	19,938	23,347	24,015	21,879	23,950	52,960	93,191	110,519
Net income attributable to noncontrolling interest									796	454	930
Net income attributable to Apergy	$ (1,823)	$ 11,394	$ 22,937	$ 19,656	$ 23,187	$ 23,961	$ 21,816	$ 23,773	52,164	92,737	109,589
Comprehensive income attributable to Apergy									51,033	79,983	116,830
Adjustments and eliminations
Condensed Income Statements, Captions [Line Items]
Total revenue									(43,886)	(43,682)	(36,103)
Cost of goods and services									(44,255)	(42,977)	(35,911)
Gross profit									369	(705)	(192)
Selling, general and administrative expense									0	0	0
Interest expense, net									0	0	0
Other expense, net									0	1	0
Income before income taxes									369	(706)	(192)
Provision for (benefit from) income taxes									76	(148)	(67)
Income (loss) before equity in earnings of affiliates									293	(558)	(125)
Equity in earnings of affiliates									(95,809)	(183,557)	(141,218)
Net income									(95,516)	(184,115)	(141,343)
Net income attributable to noncontrolling interest									0	0	0
Net income attributable to Apergy									(95,516)	(184,115)	(141,343)
Comprehensive income attributable to Apergy									(94,373)	(171,359)	(148,585)
Apergy Corporation
Condensed Income Statements, Captions [Line Items]
Total revenue									0	0	0
Cost of goods and services									0	0	0
Gross profit									0	0	0
Selling, general and administrative expense									271	1,614	0
Interest expense, net									38,673	26,973	0
Other expense, net									0	0	0
Income before income taxes									(38,944)	(28,587)	0
Provision for (benefit from) income taxes									(8,906)	(8,727)	0
Income (loss) before equity in earnings of affiliates									(30,038)	(19,860)	0
Equity in earnings of affiliates									82,202	112,597	109,589
Net income									52,164	92,737	109,589
Net income attributable to noncontrolling interest									0	0	0
Net income attributable to Apergy									52,164	92,737	109,589
Comprehensive income attributable to Apergy									51,033	79,983	116,830
Subsidiary Guarantors
Condensed Income Statements, Captions [Line Items]
Total revenue									1,005,032	1,091,565	882,062
Cost of goods and services									654,440	696,874	585,592
Gross profit									350,592	394,691	296,470
Selling, general and administrative expense									251,834	241,796	201,797
Interest expense, net									594	633	834
Other expense, net									937	1,322	10,169
Income before income taxes									97,227	150,940	83,670
Provision for (benefit from) income taxes									13,934	38,395	(10,510)
Income (loss) before equity in earnings of affiliates									83,293	112,545	94,180
Equity in earnings of affiliates									4,313	25,652	21,294
Net income									87,606	138,197	115,474
Net income attributable to noncontrolling interest									0	0	0
Net income attributable to Apergy									87,606	138,197	115,474
Comprehensive income attributable to Apergy									86,077	136,893	118,354
Subsidiary Non-guarantors
Condensed Income Statements, Captions [Line Items]
Total revenue									170,105	170,273	164,507
Cost of goods and services									143,962	147,255	140,717
Gross profit									26,143	23,018	23,790
Selling, general and administrative expense									23,909	21,537	19,610
Interest expense, net									34	42	29
Other expense, net									1,666	1,733	(726)
Income before income taxes									534	(294)	4,877
Provision for (benefit from) income taxes									1,122	(1,358)	(11,587)
Income (loss) before equity in earnings of affiliates									(588)	1,064	16,464
Equity in earnings of affiliates									9,294	45,308	10,335
Net income									8,706	46,372	26,799
Net income attributable to noncontrolling interest									796	454	930
Net income attributable to Apergy									7,910	45,918	25,869
Comprehensive income attributable to Apergy									8,296	34,466	30,231
Product revenue
Condensed Income Statements, Captions [Line Items]
Product and service revenue									1,000,630	1,090,218	922,692
Product revenue | Adjustments and eliminations
Condensed Income Statements, Captions [Line Items]
Product and service revenue									0	0	0
Product revenue | Apergy Corporation
Condensed Income Statements, Captions [Line Items]
Product and service revenue									0	0	0
Product revenue | Subsidiary Guarantors
Condensed Income Statements, Captions [Line Items]
Product and service revenue									884,355	965,057	799,337
Product revenue | Subsidiary Non-guarantors
Condensed Income Statements, Captions [Line Items]
Product and service revenue									116,275	125,161	123,355
Other revenue
Condensed Income Statements, Captions [Line Items]
Product and service revenue									130,621	127,938	87,774
Other revenue | Adjustments and eliminations
Condensed Income Statements, Captions [Line Items]
Product and service revenue									(43,886)	(43,682)	(36,103)
Other revenue | Apergy Corporation
Condensed Income Statements, Captions [Line Items]
Product and service revenue									0	0	0
Other revenue | Subsidiary Guarantors
Condensed Income Statements, Captions [Line Items]
Product and service revenue									120,677	126,508	82,725
Other revenue | Subsidiary Non-guarantors
Condensed Income Statements, Captions [Line Items]
Product and service revenue									$ 53,830	$ 45,112	$ 41,152

Condensed Consolidating Finan_4

Condensed Consolidating Financial Information - Condensed Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jul. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 35,290		$ 41,832	$ 23,712	$ 26,027
Receivables	219,874		251,436
Inventories, net	211,342		219,421
Prepaid expenses and other current assets	26,934		18,534
Total current assets	493,440		531,223
Property, plant and equipment, net	248,181		244,328
Goodwill	911,113	$ 5,510	904,985	910,088
Advances due from affiliates	0		0
Investment in subsidiaries	0		0
Intangible assets, net	238,707		283,688
Other non-current assets	31,384		8,892
Total assets	1,922,825		1,973,116
Liabilities and Equity
Accounts payable	120,291		140,125
Accrued compensation and employee benefits	38,470		40,546
Current portion of finance lease liabilities	4,845
Current portion of finance lease liabilities			4,320
Accrued expenses and other current liabilities	36,075		28,761
Total current liabilities	199,681		213,752
Advances due to affiliates	0		0
Long-term debt	559,821		663,207
Deferred income taxes	84,060		99,772
Other long-term liabilities	43,049		20,402
Total liabilities	886,611		997,133
Stockholders’ equity:
Stockholders’ capital	1,076,997		1,016,431
Accumulated other comprehensive loss	(44,037)		(42,906)
Total stockholders’ equity	1,032,960		973,525
Noncontrolling interest	3,254		2,458
Total equity	1,036,214		975,983	1,635,509	1,548,504
Total liabilities and equity	1,922,825		1,973,116
Adjustments and eliminations
Assets
Cash and cash equivalents	0		0	0	0
Receivables	(9,799)		(17,044)
Inventories, net	(1,269)		(1,632)
Prepaid expenses and other current assets	0		(24,542)
Total current assets	(11,068)		(43,218)
Property, plant and equipment, net	0		0
Goodwill	0		0
Advances due from affiliates	(603,967)		(697,876)
Investment in subsidiaries	(2,331,101)		(2,231,492)
Intangible assets, net	0		0
Other non-current assets	0		0
Total assets	(2,946,136)		(2,972,586)
Liabilities and Equity
Accounts payable	(9,799)		(17,044)
Accrued compensation and employee benefits	0		0
Current portion of finance lease liabilities	0
Current portion of finance lease liabilities			0
Accrued expenses and other current liabilities	(1,269)		(26,174)
Total current liabilities	(11,068)		(43,218)
Advances due to affiliates	(603,967)		(697,876)
Long-term debt	0		0
Deferred income taxes	0		0
Other long-term liabilities	0		0
Total liabilities	(615,035)		(741,094)
Stockholders’ equity:
Stockholders’ capital	(2,331,101)		(2,231,492)
Accumulated other comprehensive loss	0		0
Total stockholders’ equity	(2,331,101)		(2,231,492)
Noncontrolling interest	0		0
Total equity	(2,331,101)		(2,231,492)
Total liabilities and equity	(2,946,136)		(2,972,586)
Apergy Corporation
Assets
Cash and cash equivalents	108		108	0	0
Receivables	572		1,743
Inventories, net	0		0
Prepaid expenses and other current assets	40		24,583
Total current assets	720		26,434
Property, plant and equipment, net	0		0
Goodwill	0		0
Advances due from affiliates	495,699		600,802
Investment in subsidiaries	1,095,712		1,008,325
Intangible assets, net	0		0
Other non-current assets	3,074		3,996
Total assets	1,595,205		1,639,557
Liabilities and Equity
Accounts payable	60		22
Accrued compensation and employee benefits	0		0
Current portion of finance lease liabilities	0
Current portion of finance lease liabilities			0
Accrued expenses and other current liabilities	3,639		4,929
Total current liabilities	3,699		4,951
Advances due to affiliates	0		0
Long-term debt	555,292		658,623
Deferred income taxes	0		0
Other long-term liabilities	0		0
Total liabilities	558,991		663,574
Stockholders’ equity:
Stockholders’ capital	1,036,214		975,983
Accumulated other comprehensive loss	0		0
Total stockholders’ equity	1,036,214		975,983
Noncontrolling interest	0		0
Total equity	1,036,214		975,983
Total liabilities and equity	1,595,205		1,639,557
Subsidiary Guarantors
Assets
Cash and cash equivalents	21,705		27,533	5,763	3,730
Receivables	190,101		231,718
Inventories, net	181,596		190,117
Prepaid expenses and other current assets	25,571		15,387
Total current assets	418,973		464,755
Property, plant and equipment, net	236,295		231,373
Goodwill	639,281		633,771
Advances due from affiliates	20,582		14,185
Investment in subsidiaries	683,003		682,545
Intangible assets, net	168,711		198,531
Other non-current assets	20,426		2,818
Total assets	2,187,271		2,227,978
Liabilities and Equity
Accounts payable	102,120		123,812
Accrued compensation and employee benefits	31,974		35,278
Current portion of finance lease liabilities	4,745
Current portion of finance lease liabilities			4,320
Accrued expenses and other current liabilities	28,627		46,458
Total current liabilities	167,466		209,868
Advances due to affiliates	583,386		683,700
Long-term debt	4,388		4,462
Deferred income taxes	68,286		79,344
Other long-term liabilities	36,610		19,441
Total liabilities	860,136		996,815
Stockholders’ equity:
Stockholders’ capital	1,336,012		1,238,517
Accumulated other comprehensive loss	(8,877)		(7,354)
Total stockholders’ equity	1,327,135		1,231,163
Noncontrolling interest	0		0
Total equity	1,327,135		1,231,163
Total liabilities and equity	2,187,271		2,227,978
Subsidiary Non-guarantors
Assets
Cash and cash equivalents	13,477		14,191	$ 17,949	$ 22,297
Receivables	39,000		35,019
Inventories, net	31,015		30,936
Prepaid expenses and other current assets	1,323		3,106
Total current assets	84,815		83,252
Property, plant and equipment, net	11,886		12,955
Goodwill	271,832		271,214
Advances due from affiliates	87,686		82,889
Investment in subsidiaries	552,386		540,622
Intangible assets, net	69,996		85,157
Other non-current assets	7,884		2,078
Total assets	1,086,485		1,078,167
Liabilities and Equity
Accounts payable	27,910		33,335
Accrued compensation and employee benefits	6,496		5,268
Current portion of finance lease liabilities	100
Current portion of finance lease liabilities			0
Accrued expenses and other current liabilities	5,078		3,548
Total current liabilities	39,584		42,151
Advances due to affiliates	20,581		14,176
Long-term debt	141		122
Deferred income taxes	15,774		20,428
Other long-term liabilities	6,439		961
Total liabilities	82,519		77,838
Stockholders’ equity:
Stockholders’ capital	1,035,872		1,033,423
Accumulated other comprehensive loss	(35,160)		(35,552)
Total stockholders’ equity	1,000,712		997,871
Noncontrolling interest	3,254		2,458
Total equity	1,003,966		1,000,329
Total liabilities and equity	$ 1,086,485		$ 1,078,167

Condensed Consolidating Finan_5

Condensed Consolidating Financial Information - Consolidated Cash Flows (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jun. 30, 2019	Oct. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Cash Flow Statements, Captions [Line Items]
Cash provided (required) by operating activities			$ 155,899	$ 163,900	$ 76,050
Cash provided (required) by investing activities:
Capital expenditures			(39,780)	(57,918)	(36,654)
Proceeds from sale of property, plant and equipment			4,598	1,187	3,547
Proceeds from (payment on) sale of businesses	$ (2,200)		(2,194)
Proceeds from (payment on) sale of businesses		$ 2,500		2,473	0
Acquisition (net of cash and cash equivalents acquired)			(12,500)	0	(8,842)
Purchase price adjustments on acquisition			0	53	0
Net cash required by investing activities			(49,876)	(54,205)	(41,949)
Cash provided (required) by financing activities:
Proceeds from long-term debt, net of discounts			36,500	713,963	0
Payment of debt issue costs			0	(16,006)	0
Repayment of long-term debt			(141,500)	(45,000)	(599)
Advances due to (from) affiliates			0	0
Distributions to Dover Corporation, net			0	(736,557)	(31,192)
Distribution to noncontrolling interest			0	(2,720)	(1,212)
Payment of capital lease obligations			(5,555)	(4,518)	(3,690)
Payments related to taxes withheld on stock-based compensation			(1,848)	0	0
Net cash required by financing activities			(112,403)	(90,838)	(36,693)
Effect of exchange rate changes on cash and cash equivalents			(162)	(737)	277
Net increase (decrease) in cash and cash equivalents			(6,542)	18,120	(2,315)
Cash and cash equivalents at beginning of period			41,832	23,712	26,027
Cash and cash equivalents at end of period			35,290	41,832	23,712
Adjustments and eliminations
Condensed Cash Flow Statements, Captions [Line Items]
Cash provided (required) by operating activities				(999)	67
Cash provided (required) by investing activities:
Capital expenditures			0	0	0
Proceeds from sale of property, plant and equipment			0	0	0
Proceeds from (payment on) sale of businesses			0
Proceeds from (payment on) sale of businesses				0
Acquisition (net of cash and cash equivalents acquired)			0		0
Purchase price adjustments on acquisition				0
Net cash required by investing activities			0	0	0
Cash provided (required) by financing activities:
Proceeds from long-term debt, net of discounts			0	0
Payment of debt issue costs				0
Repayment of long-term debt			0	0	0
Distributions to Dover Corporation, net				999	(67)
Distribution to noncontrolling interest				0	0
Payment of capital lease obligations			0	0	0
Payments related to taxes withheld on stock-based compensation			0
Net cash required by financing activities				999	(67)
Effect of exchange rate changes on cash and cash equivalents			0	0	0
Net increase (decrease) in cash and cash equivalents			0	0	0
Cash and cash equivalents at beginning of period			0	0	0
Cash and cash equivalents at end of period			0	0	0
Apergy Corporation
Condensed Cash Flow Statements, Captions [Line Items]
Cash provided (required) by operating activities			(48,970)	(51,728)	0
Cash provided (required) by investing activities:
Capital expenditures			0	0	0
Proceeds from sale of property, plant and equipment			0	0	0
Proceeds from (payment on) sale of businesses			0
Proceeds from (payment on) sale of businesses				0
Acquisition (net of cash and cash equivalents acquired)			0		0
Purchase price adjustments on acquisition				0
Net cash required by investing activities			0	0	0
Cash provided (required) by financing activities:
Proceeds from long-term debt, net of discounts			36,500	713,963
Payment of debt issue costs				(16,006)
Repayment of long-term debt			(141,500)	(45,000)	0
Advances due to (from) affiliates			153,970	(600,802)
Distributions to Dover Corporation, net				(319)	0
Distribution to noncontrolling interest				0	0
Payment of capital lease obligations			0	0	0
Payments related to taxes withheld on stock-based compensation			0
Net cash required by financing activities			48,970	51,836	0
Effect of exchange rate changes on cash and cash equivalents			0	0	0
Net increase (decrease) in cash and cash equivalents			0	108	0
Cash and cash equivalents at beginning of period			108	0	0
Cash and cash equivalents at end of period			108	108	0
Subsidiary Guarantors
Condensed Cash Flow Statements, Captions [Line Items]
Cash provided (required) by operating activities			204,877	200,907	64,422
Cash provided (required) by investing activities:
Capital expenditures			(37,725)	(55,070)	(35,008)
Proceeds from sale of property, plant and equipment			4,580	1,127	3,433
Proceeds from (payment on) sale of businesses			(2,194)
Proceeds from (payment on) sale of businesses				2,473
Acquisition (net of cash and cash equivalents acquired)			(12,500)		0
Purchase price adjustments on acquisition				0
Net cash required by investing activities			(47,839)	(51,470)	(31,575)
Cash provided (required) by financing activities:
Proceeds from long-term debt, net of discounts			0	0
Payment of debt issue costs				0
Repayment of long-term debt			0	0	0
Advances due to (from) affiliates			(155,578)	621,109
Distributions to Dover Corporation, net				(744,258)	(27,124)
Distribution to noncontrolling interest				0	0
Payment of capital lease obligations			(5,493)	(4,518)	(3,690)
Payments related to taxes withheld on stock-based compensation			(1,795)
Net cash required by financing activities			(162,866)	(127,667)	(30,814)
Effect of exchange rate changes on cash and cash equivalents			0	0	0
Net increase (decrease) in cash and cash equivalents			(5,828)	21,770	2,033
Cash and cash equivalents at beginning of period			27,533	5,763	3,730
Cash and cash equivalents at end of period			21,705	27,533	5,763
Subsidiary Non-guarantors
Condensed Cash Flow Statements, Captions [Line Items]
Cash provided (required) by operating activities			(8)	15,720	11,561
Cash provided (required) by investing activities:
Capital expenditures			(2,055)	(2,848)	(1,646)
Proceeds from sale of property, plant and equipment			18	60	114
Proceeds from (payment on) sale of businesses				0
Acquisition (net of cash and cash equivalents acquired)					(8,842)
Purchase price adjustments on acquisition				53
Net cash required by investing activities			(2,037)	(2,735)	(10,374)
Cash provided (required) by financing activities:
Proceeds from long-term debt, net of discounts			0	0
Payment of debt issue costs				0
Repayment of long-term debt			0	0	(599)
Advances due to (from) affiliates			1,608	(20,307)
Distributions to Dover Corporation, net				7,021	(4,001)
Distribution to noncontrolling interest				(2,720)	(1,212)
Payment of capital lease obligations			(62)	0	0
Payments related to taxes withheld on stock-based compensation			(53)
Net cash required by financing activities			1,493	(16,006)	(5,812)
Effect of exchange rate changes on cash and cash equivalents			(162)	(737)	277
Net increase (decrease) in cash and cash equivalents			(714)	(3,758)	(4,348)
Cash and cash equivalents at beginning of period			14,191	17,949	22,297
Cash and cash equivalents at end of period			$ 13,477	$ 14,191	$ 17,949

Cash Flow Information - Cash Fl

Cash Flow Information - Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Cash paid for income taxes	$ 26,464	$ 27,191	$ 8,698
Cash paid for interest	$ 36,085	$ 21,899	$ 0

Cash Flow Information - Supplem

Cash Flow Information - Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Cash required by operating leases	$ 12,026
Finance leases - interest	439
Finance leases - principal	5,555
Operating lease additions	38,225
Finance lease additions	$ 6,412
Capital lease additions		$ 4,400	$ 4,600

Cash Flow Information - Narrati

Cash Flow Information - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended			12 Months Ended
	Dec. 31, 2019	Mar. 31, 2019	Oct. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Inventory transferred into property, plant, and equipment				$ 75,700	$ 97,000
Proceeds from sale of business			$ 2,500		2,473	$ 0
Gain on disposition of business			$ 1,300	(2,500)
Assets Leased to Others
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Expenditures for assets expected to be placed in lease asset program				16,000	$ 26,700	$ 14,500
Production & Automation Technologies
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business	$ 800	$ 2,100
Gain on disposition of business				$ 600

Subsequent Events (Details)

Subsequent Events (Details) - USD ($)	Feb. 14, 2020	Dec. 31, 2019
Term Loan Facility
Subsequent Event [Line Items]
Aggregate amount of debt		$ 265,000,000
Amended Credit Agreement | Revolving Credit Facility | Subsequent Event
Subsequent Event [Line Items]
Maximum borrowing capacity	$ 150,000,000
Amended Credit Agreement | Term Loan Facility | Subsequent Event
Subsequent Event [Line Items]
Aggregate amount of debt	$ 537,000,000

Selected Quarterly Financial _3

Selected Quarterly Financial Data (Unaudited) - Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	May 09, 2018	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, 2019		Dec. 31, 2018		Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenue		$ 247,748	$ 276,839	$ 306,170	$ 300,494	$ 313,133	$ 316,171	$ 305,747	$ 283,105	$ 1,131,251		$ 1,218,156		$ 1,010,466
Gross profit		72,634	92,699	108,760	103,011	106,595	112,327	104,090	93,992	377,104		417,004		320,068
Net income		(1,574)	11,588	23,008	19,938	23,347	24,015	21,879	23,950	52,960		93,191		110,519
Net income (loss) attributable to Apergy		$ (1,823)	$ 11,394	$ 22,937	$ 19,656	$ 23,187	$ 23,961	$ 21,816	$ 23,773	$ 52,164		$ 92,737		$ 109,589
Basic earnings per share attributable to Apergy (in dollars per share)		$ (0.02)	$ 0.15	$ 0.30	$ 0.25	$ 0.30	$ 0.31	$ 0.28	$ 0.31	$ 0.67	[1]	$ 1.20	[1]	$ 1.42	[1]
Diluted earnings per share attributable to Apergy (in dollars per share)		$ (0.02)	$ 0.15	$ 0.30	$ 0.25	$ 0.30	$ 0.31	$ 0.28	$ 0.31	$ 0.67	[1]	$ 1.19	[1]	$ 1.41	[1]
Issuance of common stock at the Separation (in shares)	77,339,828
[1]	See Note 4—Earnings Per Share .

Selected Quarterly Financial _4

Selected Quarterly Financial Data (Unaudited) - Schedule of Revisions to Previously Issued Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	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, 2019		Dec. 31, 2018		Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue	$ 247,748	$ 276,839	$ 306,170	$ 300,494	$ 313,133	$ 316,171	$ 305,747	$ 283,105	$ 1,131,251		$ 1,218,156		$ 1,010,466
Gross profit	72,634	92,699	108,760	103,011	106,595	112,327	104,090	93,992	377,104		417,004		320,068
Net income	(1,574)	11,588	23,008	19,938	23,347	24,015	21,879	23,950	52,960		93,191		110,519
Net income attributable to Apergy	$ (1,823)	$ 11,394	$ 22,937	$ 19,656	$ 23,187	$ 23,961	$ 21,816	$ 23,773	$ 52,164		$ 92,737		$ 109,589
Earnings per share attributable to Apergy:
Basic (in dollars per share)	$ (0.02)	$ 0.15	$ 0.30	$ 0.25	$ 0.30	$ 0.31	$ 0.28	$ 0.31	$ 0.67	[1]	$ 1.20	[1]	$ 1.42	[1]
Diluted (in dollars per share)	$ (0.02)	$ 0.15	$ 0.30	$ 0.25	$ 0.30	$ 0.31	$ 0.28	$ 0.31	$ 0.67	[1]	$ 1.19	[1]	$ 1.41	[1]
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue		$ 278,381	$ 306,054	$ 301,691	$ 311,202	$ 316,468	$ 305,850	$ 283,126			$ 1,216,646		$ 1,010,466
Gross profit		91,519	109,769	105,549	105,271	113,734	103,679	93,615			416,299		320,476
Net income		10,419	23,850	22,569	22,732	25,496	22,075	24,194			94,495		112,664
Net income attributable to Apergy		$ 10,225	$ 23,779	$ 22,287	$ 22,571	$ 25,264	$ 22,154	$ 24,052			$ 94,041		$ 111,734
Earnings per share attributable to Apergy:
Basic (in dollars per share)		$ 0.13	$ 0.31	$ 0.29	$ 0.29	$ 0.33	$ 0.29	$ 0.31			$ 1.22		$ 1.44
Diluted (in dollars per share)		$ 0.13	$ 0.31	$ 0.29	$ 0.29	$ 0.33	$ 0.28	$ 0.31			$ 1.21		$ 1.43
Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue		$ (1,542)	$ 116	$ (1,197)	$ 1,931	$ (297)	$ (103)	$ (21)			$ 1,510		$ 0
Gross profit		1,180	(1,009)	(2,538)	1,324	(1,407)	411	377			705		(408)
Net income		1,169	(842)	(2,631)	615	(1,481)	(196)	(244)			(1,304)		(2,145)
Net income attributable to Apergy		$ 1,169	$ (842)	$ (2,631)	$ 616	$ (1,303)	$ (338)	$ (279)			$ (1,304)		$ (2,145)
Earnings per share attributable to Apergy:
Basic (in dollars per share)		$ 0.02	$ (0.01)	$ (0.04)	$ 0.01	$ (0.02)	$ (0.01)	$ 0			$ (0.02)		$ (0.02)
Diluted (in dollars per share)		$ 0.02	$ (0.01)	$ (0.04)	$ 0.01	$ (0.02)	$ 0	$ 0			$ (0.02)		$ (0.02)
[1]	See Note 4—Earnings Per Share .

Schedule II - Valuation and Q_2

Schedule II - Valuation and Qualifying Accounts - Allowance for Doubtful Accounts (Details) - Allowance for Doubtful Accounts - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year		$ 4,745	$ 4,753	$ 5,634
Charged to Cost and Expense	[1]	4,955	2,007	954
Accounts Written Off		(1,447)	(1,489)	(1,882)
Other		(181)	(526)	47
Balance at end of year		$ 8,072	$ 4,745	$ 4,753
[1]	Net of recoveries on previously reserved or written-off balances.

Schedule II - Valuation and Q_3

Schedule II - Valuation and Qualifying Accounts - Deferred Tax Valuation Allowance (Details) - Deferred Tax Valuation Allowance - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 722	$ 1,280	$ 1,082
Additions	5,556	331	198
Reductions	(251)	(889)	0
Other	0	0	0
Balance at end of year	$ 6,027	$ 722	$ 1,280

Schedule II - Valuation and Q_4

Schedule II - Valuation and Qualifying Accounts - LIFO and Inventory Valuation Adjustments (Details) - LIFO Valuation Adjustments - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 12,867	$ 10,556	$ 9,381
Charged to Cost and Expense	2,922	2,311	1,175
Reductions	0	0	0
Other	0	0	0
Balance at end of year	$ 15,789	$ 12,867	$ 10,556

Uncategorized Items - a20191231

Label	Element	Value
AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (1,315,000)
Net parent investment in Apergy [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 1,315,000