AdvanSix (ASIX) 10-Q 4 May 18 2018 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 01, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	AdvanSix Inc.
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		30,499,327
Amendment Flag	false
Entity Central Index Key	1,673,985
Entity Filer Category	Large Accelerated Filer
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Sales	$ 359,238	$ 376,704
Costs, expenses and other:
Costs of goods sold	321,320	313,896
Selling, general and administrative expenses	19,213	16,770
Other non-operating expense (income), net	3,546	1,797
Costs, expenses and other	344,079	332,463
Income before taxes	15,159	44,241
Income taxes	3,566	16,948
Net income	$ 11,593	$ 27,293
Earnings per common share
Basic (in dollars per share)	$ 0.38	$ 0.90
Diluted (in dollars per share)	$ 0.37	$ 0.88
Weighted average common shares outstanding
Basic (in shares)	30,488,601	30,482,966
Diluted (in shares)	31,285,365	30,894,254

CONDENSED CONSOLIDATED STATEME3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 11,593	$ 27,293
Foreign exchange translation adjustment	(1)	(1)
Pension obligation adjustments	410	0
Other comprehensive income (loss), net of tax	409	(1)
Comprehensive income	$ 12,002	$ 27,292

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 29,352	$ 55,432
Accounts and other receivables – net	162,910	196,003
Inventories – net	124,635	129,208
Other current assets	5,690	7,130
Total current assets	322,587	387,773
Property, plant and equipment – net	615,498	612,612
Goodwill	15,005	15,005
Other assets	37,391	34,884
Total assets	990,481	1,050,274
Current liabilities:
Accounts payable	195,699	227,711
Accrued liabilities	25,382	35,013
Income taxes payable	817	1
Deferred income and customer advances	17,126	17,194
Line of credit – short-term	37,600	0
Current portion of long-term debt	0	16,875
Total current liabilities	276,624	296,794
Deferred income taxes	94,017	92,276
Line of credit – long-term	192,400	0
Long-term debt	0	248,339
Postretirement benefit obligations	33,629	33,396
Other liabilities	3,983	3,144
Total liabilities	600,653	673,949
COMMITMENTS AND CONTINGENCIES (Note 9)
STOCKHOLDERS' EQUITY
Common stock, par value $0.01; 200,000,000 shares authorized; 30,508,322 shares issued and 30,499,327 outstanding at March 31, 2018; 30,482,966 shares issued and outstanding at December 31, 2017	305	305
Preferred stock, par value $0.01; 50,000,000 shares authorized and 0 shares issued and outstanding at March 31, 2018 and December 31, 2017	0	0
Treasury stock at cost (8,995 shares at March 31, 2018; 0 shares at December 31, 2017)	0	0
Additional paid-in capital	264,992	263,081
Retained earnings	133,168	121,985
Accumulated other comprehensive loss	(8,637)	(9,046)
Total stockholders' equity	389,828	376,325
Total liabilities and stockholders' equity	$ 990,481	$ 1,050,274

CONDENSED CONSOLIDATED BALANCE5

CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Common stock par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	30,508,322	30,482,966
Common stock, shares outstanding (in shares)	30,499,327	30,482,966
Preferred stock par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Treasury stock (in shares)	8,995	0

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 11,593	$ 27,293
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	12,542	11,296
Loss on disposal of assets	311	534
Deferred income taxes	1,741	11,706
Stock based compensation	2,281	1,684
Accretion of deferred financing fees	1,480	148
Changes in assets and liabilities:
Accounts and other receivables	33,092	(36,295)
Inventories	4,573	16,941
Accounts payable	(16,468)	(176)
Income taxes payable	816	5,152
Accrued liabilities	(9,631)	(2,823)
Deferred income and customer advances	(68)	(5,860)
Other assets and liabilities	1,805	1,606
Net cash provided by operating activities	44,067	31,206
Cash flows from investing activities:
Expenditures for property, plant and equipment	(30,713)	(33,214)
Other investing activities	(1,002)	(121)
Net cash used for investing activities	(31,715)	(33,335)
Cash flows from financing activities:
Payment of long-term debt	(266,625)	0
Borrowings from line of credit	246,000	167,500
Payments of line of credit	(16,000)	(167,500)
Payment of line of credit fees	(1,362)	0
Principal payments under capital lease	(75)	(42)
Purchase of treasury shares	(370)	0
Net cash used for financing activities	(38,432)	(42)
Net decrease in cash and cash equivalents	(26,080)	(2,171)
Cash and cash equivalents at beginning of period	55,432	14,199
Cash and cash equivalents at the end of period	29,352	12,028
Supplemental non-cash investing activities:
Capital expenditures included in accounts payable	9,753	14,295
Supplemental cash investing activities:
Cash paid for interest	1,777	2,434
Cash paid for income taxes	$ 179	$ 0

Organization, Operations and Ba

Organization, Operations and Basis of Presentation	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Organization, Operations and Basis of Presentation	Organization, Operations and Basis of Presentation Description of Business AdvanSix Inc. (“AdvanSix”, the “Company”, "we" or "our") is an integrated manufacturer of Nylon 6, a polymer resin which is a synthetic material used by our customers to produce engineered plastics, fibers, filaments and films that, in turn, are used in such end-products as automotive and electronic components, carpets, sports apparel, fishing nets and food and industrial packaging. As a result of our backward integration and the configuration of our manufacturing facilities, we also sell a variety of other products, all of which are produced as part of our integrated Nylon 6 resin manufacturing process including caprolactam, ammonium sulfate fertilizers, acetone and other chemical intermediates. Separation from Honeywell On October 1, 2016, Honeywell International Inc. (“Honeywell”) completed the separation of AdvanSix. The separation was completed by Honeywell distributing (the “Distribution”) all of the then outstanding shares of common stock of AdvanSix on October 1, 2016 (the “Distribution Date”) through a dividend in kind of AdvanSix common stock, par value $0.01 , to holders of Honeywell common stock as of the close of business on the record date of September 16, 2016 who held their shares through the Distribution Date (the “Spin-Off”). Each Honeywell stockholder who held their shares through the Distribution Date received one share of AdvanSix common stock for every 25 shares of Honeywell common stock held at the close of business on the record date of September 16, 2016. We filed our Form 10 describing the Spin-Off with the Securities and Exchange Commission (the “SEC”), which was declared effective by the SEC on September 8, 2016 (the “Form 10”). On October 3, 2016, AdvanSix stock began “regular-way” trading on the New York Stock Exchange under the “ASIX” stock symbol. Basis of Presentation The Condensed Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and with the instructions to Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of management, the accompanying unaudited Condensed Consolidated Financial Statements contain all adjustments, consisting of only normal recurring adjustments, necessary for a fair statement of its financial position as of March 31, 2018, and its results of operations and cash flows for the three months ended March 31, 2018 and 2017. The Condensed Consolidated Balance Sheet at December 31, 2017 was derived from audited annual financial statements but does not contain all of the footnote disclosures from the annual financial statements. The results of operations of any interim period are not necessarily indicative of the results of operations to be expected for the full fiscal year. These financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2017. All intercompany transactions have been eliminated. In preparing these Condensed Consolidated Financial Statements, the Company has evaluated events and transactions for potential recognition or disclosure through the date that the Condensed Consolidated Financial Statements were issued. Certain prior period amounts have been reclassified for consistency with the current period presentation. It is our practice to establish actual quarterly closing dates using a predetermined fiscal calendar, which requires our businesses to close their books on a Saturday in order to minimize the potentially disruptive effects of quarterly closing on our business processes. Historically, the effects of this practice were generally not significant to reported results for any quarter and only existed within a reporting year. In the event that differences in actual closing dates are material to year-over-year comparisons of quarterly or year-to-date results, we will provide the appropriate disclosures. Our actual closing dates for the three months ending March 31, 2018 and 2017 were March 31, 2018 and April 1, 2017, respectively. Liabilities to creditors to whom we have issued checks that remained outstanding at March 31, 2018, and December 31, 2017 aggregated $ 9.3 million and $8.5 million , respectively, and were included in Cash and cash equivalents and Accounts payable in the Condensed Consolidated Balance Sheets.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements The Company considers the applicability and impact of all Accounting Standards Updates (“ASUs”). ASUs not discussed below were assessed and determined to be either not applicable or are expected to have minimal impact on our consolidated financial position or results of operations. In February 2018, the Financial Accounting Standards Board (“FASB”) issued ASU 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220), Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, that allows companies to reclassify to Retained earnings the stranded tax effects in Accumulated other comprehensive income ("AOCI") resulting from the Tax Cuts and Jobs Act (the "Tax Act"). The amendments in ASU 2018-02 are effective for all entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption of the amendments in this update is permitted, including adoption in any interim period. The Company elected to early adopt this guidance effective January 1, 2018 and to reclassify the stranded tax effects from the Tax Act from AOCI to Retained earnings (see Note 10). In March 2017, the FASB issued ASU 2017-07, Compensation – Retirement Benefits (Topic 715) in order to improve the presentation of net periodic pension and postretirement costs. The amendment requires that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost as defined in paragraphs 715-30-35-4 and 715-60-35-9 are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations, if one is presented. The amendments in this ASU also allow only the service cost component to be eligible for capitalization when applicable. The amendments in this update related to income statement activity were applied retrospectively whereas balance sheet activity was applied prospectively. For public business entities, the effective date for ASU 2017-07 was annual periods beginning after December 15, 2017, including interim periods within those annual periods. Early adoption is permitted within the first interim period. The Company adopted this guidance effective January 1, 2018 and there was no impact on the Company’s consolidated financial position and results of operations upon adoption other than pension expense reclassifications in the 2017 Consolidated Statement of Operations which reduced Cost of goods sold and Selling, general and administrative expenses and increased Other non-operating expense (income), net. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) , which requires lessees to recognize most leases on their balance sheets related to the rights and obligations created by those leases. The new standard also requires disclosures to help financial statement users better understand the amount, timing, and uncertainty of cash flows arising from leases and will be effective for interim and annual periods beginning after December 15, 2018 (early adoption is permitted). The new standard should be applied under a modified retrospective approach. We continue to evaluate the impact of the new standard on the Company’s consolidated financial position, results of operations and related disclosures. Although we have not yet completed our assessment, adoption of this standard will have a significant impact on the Consolidated Balance Sheets. However, we do not expect adoption of this standard to have a significant impact on the recognition, measurement or presentation of lease expenses within the Consolidated Statements of Operations or the Consolidated Statements of Cash Flows. Information about our undiscounted future lease payments and the timing of those payments is provided under “Contractual Obligations” in Management’s Discussion and Analysis of Financial Condition and Results of Operations in the 2017 Form 10-K. The Company plans to adopt this standard effective January 1, 2019. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) , which replaced the existing accounting standards for revenue recognition with a single comprehensive five-step model eliminating industry-specific accounting rules. The core principle is to recognize revenue upon the transfer of goods or services to customers at an amount that reflects the consideration expected to be received. Since its issuance, the FASB amended several aspects of the new guidance, including provisions that address revenue recognition associated with the licensing of intellectual property. The provisions of ASU 2014-09 became effective for public business entities for interim and annual periods beginning after December 15, 2017. The Company adopted this standard effective January 1, 2018 using the modified retrospective method of transition and there was no cumulative impact adjustment recorded in the Company’s Consolidated Financial Position and Results of Operations. Under this standard, revenue recognition from the Company's products remained unchanged from the Company's previous revenue recognition model. As a result of adopting this standard, the Company expanded its revenue recognition disclosures (see Note 3).

Revenues

Revenues	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenues	Revenues Revenue Recognition The Company recognizes revenue upon the transfer of goods or services to customers at amounts that reflect the consideration expected to be received. AdvanSix primarily recognizes revenues when title transfers from the Company to the customer. Outbound shipping costs incurred by the Company are not included in revenues but are reflected as freight expense in Costs of goods sold in the Consolidated Statements of Operations. Globally, we serve more than 500 customers in a wide variety of industries located in more than 40 countries on an annual basis. In the three months ended March 31, 2018 and 2017, the Company's 10 largest customers accounted for approximately 47% and 43% of total sales, respectively. We typically sell to customers under contracts, with one - to two -year terms on average, or by purchase orders. We have historically experienced low customer turnover. Each of the Company’s product lines represented the following approximate percentage of total sales for the three months ended March 31, 2018 and 2017: Three Months Ended 2018 2017 Nylon 28% 29% Caprolactam 18% 21% Ammonium Sulfate Fertilizers 19% 18% Chemical Intermediates 35% 32% The Company's revenues by geographic area for the three months ended March 31, 2018 and 2017 were as follows: Three Months Ended 2018 2017 United States $ 297,648 $ 300,049 International 61,590 76,655 Total $ 359,238 $ 376,704 Deferred Income and Customer Advances The Company defers revenues when cash payments are received in advance of our performance. Customer advances relate primarily to sales from the ammonium sulfate business. Below is a roll-forward of Deferred Income and Customer Advances for the three months ended March 31, 2018: Opening balance January 1, 2018 $ 17,194 Additional cash advances 2,107 Less amounts recognized in revenues (2,175 ) Ending balance March 31, 2018 $ 17,126 The Company expects to recognize as revenue the March 31, 2018 ending balance of Deferred Income and Customer Advances within one year or less. Practical Expedients There were several practical expedients in ASU 2014-09 which the Company utilized upon adoption including the elections to avoid both assessing whether a contract has a significant financing component and capitalizing incremental costs of obtaining a contract.

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The computation of basic and diluted earnings per share ("EPS") is based on net income divided by the basic weighted average number of common shares and diluted weighted average number of common shares, respectively. The details of the basic and diluted EPS calculations for the three months ended March 31, 2018 and 2017 were as follows: Three Months Ended 2018 2017 Basic Net Income $ 11,593 $ 27,293 Weighted average common shares outstanding 30,488,601 30,482,966 EPS – Basic $ 0.38 $ 0.90 Diluted Dilutive effect of unvested equity awards and other stock-based holdings 796,764 411,288 Weighted average common shares outstanding 31,285,365 30,894,254 EPS – Diluted $ 0.37 $ 0.88 The diluted EPS calculations exclude the effect of stock options when the options’ assumed proceeds exceed the average market price of the common shares during the period. For the three months ended March 31, 2018 and 2017, the weighted average number of stock options excluded from the computations were 53,117 and 72,070 , respectively. On March 2, 2018, the Company granted equity awards representing 231,162 shares of common stock under the 2016 Stock Incentive Plan of AdvanSix Inc. and its Affiliates to Company employees consisting of 128,777 stock options, 58,078 performance stock units (at target) and 44,307 restricted stock units. These equity awards have a per share strike price or grant date fair value per share of $ 41.97 with vesting periods ranging from 12 to 36 months. In September 2017, the Board adopted the AdvanSix Inc. Deferred Compensation Plan (the “DCP”), effective January 1, 2018. Pursuant to the DCP, our directors may elect to defer their cash retainer fees and allocate their deferrals to the AdvanSix stock unit fund. Each unit allocated under the stock unit fund represents the economic equivalent of one share of common stock. Units are paid out in shares of AdvanSix Inc. common stock upon distribution. On March 15, 2018, a total of 3,012 units were allocated to the AdvanSix stock unit fund under the DCP.

Accounts and Other Receivables

Accounts and Other Receivables - Net	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Accounts and Other Receivables - Net	Accounts and Other Receivables – Net March 31, 2018 December 31, 2017 Accounts receivables $ 162,676 $ 188,477 Other 1,801 8,936 Total accounts and other receivables 164,477 197,413 Less – allowance for doubtful accounts (1,567 ) (1,410 ) Total accounts and other receivables – net $ 162,910 $ 196,003 The decrease in Total accounts and other receivables – net at March 31, 2018 versus December 31, 2017 was due primarily to increased collections during the three months ended March 31, 2018 related to a trade receivables discount arrangement with a third-party financial institution, enhancing liquidity and enabling the Company to efficiently manage its working capital needs, as well as lower sales and the collection of a Federal income tax refund.

Inventories

Inventories	3 Months Ended
	Mar. 31, 2018
Inventory Disclosure [Abstract]
Inventories	Inventories March 31, 2018 December 31, 2017 Raw materials $ 38,093 $ 48,502 Work in progress 57,025 50,511 Finished goods 34,425 35,430 Spares and other 23,563 23,091 153,106 157,534 Reduction to LIFO cost basis (28,471 ) (28,326 ) Total inventories – net $ 124,635 $ 129,208 The decrease in Total inventories – net as of March 31, 2018 compared to December 31, 2017 is due primarily to lower levels of raw materials driven by the timing of cumene deliveries at March 31, 2018 and December 31, 2017.

Long-term Debt and Credit Agree

Long-term Debt and Credit Agreement	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Long-term Debt and Credit Agreement	Long-term Debt and Credit Agreement The Company’s debt at March 31, 2018 consisted of the following: Total term loan outstanding $ — Amounts outstanding under the Revolving Credit Facility 230,000 Total outstanding indebtedness 230,000 Less: Line of credit – short-term (37,600 ) Line of credit – long-term $ 192,400 At March 31, 2018 , the Company assessed the amount recorded under the Revolving Credit Facility (defined below) and determined that such amounts approximate fair value. The fair values of the debt are based on quoted inactive market prices and are therefore classified as Level 2 within the valuation hierarchy. In accordance with ASC 470, “Debt,” a short-term obligation that will be refinanced with successive short-term obligations may be classified as noncurrent as long as the cumulative period covered by the financing agreement is uninterrupted and extends beyond one year. In addition, a short-term obligation shall be excluded from current liabilities if the entity has both the intention and ability to refinance the obligation on a long-term basis. Accordingly, the outstanding balances under the Revolving Credit Agreement are classified as $37.6 million as short-term and $192.4 million as long-term. The amount included in Line of credit - short-term, noted above and included on the accompanying Condensed Consolidated Balance Sheet, represents the outstanding balance the Company anticipates paying within one year. Credit Agreement On February 21, 2018 (the “Amendment Date”), the Company entered into Amendment No. 1 (the “Amendment”) to the Credit Agreement, dated September 30, 2016 (the “Original Credit Agreement”), among the Company, the guarantors, the lenders party thereto and Bank of America, N.A., as administrative agent (the Original Credit Agreement, after giving effect to the Amendment, the “Amended and Restated Credit Agreement”). The credit facilities under the Original Credit Agreement consisted of a senior secured term loan in an aggregate principal amount of $270 million , of which $267 million was outstanding just prior to entering into the Amendment, and a senior secured revolving credit facility in a principal amount of $155 million . Pursuant to the Amendment, (i) the term loan facility under the Original Credit Agreement was terminated and the entire outstanding balance of the term loan facility (the “Term Loan”) thereunder was paid in full and (ii) the maximum aggregate principal amount of the senior secured revolving credit facility (the “Revolving Credit Facility”) was increased to $425 million . On the Amendment Date, the Company borrowed $242 million under the Revolving Credit Facility. The proceeds of such loans, as well as cash on hand, were used to repay the outstanding term loan facility under the Original Credit Agreement. The Revolving Credit Facility under the Amended and Restated Credit Agreement has a 5 -year term with a scheduled maturity date of February 21, 2023. The Amendment resulted in an increase in the Revolving Credit Facility to replace the Term Loan and provides increased borrowing flexibility and reduced overall borrowing costs with an approximate 50 basis point reduction in the interest rate spread. The Amended and Restated Credit Agreement permits the Company to utilize up to $40 million of the Revolving Credit Facility for the issuance of letters of credit and up to $40 million for swing line loans. The Company has the option to incur incremental term loans and/or increase the amount of the Revolving Credit Facility in an aggregate principal amount for all such incremental term loans and increases of the Revolving Credit Facility of up to the sum of (x) $175 million plus (y) an amount such that the Company’s Consolidated Senior Secured Leverage Ratio (as defined in the Amended and Restated Credit Agreement) would not be greater than 1.75 to 1.00, in each case, to the extent that any one or more lenders, whether or not currently party to the Amended and Restated Credit Agreement, commits to be a lender for such amount. Borrowings under the Amended and Restated Credit Agreement bear interest at a rate equal to either the sum of a base rate plus a margin ranging from 0.50% to 1.50% or the sum of a Eurodollar rate plus a margin ranging from 1.50% to 2.50% , with either such margin varying according to the Company’s Consolidated Leverage Ratio (as defined in the Amended and Restated Credit Agreement). The Company is also required to pay a commitment fee in respect of unused commitments under the Revolving Credit Facility, if any, at a rate ranging from 0.20% to 0.40% per annum depending on the Company’s Consolidated Leverage Ratio. The initial margin under the Amended and Restated Credit Agreement is 0.75% for base rate loans and 1.75% for Eurodollar rate loans and the initial commitment fee rate is 0.25% per annum. Substantially all domestic tangible and intangible assets of the Company and its subsidiaries are pledged as collateral to secure the obligations under the Amended and Restated Credit Agreement. The Amended and Restated Credit Agreement contains customary covenants limiting the ability of the Company and its subsidiaries to, among other things, pay cash dividends, incur debt or liens, redeem or repurchase stock of the Company, enter into transactions with affiliates, make investments, make capital expenditures, merge or consolidate with others or dispose of assets. The Amended and Restated Credit Agreement also contains financial covenants that require the Company to maintain a Consolidated Interest Coverage Ratio (as defined in the Amended and Restated Credit Agreement) of not less than 3.00 to 1.00 and to maintain a Consolidated Leverage Ratio of (i) 3.50 to 1.00 or less for the fiscal quarter ending March 31, 2018 , through and including the fiscal quarter ending December 31, 2019, (ii) 3.25 to 1.00 or less for the fiscal quarter ending March 31, 2020, through and including the fiscal quarter ending December 31, 2020, (iii) 3.00 to 1.00 or less for the fiscal quarter ending March 31, 2021, through and including the fiscal quarter ending December 31, 2021, and (iv) 2.75 to 1.00 or less for the fiscal quarter ending March 31, 2022 and each fiscal quarter thereafter (subject to the Company’s option to elect a consolidated leverage ratio increase in connection with certain acquisitions). If the Company does not comply with the covenants in the Amended and Restated Credit Agreement, the lenders may, subject to customary cure rights, require the immediate payment of all amounts outstanding under the Revolving Credit Facility. In addition to the amount borrowed on the Amendment Date, as noted above, the Company borrowed an incremental $4 million for working capital purposes under the Revolving Credit Facility and subsequently repaid $16 million to bring the balance under the Revolving Credit Facility to $230 million at March 31, 2018 . The Company had approximately $11.8 million of letter of credit agreements outstanding at March 31, 2018 , of which $10.5 million are bi-lateral letters of credit and $1.3 million are provided to the Company under the Revolving Credit Facility.

Postretirement Benefit Obligati

Postretirement Benefit Obligations	3 Months Ended
	Mar. 31, 2018
Retirement Benefits [Abstract]
Postretirement Benefit Cost	Postretirement Benefit Cost The components of net periodic benefit cost of the Company’s pension plan are as follows: Three Months Ended March 31, 2018 2017 Service costs $ 2,001 $ 1,908 Interest costs 469 333 Expected return on plan assets (287 ) (76 ) Net periodic benefit cost $ 2,183 $ 2,165 The Company plans to make contributions during calendar year 2018 sufficient to satisfy pension funding requirements under the AdvanSix Retirement Earnings Plan in an aggregate amount of approximately $8.0 million and will make additional contributions in future years sufficient to satisfy pension funding requirements in those periods. The Company made contributions of $2.0 million in the first quarter of 2018 and $1.6 million in April 2018. The pension plan assets are invested through a master trust fund. The strategic asset allocation for the trust fund is selected by the Company's Investment Committee reflecting the results of comprehensive asset and liability modeling. The Investment Committee establishes strategic asset allocation percentage targets and appropriate benchmarks for significant asset classes with the aim of achieving a prudent balance between return and risk.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The Company is subject to a number of lawsuits, investigations and disputes (some of which involve substantial amounts claimed) arising out of the conduct of the Company or other third parties in the normal and ordinary course of business, including matters relating to commercial transactions. A liability is recognized for any contingency that is probable of occurrence and reasonably estimable. The Company continually assesses the likelihood of adverse judgments or outcomes in these matters, as well as potential ranges of possible losses (taking into consideration any insurance recoveries), based on an analysis of each matter with the assistance of legal counsel and, if applicable, other experts. Given the uncertainty inherent in such lawsuits, investigations and disputes, the Company does not believe it is possible to develop estimates of reasonably possible loss in excess of current accruals for these matters. Considering the Company’s past experience and existing accruals, the Company does not expect the outcome of these matters, either individually or in the aggregate, to have a material adverse effect on the Company’s consolidated financial position, results of operations or cash flows. Potential liabilities are subject to change due to new developments, changes in settlement strategy or the impact of evidentiary requirements, which could cause the Company to pay damage awards or settlements (or become subject to equitable remedies) that could have a material adverse effect on the Company’s consolidated results of operations, balance sheet and/or operating cash flows in the periods recognized or paid. On March 13, 2018, a federal search warrant was executed at the Company’s Hopewell, Virginia manufacturing facility. On the same date, the Company was separately served with a grand jury subpoena issued by the U.S. District Court for the Eastern District of Virginia, which requested documents related to the Hopewell facility’s air emissions and its compliance with the terms of a previously disclosed 2013 consent decree with the federal government and the Commonwealth of Virginia. While the Company is still working to determine the exact reason and nature of these actions, it is cooperating fully with the authorities and is providing information in response to the subpoena. The Company’s production across its sites was not affected by these events and the Company expects to continue operating safely at plan moving forward. While the Company may incur penalties or fines in connection with the federal inquiry, the amount of such penalties or fines, if any, cannot be reasonably estimated at this time. Following the Spin-Off, the Company assumed from Honeywell all health, safety and environmental (“HSE”) liabilities and compliance obligations related to the past and future operations of our current business, as well as all HSE liabilities associated with our three current manufacturing locations and the other locations used in our current operations, including any cleanup or other liabilities related to any contamination that may have occurred at such locations in the past. Honeywell retained all HSE liabilities related to former business locations or the operation of our former businesses. Although we have ongoing environmental remedial obligations at certain of our facilities, in the past three years, the associated remediation costs have not been material, and we do not expect our known remediation costs to be material for 2018 .

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s provision for income taxes in interim periods is computed by applying an estimated annual effective tax rate against Income before taxes for the period in addition to recording any tax effects of discrete items for the quarter. For interim reporting purposes, the Company recorded a benefit to the Income taxes of $0.2 million as a discrete item related to excess tax benefits associated with the vesting of restricted stock units in the quarter. The provision for income taxes was $3.6 million and $16.9 million for the three months ended March 31, 2018 and 2017 , respectively. As a result of the early adoption of ASU 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220), Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income , during the three months ended March 31, 2018, the Company elected to reclassify $0.4 million from Accumulated other comprehensive income to Retained earnings. The reclassification results from the remeasurement of deferred taxes pursuant to the Tax Act related to the Company’s pension plan that was recognized as a component of Income taxes related to continuing operations for the year ended December 2017 which was originally recognized in Other comprehensive income. The Company elected the optional transition method and recorded the adjustment at the beginning of the period of adoption of ASU 2018-02. The Company’s current accounting policy related to stranded tax effects in Accumulated other comprehensive income is to review and reclassify on an item by item basis. The Company has not made any adjustments in the quarter related to the financial impacts of the Tax Act recorded as provisional amounts in 2017 under Staff Accounting Bulletin No. 118.

Subsequent Event

Subsequent Event	3 Months Ended
	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On May 4, 2018, the Company announced that its Board of Directors authorized a share repurchase program of up to $75 million of the Company’s common stock. Repurchases may be made from time to time on the open market, including through the use of trading plans intended to qualify under Rule 10b5-1 under the Exchange Act. The size and timing of these repurchases will depend on pricing, market and economic conditions, legal and contractual requirements and other factors. The repurchase program has no expiration date and may be modified, suspended or discontinued at any time. The Company had approximately 30.5 million shares of common stock outstanding as of March 31, 2018.

Recent Accounting Pronounceme18

Recent Accounting Pronouncements (Policies)	3 Months Ended
	Mar. 31, 2018
Accounting Policies, by Policy (Policies) [Line Items]
Basis of Accounting	Basis of Presentation The Condensed Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and with the instructions to Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of management, the accompanying unaudited Condensed Consolidated Financial Statements contain all adjustments, consisting of only normal recurring adjustments, necessary for a fair statement of its financial position as of March 31, 2018, and its results of operations and cash flows for the three months ended March 31, 2018 and 2017. The Condensed Consolidated Balance Sheet at December 31, 2017 was derived from audited annual financial statements but does not contain all of the footnote disclosures from the annual financial statements. The results of operations of any interim period are not necessarily indicative of the results of operations to be expected for the full fiscal year. These financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2017. All intercompany transactions have been eliminated. In preparing these Condensed Consolidated Financial Statements, the Company has evaluated events and transactions for potential recognition or disclosure through the date that the Condensed Consolidated Financial Statements were issued. Certain prior period amounts have been reclassified for consistency with the current period presentation. It is our practice to establish actual quarterly closing dates using a predetermined fiscal calendar, which requires our businesses to close their books on a Saturday in order to minimize the potentially disruptive effects of quarterly closing on our business processes. Historically, the effects of this practice were generally not significant to reported results for any quarter and only existed within a reporting year. In the event that differences in actual closing dates are material to year-over-year comparisons of quarterly or year-to-date results, we will provide the appropriate disclosures. Our actual closing dates for the three months ending March 31, 2018 and 2017 were March 31, 2018 and April 1, 2017, respectively. Liabilities to creditors to whom we have issued checks that remained outstanding at March 31, 2018, and December 31, 2017 aggregated $ 9.3 million and $8.5 million , respectively, and were included in Cash and cash equivalents and Accounts payable in the Condensed Consolidated Balance Sheets.
Accounting Standards Update 2018-02 [Member]
Accounting Policies, by Policy (Policies) [Line Items]
New Accounting Pronouncements	In February 2018, the Financial Accounting Standards Board (“FASB”) issued ASU 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220), Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, that allows companies to reclassify to Retained earnings the stranded tax effects in Accumulated other comprehensive income ("AOCI") resulting from the Tax Cuts and Jobs Act (the "Tax Act"). The amendments in ASU 2018-02 are effective for all entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption of the amendments in this update is permitted, including adoption in any interim period. The Company elected to early adopt this guidance effective January 1, 2018 and to reclassify the stranded tax effects from the Tax Act from AOCI to Retained earnings (see Note 10).
Accounting Standard Update 2017-07 [Member]
Accounting Policies, by Policy (Policies) [Line Items]
New Accounting Pronouncements	In March 2017, the FASB issued ASU 2017-07, Compensation – Retirement Benefits (Topic 715) in order to improve the presentation of net periodic pension and postretirement costs. The amendment requires that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost as defined in paragraphs 715-30-35-4 and 715-60-35-9 are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations, if one is presented. The amendments in this ASU also allow only the service cost component to be eligible for capitalization when applicable. The amendments in this update related to income statement activity were applied retrospectively whereas balance sheet activity was applied prospectively. For public business entities, the effective date for ASU 2017-07 was annual periods beginning after December 15, 2017, including interim periods within those annual periods. Early adoption is permitted within the first interim period. The Company adopted this guidance effective January 1, 2018 and there was no impact on the Company’s consolidated financial position and results of operations upon adoption other than pension expense reclassifications in the 2017 Consolidated Statement of Operations which reduced Cost of goods sold and Selling, general and administrative expenses and increased Other non-operating expense (income), net.
Accounting Standards Update 2016-02 [Member]
Accounting Policies, by Policy (Policies) [Line Items]
New Accounting Pronouncements	In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) , which requires lessees to recognize most leases on their balance sheets related to the rights and obligations created by those leases. The new standard also requires disclosures to help financial statement users better understand the amount, timing, and uncertainty of cash flows arising from leases and will be effective for interim and annual periods beginning after December 15, 2018 (early adoption is permitted). The new standard should be applied under a modified retrospective approach. We continue to evaluate the impact of the new standard on the Company’s consolidated financial position, results of operations and related disclosures. Although we have not yet completed our assessment, adoption of this standard will have a significant impact on the Consolidated Balance Sheets. However, we do not expect adoption of this standard to have a significant impact on the recognition, measurement or presentation of lease expenses within the Consolidated Statements of Operations or the Consolidated Statements of Cash Flows. Information about our undiscounted future lease payments and the timing of those payments is provided under “Contractual Obligations” in Management’s Discussion and Analysis of Financial Condition and Results of Operations in the 2017 Form 10-K. The Company plans to adopt this standard effective January 1, 2019.
Accounting Standards Update 2014-09 [Member]
Accounting Policies, by Policy (Policies) [Line Items]
New Accounting Pronouncements	In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) , which replaced the existing accounting standards for revenue recognition with a single comprehensive five-step model eliminating industry-specific accounting rules. The core principle is to recognize revenue upon the transfer of goods or services to customers at an amount that reflects the consideration expected to be received. Since its issuance, the FASB amended several aspects of the new guidance, including provisions that address revenue recognition associated with the licensing of intellectual property. The provisions of ASU 2014-09 became effective for public business entities for interim and annual periods beginning after December 15, 2017. The Company adopted this standard effective January 1, 2018 using the modified retrospective method of transition and there was no cumulative impact adjustment recorded in the Company’s Consolidated Financial Position and Results of Operations. Under this standard, revenue recognition from the Company's products remained unchanged from the Company's previous revenue recognition model.

Revenues Revenues (Tables)

Revenues Revenues (Tables)	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	Each of the Company’s product lines represented the following approximate percentage of total sales for the three months ended March 31, 2018 and 2017: Three Months Ended 2018 2017 Nylon 28% 29% Caprolactam 18% 21% Ammonium Sulfate Fertilizers 19% 18% Chemical Intermediates 35% 32% The Company's revenues by geographic area for the three months ended March 31, 2018 and 2017 were as follows: Three Months Ended 2018 2017 United States $ 297,648 $ 300,049 International 61,590 76,655 Total $ 359,238 $ 376,704
Summary of Deferred Income and Customer Advances	Below is a roll-forward of Deferred Income and Customer Advances for the three months ended March 31, 2018: Opening balance January 1, 2018 $ 17,194 Additional cash advances 2,107 Less amounts recognized in revenues (2,175 ) Ending balance March 31, 2018 $ 17,126

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Schedule of Earnings Per Share	The details of the basic and diluted EPS calculations for the three months ended March 31, 2018 and 2017 were as follows: Three Months Ended 2018 2017 Basic Net Income $ 11,593 $ 27,293 Weighted average common shares outstanding 30,488,601 30,482,966 EPS – Basic $ 0.38 $ 0.90 Diluted Dilutive effect of unvested equity awards and other stock-based holdings 796,764 411,288 Weighted average common shares outstanding 31,285,365 30,894,254 EPS – Diluted $ 0.37 $ 0.88

Accounts and Other Receivable21

Accounts and Other Receivables - Net (Tables)	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Schedule of Accounts and Other Receivables Net	March 31, 2018 December 31, 2017 Accounts receivables $ 162,676 $ 188,477 Other 1,801 8,936 Total accounts and other receivables 164,477 197,413 Less – allowance for doubtful accounts (1,567 ) (1,410 ) Total accounts and other receivables – net $ 162,910 $ 196,003

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Mar. 31, 2018
Inventory Disclosure [Abstract]
Schedule of Inventory, Current	March 31, 2018 December 31, 2017 Raw materials $ 38,093 $ 48,502 Work in progress 57,025 50,511 Finished goods 34,425 35,430 Spares and other 23,563 23,091 153,106 157,534 Reduction to LIFO cost basis (28,471 ) (28,326 ) Total inventories – net $ 124,635 $ 129,208

Long-term Debt and Credit Agr23

Long-term Debt and Credit Agreement (Tables)	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Schedule of Long-term Debt	The Company’s debt at March 31, 2018 consisted of the following: Total term loan outstanding $ — Amounts outstanding under the Revolving Credit Facility 230,000 Total outstanding indebtedness 230,000 Less: Line of credit – short-term (37,600 ) Line of credit – long-term $ 192,400

Postretirement Benefit Obliga24

Postretirement Benefit Obligations (Tables)	3 Months Ended
	Mar. 31, 2018
Retirement Benefits [Abstract]
Schedule of Net Benefit Costs	The components of net periodic benefit cost of the Company’s pension plan are as follows: Three Months Ended March 31, 2018 2017 Service costs $ 2,001 $ 1,908 Interest costs 469 333 Expected return on plan assets (287 ) (76 ) Net periodic benefit cost $ 2,183 $ 2,165

Organization, Operations and 25

Organization, Operations and Basis of Presentation (Details) $ / shares in Units, $ in Millions	Sep. 16, 2016	Mar. 31, 2018USD ($)$ / shares	Dec. 31, 2017USD ($)$ / shares	Oct. 01, 2016$ / shares
Accounting Policies [Abstract]
Common stock par value (in dollars per share) | $ / shares		$ 0.01	$ 0.01	$ 0.01
Shares received, conversion ratio	0.04
Liabilities to creditors, payments issued but outstanding | $		$ 9.3	$ 8.5

Revenues - Narrative (Details)

Revenues - Narrative (Details)	3 Months Ended
	Mar. 31, 2018countrycustomer	Mar. 31, 2017
Revenue from Contract with Customer [Abstract]
Number of customers | customer	500
Number of countries in which customers are located | country	40
Minimum [Member]
Concentration Risk [Line Items]
Length of contracts	1 year
Maximum [Member]
Concentration Risk [Line Items]
Length of contracts	2 years
10 Largest Customers [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration risk percentage	47.00%	43.00%

Revenues - Disaggregation of Re

Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 359,238	$ 376,704
United States [Member]
Disaggregation of Revenue [Line Items]
Revenues	297,648	300,049
International [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 61,590	$ 76,655
Nylon [Member]
Disaggregation of Revenue [Line Items]
Percentage of sales	28.00%	29.00%
Caprolactam [Member]
Disaggregation of Revenue [Line Items]
Percentage of sales	18.00%	21.00%
Ammonium Sulfate Fertilizers [Member]
Disaggregation of Revenue [Line Items]
Percentage of sales	19.00%	18.00%
Chemical Intermediates [Member]
Disaggregation of Revenue [Line Items]
Percentage of sales	35.00%	32.00%

Revenues - Summary of Deferred

Revenues - Summary of Deferred Revenue and Customer Advances (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Change in Contract with Customer, Liability [Roll Forward]
Opening balance January 1, 2018	$ 17,194
Additional cash advances	2,107
Less amounts recognized in revenues	(2,175)
Ending balance March 31, 2018	$ 17,126

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Basic
Net Income	$ 11,593	$ 27,293
Weighted average common shares outstanding (in shares)	30,488,601	30,482,966
EPS – Basic (in dollars per share)	$ 0.38	$ 0.90
Diluted
Dilutive effect of unvested equity awards and other stock-based holdings (in shares)	796,764	411,288
Weighted average common shares outstanding – Diluted (in shares)	31,285,365	30,894,254
EPS – Diluted (in dollars per share)	$ 0.37	$ 0.88

Earnings Per Share - Narrative

Earnings Per Share - Narrative (Details) - $ / shares	Mar. 02, 2018	Mar. 31, 2018	Mar. 31, 2017	Mar. 15, 2018
Earnings Per Share [Line Items]
Stock options and equity instruments other than options granted in period (in shares)	231,162,000
Exercise price (in dollars per share)	$ 41.97
Number of shares of common stock equal to one unit (in shares)		1
Employee Stock Option [Member]
Earnings Per Share [Line Items]
Weighted average number of stock options excluded form computation of diluted earnings per share (in shares)		53,117,000	72,070,000
Employee Stock Option [Member]
Earnings Per Share [Line Items]
Stock options granted in period (in shares)	128,777,000
Performance Shares [Member]
Earnings Per Share [Line Items]
Equity instruments other than options granted in shares (in shares)	58,078,000
Restricted Stock Units [Member]
Earnings Per Share [Line Items]
Equity instruments other than options granted in shares (in shares)	44,307,000
Minimum [Member]
Earnings Per Share [Line Items]
Vesting period (in months)	12 months
Maximum [Member]
Earnings Per Share [Line Items]
Vesting period (in months)	36 months
Deferred Compensation, Share-based Payments [Member]
Earnings Per Share [Line Items]
Number of units allocated to deferred compensation plan (in shares)				3,012

Accounts and Other Receivable31

Accounts and Other Receivables - Net (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Accounts receivables	$ 162,676	$ 188,477
Other	1,801	8,936
Total accounts and other receivables	164,477	197,413
Less – allowance for doubtful accounts	(1,567)	(1,410)
Total accounts and other receivables – net	$ 162,910	$ 196,003

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 38,093	$ 48,502
Work in progress	57,025	50,511
Finished goods	34,425	35,430
Spares and other	23,563	23,091
Inventory gross	153,106	157,534
Reduction to LIFO cost basis	(28,471)	(28,326)
Total inventories – net	$ 124,635	$ 129,208

Long-term Debt and Credit Agr33

Long-term Debt and Credit Agreement - Summary of Company's Debt (Details) $ in Thousands	Mar. 31, 2018USD ($)
Debt Instrument [Line Items]
Total outstanding indebtedness	$ 230,000
Less: Line of credit – short-term	(37,600)
Line of credit – long-term	192,400
Term Loan [Member]
Debt Instrument [Line Items]
Total outstanding indebtedness	0
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total outstanding indebtedness	230,000
Less: Line of credit – short-term	(37,600)
Line of credit – long-term	$ 192,400

Long-term Debt and Credit Agr34

Long-term Debt and Credit Agreement - Narrative (Details)	Feb. 21, 2018USD ($)	Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)	Feb. 20, 2018USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2016USD ($)
Debt Instrument [Line Items]
Line of credit, short term		$ 37,600,000
Line of credit, long term		192,400,000
Long-term line of credit		230,000,000
Proceeds from lines of credit		246,000,000	$ 167,500,000
Percentage decrease in overall borrowing costs	0.50%
Line of credit facility, accordion feature, higher borrowing capacity option	$ 175,000,000
Repayments of lines of credit		16,000,000	$ 167,500,000
Letter of credit agreements outstanding		37,600,000			$ 0
Bi-lateral Letter of Credit Agreements [Member]
Debt Instrument [Line Items]
Letter of credit agreements outstanding		10,500,000
Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal amount						$ 270,000,000
Long-term line of credit				$ 267,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal amount						$ 155,000,000
Letter of credit agreements outstanding		1,300,000
Amended and Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, covenant, consolidated senior secured leverage ratio, maximum	1.75
Debt instrument, covenant, consolidated interest coverage ratio, minimum	3
Debt instrument, covenant, consolidated leverage ratio, scenario one, maximum	3.50
Debt instrument, covenant, consolidated leverage ratio, scenario two, maximum	3.25
Debt instrument, covenant, consolidated leverage ratio, scenario three, maximum	3
Debt instrument, covenant, consolidated leverage ratio, scenario four, maximum	2.75
Letter of Credit [Member]
Debt Instrument [Line Items]
Letter of credit agreements outstanding		11,800,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit, short term		37,600,000
Line of credit, long term		192,400,000
Long-term line of credit		230,000,000
Proceeds from lines of credit	$ 242,000,000
Debt instrument, term	5 years
Additional borrowings from line of credit		4,000,000
Repayments of lines of credit		$ 16,000,000
Revolving Credit Facility [Member] | Senior Secured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 425,000,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	40,000,000
Bridge Loan [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 40,000,000
Minimum [Member] | Amended and Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Commitment fee percentage	0.20%
Maximum [Member] | Amended and Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Commitment fee percentage	0.40%
Base Rate [Member] | Amended and Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.75%
Base Rate [Member] | Minimum [Member] | Amended and Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.50%
Base Rate [Member] | Maximum [Member] | Amended and Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.50%
Eurodollar [Member] | Amended and Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.75%
Commitment fee percentage	0.25%
Eurodollar [Member] | Minimum [Member] | Amended and Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.50%
Eurodollar [Member] | Maximum [Member] | Amended and Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.50%

Postretirement Benefit Obliga35

Postretirement Benefit Obligations - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Retirement Benefits [Abstract]
Service costs	$ 2,001	$ 1,908
Interest costs	469	333
Expected return on plan assets	(287)	(76)
Net periodic benefit cost	$ 2,183	$ 2,165

Postretirement Benefit Obliga36

Postretirement Benefit Obligations - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 30, 2018	Mar. 31, 2018	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pension contributions		$ 2
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pension contributions	$ 1.6		$ 8

Commitments and Contingencies C

Commitments and Contingencies Commitments and Contingencies (Details)	3 Months Ended
	Mar. 31, 2018location
Commitments and Contingencies Disclosure [Abstract]
Number of manufacturing locations	3

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income taxes	$ 3,566	$ 16,948
Valuation Allowance [Line Items]
Income tax benefit related to excess tax benefits associated with vesting of RSUs	200
Retained Earnings [Member] | Accounting Standards Update 2018-02 [Member]
Valuation Allowance [Line Items]
Deferred tax benefit reclassified from AOCI to Retained Earnings	400
AOCI Attributable to Parent [Member] | Accounting Standards Update 2018-02 [Member]
Valuation Allowance [Line Items]
Deferred tax benefit reclassified from AOCI to Retained Earnings	$ (400)

Subsequent Event (Details)

Subsequent Event (Details) - USD ($)	May 04, 2018	Mar. 31, 2018	Dec. 31, 2017
Subsequent Event [Line Items]
Common stock, shares outstanding (in shares)		30,499,327	30,482,966
Subsequent Event
Subsequent Event [Line Items]
Share repurchase program, maximum amount of shares authorized to be repurchased	$ 75,000,000