Simpson Manufacturing (SSD) 10-K 27 Feb 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 26, 2019	Jun. 30, 2018
Document and Entity Information
Entity Registrant Name	SIMPSON MANUFACTURING CO INC /CA/
Entity Central Index Key	920,371
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 2,869,585,657
Entity Common Stock, Shares Outstanding		44,842,697
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 160,180	$ 168,514
Trade accounts receivable, net	146,052	135,958
Inventories	276,088	252,996
Other current assets	17,209	26,473
Total current assets	599,529	583,941
Property, plant and equipment, net	254,597	273,020
Goodwill	130,250	137,140
Equity investment (see Note 11)	2,487	2,549
Intangible assets, net	24,402	29,326
Other noncurrent assets	10,398	11,547
Total assets	1,021,663	1,037,523
Current liabilities
Trade accounts payable	34,361	31,536
Accrued liabilities	98,572	88,485
Accrued profit sharing trust contributions	7,804	7,054
Accrued cash profit sharing and commissions	10,843	9,416
Total current liabilities	151,580	136,491
Deferred income tax and other long-term liabilities	14,569	16,254
Total liabilities	166,149	152,745
Commitments and contingencies (see Note 14)
Stockholders’ equity
Preferred stock, par value $0.01; authorized shares, 5,000; issued and outstanding shares, none	0	0
Common stock, par value $0.01; authorized shares, 160,000; issued and outstanding shares, 44,998, and 46,745 at December 31, 2018 and 2017, respectively	453	473
Additional paid-in capital	276,504	260,157
Retained earnings	628,207	676,644
Treasury stock	(25,000)	(40,000)
Accumulated other comprehensive loss	(24,650)	(12,496)
Total stockholders’ equity	855,514	884,778
Total liabilities and stockholders’ equity	$ 1,021,663	$ 1,037,523

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized shares	5,000	5,000
Preferred stock, issued shares	0	0
Preferred stock, outstanding shares	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	160,000,000	160,000,000
Common stock, issued shares	44,998,000	46,745,000
Common stock, outstanding shares	44,998,000	46,745,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net sales	$ 1,078,809	$ 977,025	$ 860,661
Cost of sales	598,290	533,644	450,781
Gross profit	480,519	443,381	409,880
Operating expenses:
Research and development and other engineering	43,056	47,616	46,248
Selling	109,931	114,903	98,343
General and administrative	159,093	143,107	124,859
Total operating expenses	312,080	305,626	269,450
Net gain on disposal of assets	(10,579)	(160)	(780)
Impairment of goodwill	6,686	0	0
Income from operations	172,332	137,915	141,210
Loss in equity investment, before tax	(63)	(86)	0
Foreign exchange gain (loss), net	430	1,252	(1,733)
Interest Income (Expense), Net	(571)	(788)	(577)
Gain on bargain purchase of a business	0	(6,336)	0
Loss on disposal of a business	0	(211)	0
Income before taxes	172,128	144,418	138,900
Provision for income taxes	45,495	51,801	49,166
Net income	$ 126,633	$ 92,617	$ 89,734
Earnings per share of common stock:
Basic	$ 2.74	$ 1.95	$ 1.87
Diluted	$ 2.72	$ 1.94	$ 1.86
Weighted average number of shares of common stock outstanding
Basic (in shares)	46,213	47,486	48,084
Diluted (in shares)	46,540	47,774	48,295

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 126,633	$ 92,617	$ 89,734
Other comprehensive income:
Translation adjustment, net of tax expense of $0, $0 and ($222) for 2018, 2017 and 2016, respectively	(12,911)	21,418	(3,920)
Unamortized pension adjustments, net of tax benefit (expense) of ($59), $37 and $88, for 2018, 2017 and 2016, respectively	376	(944)	(474)
Comprehensive income	$ 114,098	$ 113,091	$ 85,340

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Translation adjustment, net of tax expense of $0, $0 and ($222) for 2018, 2017 and 2016, respectively	$ 0	$ 0	$ (222)
Unamortized pension adjustments, net of tax benefit (expense) of ($59), $37 and $88, for 2018, 2017 and 2016, respectively	$ (59)	$ 37	$ 88

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance at Dec. 31, 2015	$ 849,824	$ 481	$ 238,212	$ 639,707	$ (28,576)
Balance (in shares) at Dec. 31, 2015		48,184
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	89,734			89,734
Translation adjustment, net of tax	(3,920)				(3,920)
Pension adjustment, net of tax	(474)				(474)
Options exercised	7,976	$ 3	7,973
Options exercised (in shares)		270
Stock-based compensation expense	13,186		13,186
Tax benefit of options exercised	251		251
Repurchase of common stock	(53,502)					$ (53,502)
Repurchase of common stock (in shares)		(1,244)
Retirement of common stock	0	$ (13)		(53,489)		53,502
Cash dividends declared on common stock, $0.87 per share	(33,530)			(33,530)
Shares issued from release of restricted stock units	(4,018)	$ 2	(4,020)
Shares issued from release of restricted stock units (in shares)		217
Common stock issued	315		315
Common stock issued (in shares)		10
Balance at Dec. 31, 2016	865,842	$ 473	255,917	642,422	(32,970)
Balance (in shares) at Dec. 31, 2016		47,437
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	92,617			92,617
Translation adjustment, net of tax	21,418				21,418
Pension adjustment, net of tax	(944)				(944)
Options exercised	6,610	$ 3	6,607
Options exercised (in shares)		223
Stock-based compensation expense	12,565		12,565
Tax benefit of options exercised	0		0
Repurchase of common stock	(70,000)		(10,000)			(60,000)
Repurchase of common stock (in shares)		(1,138)
Retirement of common stock	0	$ (5)		(19,995)		20,000
Cash dividends declared on common stock, $0.87 per share	(38,400)			(38,400)
Shares issued from release of restricted stock units	(5,341)	$ 2	(5,343)
Shares issued from release of restricted stock units (in shares)		214
Common stock issued	411		411
Common stock issued (in shares)		9
Balance at Dec. 31, 2017	$ 884,778	$ 473	260,157	676,644	(12,496)	(40,000)
Balance (in shares) at Dec. 31, 2017	46,745	46,745
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting standards	$ 791			410	381
Net income	126,633			126,633
Translation adjustment, net of tax	(12,911)				(12,911)
Pension adjustment, net of tax	376				376
Options exercised	695	$ 0	695
Options exercised (in shares)		23
Stock-based compensation expense	10,334		10,334
Repurchase of common stock	(110,540)		10,000			(120,540)
Repurchase of common stock (in shares)		(1,955)
Retirement of common stock	0	$ (22)		(135,518)		135,540
Cash dividends declared on common stock, $0.87 per share	(39,962)			(39,962)
Shares issued from release of restricted stock units	(5,145)	$ 2	(5,147)
Shares issued from release of restricted stock units (in shares)		177
Common stock issued	465		465
Common stock issued (in shares)		8
Balance at Dec. 31, 2018	$ 855,514	$ 453	$ 276,504	$ 628,207	$ (24,650)	$ (25,000)
Balance (in shares) at Dec. 31, 2018	44,998	44,998

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per share of common stock	$ 0.87	$ 0.81	$ 0.70
Common stock issued, price per share (in dollars per share)	$ 57.41	$ 44.26	$ 32.45

Consolidated Statements of Cash

Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Statement of Cash Flows [Abstract]
Net income	$ 126,633	$ 92,617	$ 89,734
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of assets	(10,579)	(160)	(780)
Depreciation and amortization	39,393	33,724	27,927
Write-off of software development project	0	676	2,212
Loss in equity method investment, before tax	63	86	0
Gain (adjustment) on bargain purchase of a business	0	(6,336)	0
Loss on disposal of a business	0	211	0
Impairment of goodwill	6,686	0	0
Deferred income taxes	4,950	6,299	(869)
Noncash compensation related to stock plans	11,176	13,908	13,946
Excess tax benefit of options exercised and restricted stock units vested	0	0	(273)
Recovery (provision) of doubtful accounts	569	66	(83)
Foreign Currency Transaction Gain, before Tax	1,841	0	0
Changes in operating assets and liabilities, net of effects of acquisitions and dispositions:
Trade accounts receivable	(12,573)	(17,822)	(7,548)
Inventories	(26,425)	(6,580)	(36,617)
Other current assets	5,297	(2,016)	(2,180)
Other noncurrent assets	533	513	336
Trade accounts payable	4,670	1,157	5,785
Accrued liabilities	9,136	10,130	4,290
Accrued profit sharing trust contributions	755	498	757
Accrued cash profit sharing and commissions	1,491	(1,246)	2,064
Long-term liabilities	(2,276)	(718)	242
Accrued workers’ compensation	(173)	(343)	(1,024)
Income taxes payable	2,595	(5,599)	1,046
Net cash provided by operating activities	160,080	119,065	98,965
Cash flows from investing activities
Capital expenditures	(29,310)	(58,041)	(42,002)
Assets acquisitions, net of cash acquired	(2,007)	(27,921)	(5,361)
Equity investments	0	0	(2,500)
Proceeds from sale of property and equipment	21,068	681	1,320
Proceeds from sale of a business	0	9,466	0
Net cash used in investing activities	(10,249)	(75,815)	(48,543)
Cash flows from financing activities
Repayment of long-term borrowings and capital leases	(968)	(354)	0
Repayment of debt and line of credit borrowings	821	(400)	0
Deferred and contingent consideration paid for asset acquisitions	(364)	(205)	(27)
Debt issuance costs	0	0	(1,125)
Repurchase of common stock	(110,540)	(70,000)	(53,502)
Issuance of Company’s common stock	695	6,610	7,976
Excess tax benefit of options exercised and restricted stock units vested	0	0	273
Dividends paid	(39,891)	(36,981)	(32,711)
Cash paid on behalf of employees for shares withheld	(5,146)	(5,341)	(4,018)
Net cash used in financing activities	(155,393)	(106,671)	(83,134)
Effect of exchange rate changes on cash	(2,772)	5,398	424
Net decrease in cash and cash equivalents	(8,334)	(58,023)	(32,288)
Cash and cash equivalents at beginning of year	168,514	226,537	258,825
Cash and cash equivalents at end of year	160,180	168,514	226,537
Cash paid during the year for
Interest	160	121	284
Income taxes	40,123	50,832	49,425
Noncash activity during the year for
Noncash capital expenditures	908	1,533	2,318
Capital lease obligations	0	3,750	0
Contingent consideration for acquisition	0	1,314	0
Issuance of Company's common stock for compensation	465	411	315
Dividends declared but not paid	$ 9,988	$ 9,954	$ 8,535

Operations and Summary of Signi

Operations and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operations and Summary of Significant Accounting Policies	Operations and Summary of Significant Accounting Policies Nature of Operations Simpson Manufacturing Co., Inc., through Simpson Strong-Tie Company Inc. and its other subsidiaries (collectively, the “Company”), focuses on designing, manufacturing, and marketing systems and products to make buildings and structures safe and secure. The Company designs, engineers and is a leading manufacturer of wood construction products, including connectors, truss plates, fastening systems, fasteners and shearwalls, and concrete construction products, including adhesives, specialty chemicals, mechanical anchors, powder actuated tools and fiber reinforcing materials. The Company markets its products to the residential construction, industrial, commercial and infrastructure construction, remodeling and do-it-yourself markets. The Company operates exclusively in the building products industry. The Company’s products are sold primarily in the United States, Canada, Europe and Pacific Rim. A portion of the Company’s business is therefore dependent on economic activity within the North America segment. The Company is dependent on the availability of steel, its primary raw material. Principles of Consolidation The accompanying consolidated financial statements include the accounts of Simpson Manufacturing Co., Inc. and its subsidiaries. Investments in 50% or less owned entities are accounted for using either cost or the equity method. The Company consolidates all variable interest entities ("VIEs") where it is the primary beneficiary. There were no VIEs as of December 31, 2018 or 2017 . All significant intercompany transactions have been eliminated. Use of Estimates The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America, as amended from time to time ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. The Company's actual results could differ from those estimates. Cash Equivalents Cash and cash equivalents include cash on hand, cash in banks and cash equivalents, which are highly liquid investments with an original or remaining maturity of three months or less at the time of purchase to be cash equivalents. Allowance for Doubtful Accounts The Company evaluates the collectability of specific customer accounts that would be considered doubtful based on the customer’s financial condition, payment history, credit rating and other factors that the Company considers relevant, or accounts that the Company assigns for collection. The Company reserves for the portion of those outstanding balances that the Company believes it is not likely to collect based on historical collection experience. The Company also reserves 100% of the amounts that it deems uncollectable due to a customer’s deteriorating financial condition or bankruptcy. If the financial condition of the Company’s customers were to deteriorate, resulting in probable inability to make payments, additional allowances may be required. Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash in banks, short-term investments in money market funds and trade accounts receivable. The Company maintains its cash in demand deposit and money market accounts held primarily at 17 banks. Inventory Valuation Inventories are stated at the lower of cost or net realizable value. Cost includes all costs incurred in bringing each product to its present location and condition, as follows: • Raw materials and purchased finished goods for resale — principally valued at cost determined on a weighted average basis; and • In-process products and finished goods — cost of direct materials and labor plus attributable overhead based on a normal level of activity. The Company applies net realizable value and obsolescence to the gross value of the inventory. The Company estimates net realizable value based on estimated selling price less further costs to completion and disposal. The Company impairs slow-moving products by comparing inventories on hand to projected demand. If on-hand supply of a product exceeds projected demand or if the Company believes the product is no longer marketable, the product is considered obsolete inventory. The Company revalues obsolete inventory to its net realizable value and has consistently applied this methodology. When impairments are established, a new cost basis of the inventory is created. Unexpected change in market demand, building codes or buyer preferences could reduce the rate of inventory turnover and require the Company to recognize more obsolete inventory. Warranties and recalls The Company provides product warranties for specific product lines and records estimated recall expenses in the period in which the recall occurs, none of which has been material to the Consolidated Financial Statements. In a limited number of circumstances, the Company may also agree to indemnify customers against legal claims made against those customers by the end users of the Company’s products. Historically, payments made by the Company, if any, under such agreements have not had a material effect on the Company’s consolidated results of operations, cash flows or financial position. Fair Value of Financial Instruments Fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that is determined based on assumptions that market participants would use in pricing an asset or a liability. Assets and liabilities recorded at fair value are measured and classified under a three-tier fair valuation hierarchy based on the observability of the inputs available in the market: Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities; Level 2 inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument; and Level 3 inputs are unobservable inputs based on the Company’s assumptions used to measure assets and liabilities at fair value. The fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. As of December 31, 2018 and 2017 , the Company’s investments included in cash equivalents consisted of only money market funds, which are the Company’s primary financial instruments and carried at cost, approximating fair value, based on Level 1 inputs. The balance of the Company’s primary financial instruments as of December 31, 2018 and 2017 was $0.2 million and $5.3 million , respectively. The carrying amounts of trade accounts receivable, accounts payable and accrued liabilities approximate fair value due to the short-term nature of these instruments. The fair value of the Company’s contingent consideration related to acquisitions is classified as Level 3 within the fair value hierarchy as it is based on unobserved inputs such as management estimates and entity-specific assumptions and is evaluated on an ongoing basis. Property, Plant and Equipment Property, plant and equipment are carried at cost. Major renewals and betterments are capitalized. Maintenance and repairs are expensed as incurred. When assets are sold or retired, their costs and accumulated depreciation are removed from the accounts, and the resulting gains or losses are reflected in the accompanying Consolidated Statements of Operations. The “Intangibles—Goodwill and Other” topic of the FASB ASC provides guidance on capitalization of the costs incurred for computer software developed or obtained for internal use. The Company capitalizes qualified external costs and internal costs related to the purchase and implementation of software projects used for business operations and engineering design activities. Capitalized software costs primarily include purchased software, internal costs and external consulting fees. Capitalized software projects are amortized over the estimated useful lives of the software. Depreciation and Amortization Software, including amounts capitalized for internally developed software is amortized on a straight-line basis over an estimated useful life of three to five years. Machinery and equipment is depreciated using accelerated methods over an estimated useful life of three to ten years. Buildings and site improvements are depreciated using the straight-line method over their estimated useful lives, which range from 15 to 45 years. Leasehold improvements are amortized using the straight-line method over the shorter of the expected life or the remaining term of the lease. Purchased intangible assets with finite useful lives are amortized using the straight-line method over the estimated useful lives of the assets. Preferred Stock The Board has the authority to issue the authorized and unissued preferred stock in one or more series with such designations, rights and preferences as may be determined from time to time by the Board. Accordingly, the Board is empowered, without stockholder approval, to issue preferred stock with dividend, redemption, liquidation, conversion, voting or other rights that could adversely affect the voting power or other rights of the holders of the Company’s common stock. Common Stock Subject to the rights of holders of any preferred stock that may be issued in the future, holders of common stock are entitled to receive such dividends, if any, as may be declared from time to time by the Company’s Board of Directors (the "Board") out of legally available funds, and in the event of liquidation, dissolution or winding-up of the Company, to share ratably in all assets available for distribution. The holders of common stock have no preemptive or conversion rights. Subject to the rights of any preferred stock that may be issued in the future, the holders of common stock are entitled to one vote per share on any matter submitted to a vote of the stockholders. A director in an uncontested election is elected if the votes cast “for” such director’s election exceed the votes cast “against” such director’s election, except that, if a stockholder properly nominates a candidate for election to the Board, the candidates with the highest number of affirmative votes (up to the number of directors to be elected) are elected. There are no redemption or sinking fund provisions applicable to the common stock. Comprehensive Income or Loss Comprehensive income is defined as net income plus other comprehensive income or loss. Other comprehensive income or loss consists of changes in cumulative translation adjustments and changes in unamortized pension adjustments recorded directly in accumulated other comprehensive income within stockholders’ equity. Foreign Currency Translation The local currency is the functional currency of most of the Company’s operations in Europe, Canada, Asia, Australia and New Zealand. Assets and liabilities denominated in foreign currencies are translated using the exchange rate on the balance sheet date. Revenues and expenses are translated using average exchange rates prevailing during the year. The translation adjustment resulting from this process is shown separately as a component of stockholders’ equity. Foreign currency transaction gains or losses are included in general and administrative expenses. Revenue Recognition Generally, the Company's revenue contract with a customer exists when the goods are shipped, and services are rendered; and its related invoice is generated. The duration of the contract does not extend beyond the promised goods or services already transferred. The transaction price of each distinct promised product or service specified in the invoice is based on its relative stated standalone selling price. The Company recognizes revenue when it satisfies a performance obligation by transferring control over a product to a customer at a point in time. The Company’s shipping terms provide the primary indicator of the transfer of control. The Company's general shipping terms are F.O.B. shipping point, where title and risk and rewards of ownership transfer at the point when the products leave the Company's warehouse. The Company recognizes revenue based on the consideration specified in the invoice with a customer, excluding any sales incentives, discounts, and amounts collected on behalf of third parties (i.e., governmental tax authorities). Based on historical experience with the customer, the customer's purchasing pattern and its significant experience selling products, the Company concluded that a significant reversal in the cumulative amount of revenue recognized will not occur when the uncertainty (if any) is resolved (that is, when the total amount of purchases is known). Refer to Note 2 for additional information. Sales Taxes The Company presents taxes collected and remitted to governmental authorities on a net basis in the accompanying Consolidated Statements of Operations. Cost of Sales The types of costs included in cost of sales include material, labor, factory and tooling overhead, shipping, and freight costs. Major components of these expenses are material costs, such as steel, packaging and cartons, personnel costs, and facility costs, such as rent, depreciation and utilities, related to the production and distribution of the Company’s products. Inbound freight charges, purchasing and receiving costs, inspection costs, warehousing costs, internal transfer costs, and other costs of the Company’s distribution network are also included in cost of sales. Tool and Die Costs Tool and die costs are included in product costs in the year incurred. Shipping and Handling Fees and Costs The Company’s general shipping terms are F.O.B. shipping point. Shipping and handling fees and costs are included in revenues and product costs, as appropriate, in the year incurred. Product and Software Research and Development Costs Product research and development costs, which are included in operating expenses and are charged against income as incurred, were $10.8 million , $10.6 million and $10.8 million in 2018 , 2017 and 2016 , respectively. The types of costs included as product research and development expenses was revised in 2017 and prior years to include all related personnel costs including salary, benefits, retirement, stock-based compensation costs, as well as computer and software costs, professional fees, supplies, tools and maintenance costs. In 2018 , 2017 and 2016 , the Company incurred software development expenses related to its expansion into the plated truss market and some of the software development costs were capitalized. See "Note 8 — Property, Plant and Equipment." The Company amortizes acquired patents over their remaining lives and performs periodic reviews for impairment. The cost of internally developed patents is expensed as incurred. Selling Costs Selling costs include expenses associated with selling, merchandising and marketing the Company’s products. Major components of these expenses are personnel, sales commissions, facility costs such as rent, depreciation and utilities, professional services, information technology costs, sales promotion, advertising, literature and trade shows. Advertising Costs Advertising costs are included in selling expenses are expensed when the advertising occurs and were $7.6 million , $9.6 million and $7.1 million in 2018 , 2017 , and 2016 , respectively. General and Administrative Costs General and administrative costs include personnel, information technology related costs, facility costs such as rent, depreciation and utilities, professional services, amortization of intangibles and bad debt charges. Accounting for Stock-Based Compensation The Company recognizes stock-based expense related to stock options and restricted stock awards on a straight-line basis, net of forfeitures, over the requisite service period of the awards, which is generally the vesting term of four years. Stock-based expense related to performance share grants are measured based on grant date fair value and expensed on a graded basis over the service period of the awards, which is generally a performance period of three years. The assumptions used to calculate the fair value of options or restricted stock units are evaluated and revised, as necessary, to reflect market conditions and the Company’s experience. Income Taxes Income taxes are calculated using an asset and liability approach. The provision for income taxes includes federal, state and foreign taxes currently payable and deferred taxes, due to temporary differences between the financial statement and tax bases of assets and liabilities. In addition, future tax benefits are recognized to the extent that realization of such benefits is more likely than not. This method gives consideration to the future tax consequences of the deferred income tax items and immediately recognizes changes in income tax laws in the year of enactment. On December 22, 2017, the President of the United States signed into law the Tax Cuts and Jobs Act of 2017 (the “Tax Reform Act”). Further information on the tax impacts of the Tax Reform Act is included in Note 10 — Income Taxes of the Company’s consolidated financial statements. Net Income per Share Basic net income per common share is computed based on the weighted average number of common shares outstanding. Potentially dilutive shares, using the treasury stock method, are included in the diluted per-share calculations for all periods when the effect of their inclusion is dilutive. Recently Adopted Accounting Standards In May 2014, the FASB issued Accounting Standards Update No. 2014-09 (later codified as ASC 606), Revenue from Contracts with Customers (“ASC 606”), which supersedes nearly all existing revenue recognition guidance under GAAP. ASC 606 provides a five-step model for revenue recognition to be applied to all revenue contracts with customers. The five-step model includes: (1) determination of whether a contract, an agreement between two or more parties that creates legally enforceable rights and obligations, exists; (2) identification of the performance obligations in the contract; (3) determination of the transaction price; (4) allocation of the transaction price to the performance obligations in the contract; and (5) recognition of revenue when (or as) the performance obligations are satisfied. The core principle of ASC 606 is that an entity should recognize revenue for the transfer of goods or services equal to the amount that it expects to be entitled to receive for those goods or services. ASC 606 also requires additional disclosures about the nature, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments. The standard is effective for annual and interim periods beginning after December 15, 2017 and permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (modified retrospective method). The Company adopted the new revenue standard on January 1, 2018 using the modified retrospective approach. Refer to Note 2 for additional information. In October 2016, the FASB issued Accounting Standards Update ("ASU") No. 2016-16, Income Taxes (Topic 740), Intra-Entity Transfers of Assets Other Than Inventory ("ASU 2016-16"), which requires companies to account for the income tax effects of intercompany sales and transfers of assets other than inventory when the transfer occurs. Current guidance requires companies to defer the income tax effects of intercompany transfers of assets until the asset has been sold to an outside party or otherwise recognized. On January 1, 2018, the Company adopted ASU 2016-16 using a modified retrospective approach. Adoption of ASU 2016-16 had no material effect on the Company's consolidated financial statements and footnote disclosures. In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment ("ASU 2017-04"), which eliminates the requirement to calculate the implied fair value of goodwill to measure a goodwill impairment charge or Step 2 of the goodwill impairment analysis. Instead, an impairment charge will be recorded based on the excess of a reporting unit's carrying amount over its fair value using Step 1 of the goodwill impairment analysis. On January 1, 2018, the Company prospectively adopted ASU 2017-04. In 2018, the Company applied ASU 2017-04 to the Company's measurement of impairment for its Denmark reporting unit. Refer to Note 9 for additional information. In February 2018, the FASB issued ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income ("ASU 2018-02") . ASU 2018-02 allows but not require a reclassification from Accumulated other Comprehensive Income to Retained Earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017. The amendments in this ASU are effective for fiscal years beginning after December 15, 2018 and for interim periods therein. During the fourth quarter of 2018, the Company early adopted the new accounting guidance and elected to reclass the stranded tax effects under ASU 2018-02. The election resulted in a reclass of $0.4 million to retained earnings. All other issued and effective accounting standards during 2018 were determined to be not relevant or material to the Company. Recently Issued Accounting Standards Not Yet Adopted In February 2016, the FASB issued ASU No. 2016-02, (Topic 842), Leases (“ASU 2016-02”). ASU 2016-02 core requirement is to recognize the assets and liabilities that arise from leases including those leases classified as operating leases. The amendments require a lessee to recognize a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term in the statement of financial position. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset to not recognize lease assets and lease liabilities. If a lessee makes this election, it should recognize lease expense for such leases generally on a straight-line basis over the lease term. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with early adoption permitted. Optional transition method - ASC 2018-11, Topic 842, Targeted Improvements (issued in July 2018) provide entities with an additional (and optional) transition method to adopt the new lease standard. This additional transition method allows a cumulative effect adjustment to the opening balance of retained earnings in the period of adoption without adjusting the comparative periods presented. On January 1, 2019, the Company will adopt the new lease standard using the optional transition method. During the fourth quarter of 2018, in preparation for the adoption of the new lease accounting standard, the Company has implemented internal controls and a new lease accounting information system to enable the preparation of financial information. The Company will elect and apply practical transition expedients of not reassessing whether any expired or existing contracts are or contain leases; not reassessing the lease classification for any expired or existing leases and not reassessing initial direct costs for any existing leases. The adoption of Topic 842 will result in recognition of right-of-use ("ROU") assets and lease liabilities of approximately $36.0 million to $37.0 million and approximately $35.0 million to $36.0 million

Revenue from Contract with Cust

Revenue from Contract with Customer	12 Months Ended
	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer	Revenue from Contracts with Customers On January 1, 2018, the Company adopted the New Revenue Standard ("Topic 606") using the modified retrospective method and recorded an $0.8 million , net of tax, increase to opening retained earnings on January 1, 2018 as the cumulative effect of adopting Topic 606 for estimated rights of return assets on product sales. Disaggregated revenue Under Topic 606, the Company disaggregates net sales consistent with the distribution of the Company's net sales by the following product groups as noted in Note 18 segment information of these financial statements. • Wood Construction Products Revenue . Wood construction products represented almost 85% of total net sales in the year ended December 31, 2018 . • Concrete Construction Products Revenue. Concrete construction products represented 15% of total net sales in the year ended December 31, 2018 . Customer acceptance criteria. Generally, there are no customer acceptance criteria included in the Company's standard sales agreement with customers. When an arrangement with the customer does not meet the criteria to be accounted for as a revenue contract under the standard, the Company recognizes revenue in the amount of nonrefundable consideration received when the Company has transferred control of the goods or services and has stopped transferring (and has no obligation to transfer) additional goods or services. The Company offers certain customers discounts for paying invoices ahead of the due date, which are generally 30 to 60 days. Other revenue . Service sales, representing after-market repair and maintenance, engineering activities and software license sales and services are less than 1.0% of net sales and recognized as the services are completed or the software products and services are delivered. Services may be sold separately or in bundled packages. The typical contract length for service is generally less than one year. For bundled packages, the Company accounts for individual services separately if they are distinct. A distinct service is separately identifiable from other items in the bundled package if a customer can benefit from it on its own or with other resources that are readily available to the customer. The consideration (including any discounts) is allocated between separate services in a bundle based on their stand-alone selling prices. The stand-alone selling prices are determined based on the prices at which the Company separately sells the services. Reconciliation of contract balances Contract assets are the rights to consideration in exchange for goods or services that the Company has transferred to a customer when that right is conditional on something other than the passage of time. Contract liabilities are recorded for any services billed to customers and not yet recognizable if the contract period has commenced or for the amount collected from customers in advance of the contract period commencing. As of December 31, 2018 , the Company had no contract assets or contract liabilities from contracts with customers . Other accounting issues Volume discounts. Volume discounts are accounted for as variable consideration because the transaction price is uncertain until the customer completes or fails to purchase the specified volume of purchases (consideration is contingent on a future outcome - occurrence or nonoccurrence). In addition, the Company applies the volume rebate or discount retrospectively, because the final price of each products or services sold depends on the customer's total purchases subject to the rebate program. The estimated rebates are deducted from the transaction price revenues based on the historical experience with the customer. Rights of return and other allowances. Rights of return creates variability in the transaction price. The Company accounts for returned product during the return period as a refund to customer and not a performance obligation. The estimated allowance for returns is based on historical percentage of returns and allowance from prior periods and the customer's historical purchasing pattern. This estimate is deducted from revenues based on the gross transaction price. Principal versus Agent. The Company considered the principal versus agent guidance of the new revenue recognition standard and concluded that the Company is the principal in a third-party transaction. The Company manufactures its products and has control over transfer of its products to Dealer Distributors, Contract Distributors, and end customers. Costs to obtain or fulfill a contract. Costs incurred to obtain a contract are immaterial. Commission cost is not an incremental cost directly related to obtaining a contract. Shipping costs. The Company recognizes shipping and handling activities that occur after the customer has obtained control of goods as a fulfillment cost rather than as an additional promised service. Therefore, the Company recognizes revenue and accrues shipping and handling costs when the control of goods transfers to the customer upon shipment. Advertising costs. Cooperative advertising and partnership discounts are consideration payable to a customer and not a payment in exchange for a distinct product or service at fair value. Estimated cooperative advertising and partnership discounts are reductions to the transaction price. Practical Expedients.

Net Income per Share

Net Income per Share	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Net Income per Share	Net Income per Share The following shows a reconciliation of basic earnings per share (“EPS”) to diluted EPS: For the Year Ended December 31, (in thousands, except per-share amounts) 2018 2017 2016 Net income available to common stockholders $ 126,633 $ 92,617 $ 89,734 Basic weighted average shares outstanding 46,213 47,486 48,084 Dilutive effect of potential common stock equivalents 327 288 211 Diluted weighted average shares outstanding 46,540 47,774 48,295 Net earnings per share: Basic $ 2.74 $ 1.95 $ 1.87 Diluted $ 2.72 $ 1.94 $ 1.86

Shareholders' equity

Shareholders' equity	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Stock Repurchase Program At its meeting in August 2016, the Board authorized the Company to repurchase up to $125 million of its common stock. This authorization increased and extended the $50.0 million repurchase authorization from February 2016. At its meeting in August 2017, the Board authorized the Company to repurchase up to $275.0 million of its common stock. This authorization increased and extended the $125.0 million repurchase authorization from August 2016 and remained in effect through December 31, 2018. For the fiscal year ended December 31, 2017, the Company purchased a total of 1,138,387 shares of its common stock for a total of $60.0 million through accelerated share repurchase programs that the Company entered into with Wells Fargo, which included 460,887 shares purchased at an average share price of $43.39 per share pursuant to a $20.0 million accelerated share repurchase program initiated in June 2017 (the "2017 June ASR Program"), and 677,500 shares received at an average share price of $59.04 per share, or $40.0 million , pursuant to a $50.0 million accelerated share repurchase program initiated in December 2017 (the "2017 December ASR Program"). In February 2018, the Company received 182,171 shares of its common stock as the final delivery for the 2017 December ASR Program. For the year ended December 31, 2018, the Company repurchased 1,772,658 shares of the Company's common stock on the open market at an average price of $62.69 per share. As of December 31, 2018, the Company repurchased approximately $234.6 million of the Company's previously announced $275.0 million share repurchase authorization (which expired at the end of 2018). At the Company's meeting in December 2018, the Board authorized the Company to repurchase up to $100.0 million of its common stock which will remain in effect through the end of 2019. See the "Consolidated Statements of Stockholders’ Equity for the years ended December 31, 2018 , 2017 and 2016 ." Comprehensive Income or Loss The following shows the components of accumulated other comprehensive income or loss as of December 31, 2018 and 2017 , respectively: Foreign Currency Translation Pension Benefit Total (in thousands) Balance at January 1, 2016 $ (27,552 ) $ (1,024 ) $ (28,576 ) Other comprehensive income before reclassification net of tax benefit (expense) of ($222) and $87, respectively (3,920 ) (474 ) (4,394 ) Balance at December 31, 2016 (31,472 ) (1,498 ) (32,970 ) Other comprehensive loss net of tax benefit (expense) of ($0) and $37, respectively 21,273 (944 ) 20,329 Amounts reclassified from accumulative other comprehensive income, net of $0 tax 145 — 145 Balance at December 31, 2017 (10,054 ) (2,442 ) (12,496 ) Other comprehensive loss net of tax benefit (expense) of $0 and $59, respectively (12,911 ) 757 (12,154 ) Balance at December 31, 2018 $ (22,965 ) $ (1,685 ) $ (24,650 )

Stock-Based Compensation Plans

Stock-Based Compensation Plans	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation Plans	Stock-Based Compensation The Company currently maintains an equity incentive plan, the Simpson Manufacturing Co., Inc. Amended and Restated 2011 Incentive Plan (the “2011 Plan”). The 2011 Plan amended and restated in their entirety, and incorporated and superseded, both the Simpson Manufacturing Co., Inc. 1994 Stock Option Plan (the “1994 Plan”), which was principally for the Company’s employees, and the Simpson Manufacturing Co., Inc. 1995 Independent Director Stock Option Plan (the “1995 Plan”), which was for the Company's independent directors. Awards previously granted under the 1994 Plan or the 1995 Plan will not be affected by the adoption of the 2011 Plan and will continue to be governed by the 1994 Plan or the 1995 Plan, respectively. The Company does not currently intend to award incentive stock options or restricted stock units under the 1994 Plan or the 1995 Plan. Under the 2011 Plan, no more than 16.3 million shares of the Company’s common stock in aggregate may be issued including shares already issued pursuant to prior awards granted under the 2011 Plan. Shares of common stock underlying awards to be issued pursuant to the 2011 Plan are registered under the Securities Act. Under the 2011 Plan, the Company may grant restricted stock and restricted stock units, although the Company currently intends to award primarily performance-based and/or time-based restricted stock units ("RSUs"). The following table shows the Company’s stock-based compensation activity: Fiscal Years Ended December 31, (in thousands) 2018 2017 2016 Stock-based compensation expense recognized in operating expenses $ 10,356 $ 12,744 $ 13,113 Tax benefit of stock-based compensation expense in provision for income taxes 2,476 4,575 4,757 Stock-based compensation expense, net of tax $ 7,880 $ 8,169 $ 8,356 Fair value of shares vested $ 15,372 $ 11,043 $ 13,186 Proceeds to the Company from the exercise of stock-based compensation $ 695 $ 6,610 $ 7,976 Tax benefit from exercise of stock-based compensation, including shortfall tax benefits $ — $ — $ (251 ) The Company allocates stock-based compensation expense among cost of sales, research and development and other engineering expense, selling expense, or general and administrative expense based on the job functions performed by the employees to whom the stock-based compensation is awarded. Stock-based compensation cost capitalized in inventory was immaterial for all periods presented. The following table summarizes the Company’s unvested restricted stock unit activity for the year ended December 31, 2018 : Shares Weighted- Aggregate Unvested Restricted Stock Units (RSUs) Outstanding at January 1, 2018 696 $ 35.34 $ 39,609 Awarded 189 54.99 Vested (263 ) 35.23 Forfeited (18 ) 39.23 Outstanding at December 31, 2018 604 $ 41.37 $ 32,669 Outstanding and expected to vest at December 31, 2018 598 $ 41.32 $ 32,388 * The intrinsic value for outstanding and expected to vest is calculated using the closing price per share of $54.13 , as reported by the New York Stock Exchange on December 31, 2018 . During the year ended December 31, 2018 , the Company granted 189,167 RSUs to the Company's employees, including officers, and eight non-employee directors at an estimated weighted average fair value of $54.99 per share, based on the closing price (adjusted for certain market factors, and to a lesser extent, the present value of dividends) of the Company's common stock on the grant grants. The RSUs granted to the Company's employees may be time-based, performance-based or time- and performance-based. Certain of the performance-based RSUs are granted to officers and key employees, where the number of performance-based awards to be issued is based on the achievement of certain Company performance criteria established in the RSU agreement over a cumulative three year period. These awards cliff vest after three years. In addition, these same officers and key employees also receive time-based RSUs, which vest pursuant to a three-year graded vesting schedule. Time- and performance based RSUs are granted to the Company's employees excluding officers and certain key employees, vest ratably over the four year life of the award, and require the underlying shares of the Company's common stock to be subject to a performance-based adjustment during the first year. The total intrinsic value of RSUs vested during the years ended December 31, 2018 , 2017 and 2016 was $9.8 million , $10.8 million and $10.3 million , respectively, based on the market value on the vest date. The following table summarizes the Company’s stock option activity for the year ended December 31, 2018: Shares Weighted- Weighted- Aggregate Non-Qualified Stock Options Outstanding at January 1, 2018 28 $ 29.66 0.1 $ 780 Exercised (23 ) $ 29.66 Forfeited (5 ) $ 29.66 Outstanding and exercisable at December 31, 2018 — $ — — $ — The total intrinsic value of stock options exercised during each of the three years ended December 31, 2018, 2017 and 2016, was $0.7 million , $4.6 million and $ 3.1 million , respectively. Currently, the Company is not awarding stock options under its 2011 Plan. As of December 31, 2018 , the Company's aggregate unamortized stock compensation expense was approximately $10.3 million, which is entirely attributable to unvested RSUs and is expected to be recognized in expense over a weighted-average period of approximately 2.1 years. Stock Bonus Plan The Company also maintains a stock bonus plan, the Simpson Manufacturing Co., Inc. 1994 Employee Stock Bonus Plan (the “Stock Bonus Plan”), whereby it awards shares of the Company’s common stock to employees, who do not otherwise participate in any of the Company’s equity-based incentive plans and meet minimum service requirements as determined by the Committee. The number of shares awarded, as well as the required period of service, is determined by the Committee. Shares have generally been awarded under the Stock Bonus Plan following the year in which the respective employee reached his or her tenth, twentieth, thirtieth, fortieth or fiftieth anniversary of employment with the Company or any direct or indirect subsidiary thereof. The Company awarded 9,000 shares for service through 2018, ( 5,500 shares to be issued and 3,500 shares of which are expected to be settled in cash for the Company's foreign employees). In 2017 and 2016 , the Company awarded 12,000 and 10,000 shares, respectively. As a result, we recorded pre-tax compensation charges of $0.8 million , $1.2 million and $0.8 million for each of the years ended December 31, 2018 , 2017 and 2016

Trade Accounts Receivable, net

Trade Accounts Receivable, net	12 Months Ended
	Dec. 31, 2018
Receivables [Abstract]
Trade Accounts Receivable, net	Trade Accounts Receivable, net Trade accounts receivable consisted of the following: December 31, (in thousands) 2018 2017 Trade accounts receivable $ 149,886 $ 139,910 Allowance for doubtful accounts (1,364 ) (996 ) Allowance for sales discounts (2,470 ) (2,956 ) $ 146,052 $ 135,958 The Company adopted ASC 606 effective January 1, 2018, resulting in the reclassification of an estimated refund liability of $ 0.8 million from allowance for sales discounts and returns to other current liabilities as of December 31, 2018

Inventories

Inventories	12 Months Ended
	Dec. 31, 2018
Inventory Disclosure [Abstract]
Inventories	Inventories The components of inventories consisted of the following: December 31, (in thousands) 2018 2017 Raw materials $ 98,058 $ 91,022 In-process products 24,645 26,849 Finished products 153,385 135,125 $ 276,088 $ 252,996

Property, Plant and Equipment P

Property, Plant and Equipment Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment, net Property, plant and equipment consisted of the following: December 31, (in thousands) 2018 2017 Land $ 30,034 $ 33,087 Buildings and site improvements 198,809 212,817 Leasehold improvements 4,826 4,684 Machinery and equipment 330,076 300,334 563,745 550,922 Less accumulated depreciation and amortization (318,388 ) (299,907 ) 245,357 251,015 Capital projects in progress 9,240 22,005 $ 254,597 $ 273,020 Included in property, plant and equipment at December 31, 2018 and 2017 , are fully depreciated assets with an original cost of $196.8 million and $189.9 million , respectively. These fully depreciated assets are still in use in the Company’s operations. The Company capitalizes certain development costs associated with internal use software, including the direct costs of services provided by third-party consultants and payroll for internal employees, both of which are performing development and implementation activities on a software project. As of December 31, 2018 and 2017 , the Company had capitalized software development costs subject to amortization of $39.1 million and $20.5 million , respectively, and as of December 31, 2018 and 2017, $3.6 million and $12.2 million , respectively, included in capital projects in progress. In November 2018, the Company sold a facility that was not occupied by the Company and was leased to a third party. The Company received net proceeds of $17.5 million , after closing costs and sales price adjustments Depreciation expense, including depreciation of equipment, internally developed software and software acquired through capital lease arrangements, was $33.3 million , $27.3 million and $21.6 million for the years ended December 31, 2018 , 2017 and 2016

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, Net	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets, Net	Goodwill and Intangible Assets Goodwill The annual changes in the carrying amount of goodwill, by segment, as of December 31, 2017 and 2018 , were as follows, respectively: (in thousands) North Europe Asia Total Balance as of January 1, 2017 Goodwill $ 96,154 $ 51,031 $ 1,375 $ 148,560 Accumulated impairment losses (10,666 ) (13,415 ) — (24,081 ) 85,488 37,616 1,375 124,479 Goodwill acquired 10,066 — — 10,066 Foreign exchange 198 2,472 114 2,784 Reclassifications (1) 3 (192 ) — (189 ) Balance as of December 31, 2017 0 Goodwill 106,421 53,311 1,489 161,221 Accumulated impairment losses (10,666 ) (13,415 ) — (24,081 ) 95,755 39,896 1,489 137,140 Goodwill acquired 913 — — 913 Foreign exchange (233 ) (738 ) (145 ) (1,116 ) Balance as of December 31, 2018 0 Goodwill 107,101 52,573 1,344 161,018 Accumulated impairment losses (10,666 ) (20,102 ) — (30,768 ) $ 96,435 $ 32,471 $ 1,344 $ 130,250 (1) During 2017, $3 thousand and $192 thousand was reclassified to other assets, with a corresponding $189 thousand decrease in goodwill related to the CG Visions and MS Decoupe acquisitions. Goodwill Impairment Testing The Company tests goodwill for impairment at the reporting unit level on an annual basis (in the fourth quarter for the Company). The Company also reviews goodwill for impairment whenever events or changes in circumstances indicate the carrying value of an asset may not be recoverable. These events or circumstances could include a significant change in the business climate, legal factors, operating performance indicators, competition, or disposition or relocation of a significant portion of a reporting unit. The reporting unit level is generally one level below the operating segment, which is at the country level, except for the United States, Australia and S&P Clever reporting units. The Company determined that the United States reporting unit includes four components: Northwest United States, Southwest United States, Northeast United States and Southeast United States (collectively, the “U.S. Components”). The Company aggregates the U.S. Components into a single reporting unit because management concluded that they are economically similar and that the goodwill is recoverable from the U.S. Components working in concert. The U.S. Components are economically similar because of a number of factors, including selling similar products to shared customers and sharing assets and services such as intellectual property, manufacturing assets for certain products, research and development projects, manufacturing processes, management of inventory excesses and shortages and administrative services. These activities are managed centrally at the U.S. Components level and costs are allocated among the four U.S. Components. The Company determined that the Australia reporting unit includes three components: Australia, New Zealand, and United Arab Emirates (collectively, the “AU Components”). The Company aggregates the AU Components into a single reporting unit because management concluded that they are economically similar and that the goodwill is recoverable from the AU Components working in concert. The AU Components are economically similar because of a number of factors, including that New Zealand, and United Arab Emirates operate as extensions of their Australian parent company selling similar products and sharing assets and services such as intellectual property, manufacturing assets for certain products, management of inventory excesses and shortages and administrative services. These activities are managed centrally at the AU Components level and costs are allocated among the AU Components. The Company determined that the S&P Clever reporting unit includes ten components: S&P Switzerland, S&P Poland, S&P Austria, S&P The Netherlands, S&P Portugal, S&P Germany, S&P France, Socom, S&P Nordic and S&P Spain (collectively, the "S&P Components”). The Company aggregates the S&P Components into a single reporting unit because management concluded that they are economically similar and that the goodwill is recoverable from the S&P Components working in concert. The S&P Components are economically similar because of a number of factors, including sharing assets and services such as intellectual property, manufacturing assets for certain products, research and development projects, manufacturing processes, management of inventory excesses and shortages and administrative services. These activities are managed centrally at the S&P Components level and costs are allocated among the S&P Components. The Company may first assess qualitative factors related to the goodwill of the reporting unit to determine whether it is necessary to perform an impairment test. If the Company judges that it is more likely than not that the fair value of the reporting unit is greater than the carrying amount of the reporting unit, including goodwill, no further testing is required. This assessment method was not utilized in our 2018 annual goodwill impairment test. For all reporting units, the Company compares the fair value of the reporting unit to its carrying value. The fair value calculation uses both the income approach (discounted cash flow method) and the market approach, equally weighted. If the Company judges that the carrying value of the net assets assigned to the reporting unit, including goodwill, exceeds the fair value of the reporting unit, the Company would record an impairment charge equal to the difference between the implied fair value of the goodwill and the carrying value, not to exceed the goodwill asset's carrying amount. Determining the fair value of a reporting unit, or an indefinite-lived purchased intangible asset, requires significant estimates and assumptions. These estimates and assumptions include revenue growth rates, operating margins and working capital requirements used to calculate projected future cash flows, risk-adjusted discount rates, selected multiples, control premiums and future economic and market conditions (Level 3 fair value inputs). The Company bases its fair value estimates on assumptions that it believes to be reasonable, but that are unpredictable and inherently uncertain. Actual future results may differ from those estimates. Assumptions about a reporting unit’s operating performance in the first year of the discounted cash flow model used to determine whether or not the goodwill related to that reporting unit is impaired are derived from the Company’s budget. The fair value model considers such factors as macro-economic conditions, revenue and expense forecasts, product line changes, material, labor and overhead costs, tax rates, working capital levels and competitive environment. Future estimates, however derived, are inherently uncertain but the Company believes that this is the most appropriate source on which to base its fair value calculations. The Company uses these parameters only to provide a basis for the determination of whether or not the goodwill related to a reporting unit is impaired. No inference whatsoever should be drawn from these parameters about the Company’s future financial performance and they should not be taken as projections or guidance of any kind. The 2018 annual testing of goodwill for impairment resulted in an impairment charge. The carrying value of the Denmark reporting unit exceeded its fair value in an amount that approximated the carrying value of its goodwill, primarily due to the reporting unit not meeting management's pre-tax operating profit objectives. As a result, the Company impaired all of the Denmark reporting unit’s goodwill, which was $6.7 million at December 31, 2018 . The 2017 and 2016 annual testing of goodwill for impairment did not result in impairment charges. Amortizable Intangible Assets Intangible assets from acquired businesses are recognized at their estimated fair values at the date of acquisition and consist of patents, unpatented technology, non-compete agreements, trademarks, customer relationships and other intangible assets. Finite-lived intangibles are amortized to expense over the applicable useful lives, ranging from three to 21 years, based on the nature of the asset and the underlying pattern of economic benefit as reflected by future net cash inflows. The Company performs an impairment test of finite-lived intangibles whenever events or changes in circumstances indicate their carrying value may be impaired. The total gross carrying amount and accumulated amortization of definite-lived intangible assets at December 31, 2018 were $53.2 million and $28.8 million , respectively. The aggregate amount of amortization expense of intangible assets for the years ended December 31, 2018 , 2017 and 2016 was $6.2 million , $6.0 million and $6.1 million , respectively. The annual changes in the carrying amounts of patents, unpatented technologies, customer relationships and non-compete agreements and other intangible assets subject to amortization for the years ended December 31, 2018 and 2017 were as follows: (in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Patents Balance at January 1, 2017 $ 1,718 $ (528 ) $ 1,190 Acquisition 800 — $ 800 Amortization — (187 ) (187 ) Foreign exchange 2 — 2 Removal of fully amortized assets (170 ) 170 — Balance at December 31, 2017 2,350 (545 ) 1,805 Amortization — (107 ) (107 ) Removal of fully amortized assets (241 ) 241 — Balance at December 31, 2018 $ 2,109 $ (411 ) $ 1,698 (in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Unpatented Technology Balance at January 1, 2017 $ 21,162 $ (9,003 ) $ 12,159 Amortization — (1,976 ) (1,976 ) Foreign exchange 505 — 505 Balance at December 31, 2017 21,667 (10,979 ) 10,688 Amortization — (2,557 ) (2,557 ) Reclassifications (1) 277 — 277 Foreign exchange (90 ) $ — (90 ) Removal of fully amortized assets (1,192 ) 1,192 — Balance at December 31, 2018 $ 20,662 $ (12,344 ) $ 8,318 (1) Reclassifications in 2018 of $0.3 million in unpatented technology, with a corresponding reduction in other assets related to Technogrout asset acquisition. (in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Non-Compete Agreements, Trademarks and Other Balance at January 1, 2017 $ 6,727 (4,100 ) 2,627 Acquisition 9,260 — 9,260 Amortization — (2,495 ) (2,495 ) Foreign exchange 16 — 16 Removal of fully amortized assets (3,778 ) 3,778 — Balance at December 31, 2017 12,225 (2,817 ) 9,408 Acquisition 879 — 879 Amortization — (1,757 ) (1,757 ) Reclassifications (24 ) — (24 ) Removal of fully amortized asset (855 ) 855 — Balance at December 31, 2018 $ 12,225 $ (3,719 ) $ 8,506 (in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer Relationships Balance at January 1, 2017 $ 21,217 (14,945 ) 6,272 Acquisition 1,091 — 1,091 Amortization — (1,574 ) (1,574 ) Reclassifications (1) 626 — 626 Foreign exchange 394 — 394 Removal of fully amortized assets (5,650 ) 5,650 — Balance at December 31, 2017 17,678 (10,869 ) 6,809 Amortization — (1,430 ) (1,430 ) Foreign exchange (115 ) — (115 ) Balance at December 31, 2018 $ 17,563 $ (12,299 ) $ 5,264 (1) During 2017, $0.6 million was reclassified to customer relationships with a corresponding $0.6 million decrease in other assets related to the MS Decoupe acquisition. At December 31, 2018 , estimated future amortization of intangible assets was as follows: (in thousands) 2019 $ 5,319 2020 5,287 2021 4,807 2022 2,928 2023 2,124 Thereafter 3,321 $ 23,786 Indefinite-Lived Intangible Assets As of December 31, 2018 , the only indefinite-lived intangible asset, consisting of a trade name, totaled $0.6 million . Definite-lived and indefinite-lived assets, net, by segment as of December 31, 2018 and 2017 were as follows: December 31, 2017 Gross Accumulated Net (in thousands) Total Intangible Assets North America $ 30,775 $ (13,732 ) $ 17,043 Europe 23,762 (11,479 ) 12,283 Total $ 54,537 $ (25,211 ) $ 29,326 At December 31, 2018 Gross Accumulated Net (in thousands) Total Intangible Assets North America $ 30,825 $ (16,002 ) $ 14,823 Europe 22,353 (12,774 ) 9,579 Total $ 53,178 $ (28,776 ) $ 24,402

Acquisitions and Dispositions

Acquisitions and Dispositions	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Acquisitions and Dispositions	Acquisitions and Dispositions Under the business combinations topic of the FASB ASC 805, the Company accounts for acquisitions where the acquiree meets the definition of an acquired business as business combinations and ascribes acquisition-date fair values to the acquired assets and assumed liabilities. Provisional fair value measurements are made at the time of the acquisitions. Adjustments to those measurements may be made in subsequent periods, up to one year from the acquisition date, as information necessary to complete the analysis is obtained. Fair value of intangible assets are generally based on Level 3 inputs. CG Visions, Inc. In January 2017, to support our strategic initiative to sell engineered products solutions, the Company acquired CG Visions, Inc. ("CG Visions"), an Indiana corporation for $20.8 million . CG Visions provides scalable technologies and services in building information modeling ("BIM") technologies, estimation tools and software solutions to a number of the top 100 mid-sized to large builders in the United States, which are expected to complement and support the Company's sales in North America. During the third quarter of 2017, the Company finalized its fair value measurement of assets acquired and liabilities assumed in this acquisition. CG Visions assets and liabilities included other current assets of $0.5 million , noncurrent assets of $20.4 million , current liabilities and contingent consideration of $1.1 million . Included in noncurrent assets was goodwill of $10.1 million , which was assigned to the North America segment, and intangible assets of $10.3 million , both of which are not subject to tax-deductible amortization. The estimated weighted-average amortization period for the intangible assets is 7 years. Gbo Fastening Systems AB In January 2017, the Company acquired Gbo Fastening Systems AB ("Gbo Fastening Systems"), a Sweden limited company, for $10.2 million . Gbo Fastening Systems manufactures and sells a complete line of CE-marked structural fasteners as well as fastener dimensioning software for wood construction applications, currently sold mostly in northern and eastern Europe, which are expected to complement the Company's line of wood construction products in Europe. The Gbo Fastening Systems acquisition result in a $6.3 million gain on bargain purchase of a business, which was included in the consolidated statements of operation. Without speculating regarding the sellers' motivation, the Company does not know why Gbo Fastening Systems was sold below fair value, resulting in a nonrecurring bargain purchase gain for the Company. The following table represents the final allocation of the purchase price to the estimated fair value of the assets acquired and liabilities assumed in the Gbo Fastening Systems acquisition: (In thousands) Assets * Cash and cash equivalents $ 3,956 Accounts receivable 4,914 Inventory 13,591 Other current assets 760 Noncurrent assets 3,929 27,150 Liabilities Accounts payable 4,500 Other current liabilities and long-term liabilities 6,146 10,646 Total net assets 16,504 Gain on bargain purchase of a business, net of tax (6,336 ) Total purchase price 10,168 * Intangible assets acquired were determined to have little to no value, thus were not recognized Multi Services Dêcoupe S.A . In August 2016, the Company purchased all of the outstanding shares of Multi Services Dêcoupe S.A. ("MS Decoupe"), a Belgium public limited company, for $6.9 million . MS Decoupe primarily manufactures and distributes wood construction, plastic, and metal labeling products in Belgium and the Netherlands, including distributing the Company's products manufactured at the Company's production facility in France. With this acquisition, the Company could potentially offer the Belgium market a wider-range of its products, shorten delivery lead times, and expand the Company's sales presence into the Netherlands market. During the third quarter of 2017, the Company finalized its fair value measurement of assets acquired and liabilities assumed in this acquisition. MS Decoupe assets and liabilities included cash and cash equivalents of $1.4 million , other current assets of $1.6 million , noncurrent assets of $5.0 million , current liabilities of $0.6 million and noncurrent deferred income tax liabilities of $1.0 million . Included in noncurrent assets was goodwill of $1.4 million , which was assigned to the Europe segment, and intangible assets of $1.7 million , both of which are not subject to tax-deductible amortization. The estimated weighted-average amortization period for the intangible assets is 10 years. The results of operations of the businesses acquired in 2016 through 2018 have been in the Company’s consolidated results of operations since the date of the acquisition. They were not material to the Company on an individual or aggregate basis, and accordingly, pro forma results of such operations have not been presented. Sales of Gbo Poland and Gbo Romania As a result of incompatibility with Simpson's market strategy, the Company completed the sale of all of its equity in Gbo Fastening Systems' Poland and Gbo Romania subsidiaries on September 29, 2017 and October 31, 2017, respectively, for approximately $10.2 million , resulting in a loss of $0.2 million

Equity Investments

Equity Investments	12 Months Ended
	Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Equity Investments	Equity Investments In December 2016, the Company acquired a 25.0% equity interest in Ruby Sketch Pty Ltd. (“Ruby Sketch”), an Australian proprietary limited company, for $2.5 million . The Company has accounted for its ownership interest using the equity method of accounting and recognized Ruby Sketch investment at cost. The investment will fluctuate in future periods based on the Company’s allocable share of earnings or losses from the investment which is recognized through earnings.

Accrued Liabilities

Accrued Liabilities	12 Months Ended
	Dec. 31, 2018
Payables and Accruals [Abstract]
Accrued Liabilities	Accrued Liabilities Accrued liabilities consisted of the following: December 31, (in thousands) 2018 2017 Sales incentive and advertising accruals $ 36,312 $ 31,143 Vacation liability 2,901 8,993 Dividend payable 10,024 9,954 Labor related liabilities 22,365 20,196 Sales taxes payable and other 26,970 18,199 $ 98,572 $ 88,485

Debt

Debt	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Debt	Debt The Company has revolving lines of credit with various banks in the United States and Europe. Total available credit at December 31, 2018 was $304.0 million including revolving credit lines and an irrevocable standby letter of credit in support of various insurance deductibles. The Company’s primary credit facility is a $300.0 million revolving line of credit, which expires on July 23, 2021. Amounts borrowed under this credit facility will bear interest at an annual rate equal to either, at the Company’s option, (a) the rate for Eurocurrency deposits for the corresponding deposits of United States dollars appearing on Reuters LIBOR1screen page (the “LIBOR Rate”), adjusted for any reserve requirement in effect, plus a spread of 0.60% to 1.45% , determined quarterly based on the Company’s leverage ratio (at December 31, 2018 , the LIBOR Rate was 2.46% , or (b) a base rate , plus a spread of 0.00% to 0.45% , determined quarterly based on the Company’s leverage ratio. The base rate is defined in a manner such that it will not be less than the LIBOR Rate. The Company will pay fees for standby letters of credit at an annual rate equal to the applicable spread described above, and will pay market-based fees for commercial letters of credit. The Company is required to pay an annual facility fee of 0.15% to 0.30% of the available commitments under the credit agreement, regardless of usage, with the applicable fee determined on a quarterly basis based on the Company’s leverage ratio. There was no amount outstanding under this revolving line of credit as of December 31, 2018 and 2017, respectively. In addition to the $300.0 million credit facility, the Company’s borrowing capacity under other revolving credit lines totaled $3.4 million at December 31, 2018 . The other revolving credit lines charge interest ranging from 0.49% to 9.50% and have maturity dates of December 2019. The Company had $0.8 million outstanding under these other revolving lines of credit as of December 31, 2018 , and had no outstanding balance as of December 31, 2017. The Company and its subsidiaries are required to comply with various affirmative and negative covenants. The covenants include provisions that would limit the availability of funds as a result of a material adverse change to the Company’s financial position or results of operations. The Company was in compliance with its financial covenants under the loan agreement as of December 31, 2018 . The Company incurs interest costs, which include interest, maintenance fees and bank charges. The amount of costs incurred, capitalized, and expensed for the years ended December 31, 2018 , 2017 and 2016 , consisted of the following: Years Ended December 31, 2018 2017 2016 Interest costs incurred $ 1,224 $ 1,249 $ 1,167 Less: Interest capitalized (160 ) (72 ) (20 ) Interest expense $ 1,064 $ 1,177 $ 1,147 Capital Lease Obligations During 2017, the Company entered into two four -year lease agreements for certain office equipment with Cisco Systems Capital Corporation for a total of approximately $4.4 million , which was recorded in fixed assets as capital lease obligations. These capital lease obligations are included in current liabilities and other long-term liabilities in the accompanying consolidated balance sheets. The interest rates for these two capital leases are 2.89% and 3.50% , respectively, and the two leases will mature in May 2021 and July 2021, respectively. As of December 31, 2018 , the current portion of the outstanding liability for the leased equipment was approximately $1.1 million and the long-term portion was approximately $1.6 million

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Leases Certain properties occupied by the Company are leased. The leases expire at various dates through 2026 and generally require the Company to assume the obligations for insurance, property taxes and maintenance of the facilities. Rental expense for 2018 , 2017 and 2016 with respect to all leased property was approximately $6.9 million , $6.4 million and $5.9 million , respectively. At December 31, 2018 , minimum rental commitments under all non-cancelable leases were as follows: (in thousands) 2019 $ 6,962 2020 5,830 2021 4,481 2022 3,457 2023 2,399 Thereafter 8,563 Total $ 31,692 Some of these minimum rental commitments contain renewal options and provide for periodic rental adjustments based on changes in the consumer price index or current market rental rates. Other rental commitments provide options to cancel early without penalty. Future minimum rental payments under the earliest cancellation options are included in the minimum rental commitments in the table above. Other Contractual Obligations Purchase obligations consist of commitments primarily related to the acquisition, construction or expansion of facilities and equipment, consulting agreements, and minimum purchase quantities of certain raw materials. The Company is not a party to any long-term supply contracts with respect to the purchase of raw materials or finished goods. Debt interest obligations include annual facility fees on the Company’s primary line-of-credit facility. Interest on line-of-credit facilities was estimated based on historical borrowings and repayment patterns. At December 31, 2018 , other contractual obligations were as follows: (in thousands) As of December 31, 2018 Debt and Interest Obligations Capital Lease Obligations Purchase Obligations Total 2019 $ 1,234 $ 1,160 $ 28,438 $ 30,832 2020 450 1,160 2,367 3,977 2021 250 484 1,507 2,241 2022 — — 583 583 2023 — — — — Thereafter — — — — Total $ 1,934 $ 2,804 $ 32,895 $ 37,633 Employee Relations As of December 31, 2018, in the U.S. approximately 14% of our employees are represented by labor unions and are covered by collective bargaining agreements. The Company has two-facility locations with collective bargaining agreements covering tool and die craftsmen, maintenance workers, and sheet-metal workers. In Stockton, California, two union contracts will expire in September 2019 and June 2023, respectively. Also, the Company has two contracts in San Bernardino County, California that will expire in June 2022 and February 2021, respectively. The Company expects to agree on the extension with the existing labor union contract that will expire in September 2019, while parties are negotiating a new agreement. Based on current information and subject to future events and circumstances, the Company believes that, even if new agreements are not reached before the existing labor union contracts expire, it is not expected to have a material adverse effect on the Company's ability to provide products to customers or on the Company's profitability. Environmental The Company’s policy with regard to environmental liabilities is to accrue for future environmental assessments and remediation costs when information becomes available that indicates that it is probable that the Company is liable for any related claims and assessments and the amount of the liability is reasonably estimable. The Company does not believe that any such matters will have a material adverse effect on the Company’s financial condition, cash flows or results of operations. Litigation and Potential Claims From time to time, the Company is involved in various legal proceedings and other matters arising in the normal course of business. Corrosion, hydrogen enbrittlement, cracking, material hardness, wood pressure-treating chemicals, misinstallations, misuse, design and assembly flaws, manufacturing defects, labeling defects, product formula defects, inaccurate chemical mixes, adulteration, environmental conditions, or other factors can contribute to failure of fasteners, connectors, anchors, adhesives, specialty chemicals, such as fiber reinforced polymers, and tool products. In addition, inaccuracies may occur in product information, descriptions and instructions found in catalogs, packaging, data sheets, and the Company’s website. The resolution of any claim or litigation is subject to inherent uncertainty and could have a material adverse effect on the Company’s financial condition, cash flows or results of operations. Gentry Homes, Ltd. v. Simpson Strong-Tie Company Inc., et al. , Case No. 17-cv-00566, was filed in a federal district court in Hawaii against Simpson Strong-Tie Company Inc. and the Company on November 20, 2017. The Gentry case is a product of a previous state court class action, Nishimura v. Gentry Homes, Ltd., et al. , Civil No. 11-1-1522-07, which is now closed. The Nishimura case concerned alleged corrosion of the Company’s galvanized “hurricane straps” and mudsill anchor products used in a residential project in Ewa by Gentry, Honolulu, Hawaii. In the Nishimura case, the plaintiff homeowners and the developer, Gentry Homes, Ltd. (“Gentry”), arbitrated their dispute and agreed on a settlement in the amount of approximately $90 million . In the subsequent Gentry case, Gentry alleges breach of warranty and negligent misrepresentation by the Company related to its “hurricane strap” and mudsill anchor products, and demands general, special, and consequential damages from the Company in an amount to be proven at trial. Gentry also seeks pre-judgment and post-judgment interest, attorneys’ fees and costs, and other relief. The Company admits no liability and will vigorously defend the claims brought against it. At this time, the Company cannot reasonably ascertain the likelihood that it will be found responsible for substantial damages to Gentry. Based on the facts currently known, and subject to future events and circumstances, the Company believes that all or part of the claims brought against it in the Gentry case may be covered by its insurance policies. Charles Vitale, et al. v. D.R. Horton, Inc. and D.R. Horton-Schuler Homes, LLC , Civil No. 15-1-1347-07, a putative class action lawsuit, was filed in the Hawaii First Circuit on July 13, 2015, in which the plaintiff homeowners allege that all homes built by D.R Horton/D.R. Horton-Schuler Homes (collectively, “Horton Homes”) in the State of Hawaii have strap-tie holdowns that are suffering premature corrosion. The complaint alleges that various manufacturers make strap-tie holdowns that suffer from such corrosion. Although the plaintiffs’ original complaint did not specifically reference the Company’s products, their subsequent amended complaints make such reference. The amended complaints also allege that sill plates made by a third party are prematurely corroding. The Company is not currently a party to the Vitale lawsuit, but the lawsuit in the future could potentially involve the Company’s strap-tie holdowns and mudsill anchors. If claims are asserted against the Company in the Vitale case, it will vigorously defend any such claims, whether brought by the plaintiff homeowners or by Horton Homes. Based on the facts currently known, and subject to future events and circumstances, the Company believes that all or part of any claims that any party might bring against it related to the Vitale case may be covered by its insurance policies. Ronald Yee, et al. v. D.R. Horton, Inc. and D.R. Horton-Schuler Homes , LLC, Civil No. 18-1-1748-10, a putative class action lawsuit, was filed in the Hawaii First Circuit on October 30, 2018 in which the plaintiff homeowners allege that all homes built by D.R Horton/D.R. Horton-Schuler Homes (collectively, “Horton Homes”) in the State of Hawaii have strap-tie holdowns and mudsill anchors made by the Company that are suffering premature corrosion. The case is related to the Vitale matter discussed above. The complaint also alleges that sill plates made by a third party are prematurely corroding. The plaintiff homeowners have not sued the Company, and the Company is not currently a party to the Yee lawsuit. The lawsuit in the future could potentially involve the Company. If claims are asserted against the Company in the Yee case, it will vigorously defend any such claims, whether brought by the plaintiff homeowners or by Horton Homes. Based on the facts currently known, and subject to future events and circumstances, the Company believes that all or part of any claims that any party might bring against it related to the Yee case may be covered by its insurance policies Given the nature and the complexities involved in the Gentry , Vitale and Yee

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes On December 22, 2017, the Tax Reform Act was signed, which includes a broad range of tax reform proposals affecting businesses, including corporate tax rates, business deductions, and international tax provisions. Many of these provisions significantly differ from current U.S. tax law, resulting in financial reporting implications. Some of the changes include, but are not limited to, a U.S. corporate tax rate decrease from 35% to 21% effective for tax years beginning after December 31, 2017, the option to claim accelerated depreciation deductions, the transition of U.S. international taxation from a worldwide tax system to a territorial system, and a one-time transition tax on the mandatory deemed repatriation of foreign earnings as of December 31, 2017. While the Tax Reform Act provides for a territorial tax system, beginning in 2018, it includes two new U.S. tax base erosion provisions: the global intangible low-taxed income (“GILTI”) provisions and the base-erosion and anti-abuse tax (“BEAT”) provisions. The GILTI provisions impose a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. The guidance indicates that either accounting for deferred taxes related to GILTI inclusions or to treat any taxes on GILTI inclusions as period cost are both acceptable methods subject to an accounting policy election. Effective the first quarter of 2018, the Company has elected to treat any GILTI inclusions as a period cost. The BEAT provisions in the Tax Reform Act eliminate the deduction of certain base-erosion payments made to related foreign corporations, and impose a minimum tax if greater than regular tax. The Company is not subject to this tax and therefore has not included any tax impacts of BEAT in its consolidated financial statements for the year ended December 31, 2018. On December 22, 2017, Staff Accounting Bulletin No. 118 ("SAB 118") was issued by the SEC to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Tax Reform Act. During the year ended December 31, 2017, the Company recorded provisional amounts for $2.8 million of deferred tax benefit recorded in connection with the re-measurement of deferred tax assets and liabilities and $3.8 million of current tax expense recorded in connection with the transition tax on the mandatory deemed repatriation of foreign earnings. As of December 31, 2018, we have completed our accounting for the tax effects of the Tax Reform Act. Subsequent adjustments to these amounts resulted in additional tax benefits recorded during 2018 of approximately $0.7 million and $0.6 million , respectively. Management will continue to monitor any changes in tax law. The provision for income taxes from operations consisted of the following: Years Ended December 31, (in thousands) 2018 2017 2016 Current Federal $ 27,410 $ 36,077 $ 39,649 State 9,515 6,357 7,053 Foreign 4,605 3,068 3,333 Deferred Federal 3,179 6,093 260 State 263 544 13 Foreign 523 (338 ) (1,142 ) $ 45,495 $ 51,801 $ 49,166 Income and loss from operations before income taxes for the years ended December 31, 2018 , 2017 , and 2016 , respectively, consisted of the following: Years Ended December 31, (in thousands) 2018 2017 2016 Domestic $ 169,109 $ 132,105 $ 131,827 Foreign 3,019 12,313 7,073 $ 172,128 $ 144,418 $ 138,900 At December 31, 2018 , the Company had $37.0 million of pre-tax loss carryforwards in various foreign taxing jurisdictions, of which $0.9 million will begin to expire between 2019 and 2025. The remaining tax losses can be carried forward indefinitely. At December 31, 2018 , and 2017 , the Company had deferred tax valuation allowances of $13.3 million and $11.1 million , respectively. The valuation allowance increased $2.1 million and $4.2 million for the years ended December 31, 2018 and 2017 , respectively. The increase in 2018 valuation allowances was primarily a result of increases in foreign losses in jurisdictions where the Company has recorded a full valuation allowance. The increase in 2017 valuation allowances was primarily due to the Company's remaining foreign tax credits carryforward in the U.S. As of December 31, 2018, the Company believes it is more likely than not that these foreign tax credits will expire unrealized under the Tax Reform Act. The Company has not historically recorded federal income taxes on the undistributed earnings of its foreign subsidiaries because such earnings are reinvested and, in the Company’s opinion, will continue to be reinvested indefinitely. The Tax Reform Act provided for a one-time transition tax on the mandatory deemed repatriation of foreign earnings through the year ended December 31, 2017, and as a result, the Company recorded a net $3.2 million tax liability based on undistributed foreign earnings of approximately $23.9 million . As a result of the implications of the 2017 Tax Reform Act and in satisfying Management’s 2020 Plan, the Company announced one-time distributions from select foreign jurisdictions to the U.S. during 2018. The Company repatriated approximately $63.0 million between the third and fourth quarter and recorded taxes of approximately $1.0 million which is primarily comprised of withholding taxes and state income taxes. The Company intends to limit any possible future distributions to earnings previously taxed in the U.S. As a result, the Company has not recognized a deferred tax liability on its investment in foreign subsidiaries. Determination of the related amount of unrecognized deferred U.S. income taxes is not practicable because of the complexities associated with this hypothetical calculation. Reconciliations between the statutory federal income tax rates and the Company’s effective income tax rates as a percentage of income before income taxes for its operations were as follows: Years Ended December 31, (in thousands) 2018 2017 2016 Federal tax rate 21.0 % 35.0 % 35.0 % State taxes, net of federal benefit 4.5 % 3.2 % 3.4 % Tax benefit of domestic manufacturing deduction — % (2.0 )% (2.5 )% Mandatory deemed repatriation of foreign earnings — % 2.7 % — % Change in U.S. tax rate applied to deferred taxes — % (1.9 )% — % Change in valuation allowance 1.3 % 1.3 % (0.1 )% True-up of prior year tax returns to tax provision (1.2 )% (0.5 )% (0.2 )% Difference between United States statutory and foreign local tax rates 0.5 % (0.8 )% (0.3 )% Change in uncertain tax position (0.1 )% — % (0.2 )% Other 0.4 % (1.1 )% 0.3 % Effective income tax rate 26.4 % 35.9 % 35.4 % The decrease in the Company’s effective tax rate is primarily driven by the reduced U.S. federal income tax rate in 2018. The tax effects of the significant temporary differences that constitute the deferred tax assets and liabilities at December 31, 2018 and 2017 , respectively, were as follows: December 31, (in thousands) 2018 2017 Deferred asset taxes State tax $ 919 $ 1,390 Workers’ compensation 785 822 Health claims 445 487 Vacation liability 370 1,008 Allowance for doubtful accounts 171 104 Inventories 5,659 5,385 Sales incentive and advertising allowances 799 709 Stock-based compensation 3,074 2,967 Unrealized foreign exchange gain or loss 440 291 Foreign tax credit carryforwards 5,043 4,453 Uncertain tax positions’ unrecognized tax benefits 39 31 Foreign tax loss carry forward 8,091 6,892 Other 1,813 1,291 $ 27,648 $ 25,830 Less valuation allowances (13,254 ) (11,114 ) Total deferred asset taxes $ 14,394 $ 14,716 Deferred tax liabilities Depreciation $ (9,189 ) $ (7,050 ) Goodwill and other intangibles amortization (13,027 ) (11,331 ) Tax effect on cumulative translation adjustment (497 ) (487 ) Total deferred tax liabilities (22,713 ) (18,868 ) Total Deferred tax asset/(liability) $ (8,319 ) $ (4,152 ) A reconciliation of the beginning and ending amounts of unrecognized tax benefits in 2018 , 2017 and 2016 , respectively, was as follows, including foreign translation amounts: Reconciliation of Unrecognized Tax Benefits 2018 2017 2016 Balance at January 1 $ 1,895 $ 1,119 $ 1,107 Additions based on tax positions related to prior years — 660 204 Reductions based on tax positions related to prior years (171 ) (1 ) — Additions for tax positions of the current year 100 319 155 Lapse of statute of limitations (67 ) (202 ) (347 ) Balance at December 31 $ 1,757 $ 1,895 $ 1,119 Tax positions of $0.1 , $0.0 , and $0.0 million are included in the balance of unrecognized tax benefits at December 31, 2018 , 2017 , and 2016 , respectively, which if recognized, would reduce the effective tax rate. The Company recognizes accrued interest and penalties related to unrecognized tax benefits in income tax expense, which is a continuation of the Company’s historical accounting policy. During the year ended December 31, 2018 and 2017 , accrued interest increased by $5 thousand and $0.2 million , respectively, and during the years ended 2016 , accrued interest decreased by $61 thousand . The Company had accrued $0.4 million for each of the fiscal years ended 2018 and 2017 and $0.2 million for the year ended 2016 , for the potential payment of interest, before income tax benefits. At December 31, 2018 , the Company remained subject to United States federal income tax examinations for the tax years 2015 through 2018 . In addition, the Company remained subject to state, local and foreign income tax examinations primarily for the tax years 2013 through 2018

Retirement Plans

Retirement Plans	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Retirement Plans	Retirement Plans The Company has six defined contribution retirement plans covering substantially all salaried employees and nonunion hourly employees. On January 1, 2015, the Simpson Manufacturing Co., Inc. 401(k) Profit Sharing Plan for Salaried Employees was amended, restated and superseded by the Simpson Manufacturing Co., Inc. 401(k) Profit Sharing Plan (the “Restated Plan”), and the Simpson Manufacturing Co., Inc. 401(k) Profit Sharing Plan for Hourly Employees was merged with and incorporated into the Restated Plan. The Restated Plan, covering United States employees, provides for quarterly safe harbor contributions, limited to 3% of the employees quarterly eligible compensation and for annual discretionary contributions, subject to certain limitations, but in no event are total contributions more than the amounts permitted under the Internal Revenue Code as deductible expense. The discretionary amounts for 2016, 2017 and 2018 were equal to 7% of qualifying salaries or wages of the covered employees. The other four plans, covering the Company’s European and Canadian employees, require the Company to make contributions ranging from 3% to 15% of the employees’ compensation. The total cost for these retirement plans for the years ended December 31, 2018 , 2017 and 2016 , was $15.8 million , $14.2 million and $10.1 million , respectively. We participate in various multiemployer benefit plans that cover some of our employees who are represented by labor unions . We make periodic contributions to these plans in accordance with the terms of applicable collective bargaining agreements and laws but do not sponsor or administer these plans . We do not participate in any multiemployer benefit plans for which we consider our contributions to be individually significant. If we were to otherwise withdraw from participation in any of these plans, applicable law would require us to fund our allocable share of the unfunded vested benefits, which is known as a withdrawal liability. As of December 31, 2018 , we believe that there was no probable withdrawal liability under the multiemployer benefit pension plans under the terms of collective-bargaining agreements that cover its union-represented employees. Our total contribution to various industry-wide, union-sponsored pension funds and a statutorily required pension fund for employees in the U.S. and Europe were $4.5 million , $4.0 million and $3.1 million for the years ended December 31, 2018 , 2017 and 2016

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions During 2018 , the Company identified certain purchases of goods and services from companies where the Chief Executive Officer of the Company serves as a director on the respective company providing the goods or services. The amount of goods and services purchased by the Company pursuant to these arrangements was not material to the Company’s consolidated statement of income and cash flows for the year ended December 31, 2018

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Segment Information	Segment Information The Company is organized into three reporting segments. The segments are defined by the regions where the Company’s products are manufactured, marketed and distributed to the Company’s customers. The three regional segments are the North America segment (comprised primarily of the Company's operations in the United States and Canada), the Europe segment and the Asia/Pacific segment (comprised of the Company’s operations in Asia, the South Pacific, and the Middle East). These segments are similar in several ways, including the types of materials used, the production processes, the distribution channels and the product applications. The Administrative & All Other column primarily includes expenses such as self-insured workers compensation claims for employees of the Company’s venting business, which was sold in 2010, stock-based compensation for certain members of management, interest expense, foreign exchange gains or losses and income tax expense, as well as revenues and expenses related to real estate activities, such as gain on sale of property, rental income and depreciation expense on the Company’s property in Vacaville, California. In November 2018, the Vacaville property was sold for $17.5 million , net of closing costs and sales price adjustments and resulted in a pre-tax gain of $8.8 million . The following table shows certain measurements used by management to assess the performance of the segments described above as of December 31, 2018 , 2017 and 2016 , respectively: (in thousands) North Europe Asia/ Administrative Total 2018 Net sales $ 910,587 $ 159,027 $ 9,195 $ — $ 1,078,809 Sales to other segments * 2,279 1,773 28,292 — 32,344 Income from operations 164,453 (3,026 ) 2,040 8,865 172,332 Depreciation and amortization 30,505 6,297 1,794 797 39,393 Impairment of goodwill — 6,686 — — 6,686 Significant non-cash charges 6,340 1,169 48 3,619 11,176 Provision for income taxes 39,638 2,947 113 2,797 45,495 Capital expenditures and business acquisitions, net of cash acquired 27,059 2,556 1,702 — 31,317 Total assets 1,119,012 157,437 25,644 (280,430 ) 1,021,663 (in thousands) North America Europe Asia/ Pacific Administrative & All Other Total 2017 Net sales $ 803,697 $ 165,155 $ 8,173 $ — $ 977,025 Sales to other segments * 3,237 959 20,715 — 24,911 Income (loss) from operations 132,995 2,723 1,296 901 137,915 Depreciation and amortization 25,745 5,832 1,246 901 33,724 Gain on bargain purchase of a business — 6,336 — — 6,336 Significant non-cash charges 9,861 1,509 65 2,473 13,908 Provision for income taxes 47,434 2,124 419 1,824 51,801 Capital expenditures and business acquisitions, net of 70,040 11,411 4,511 — 85,962 Total assets 953,033 208,640 26,820 (150,970 ) 1,037,523 (in thousands) North America Europe Asia/ Pacific Administrative & All Other Total 2016 Net sales $ 742,021 $ 111,274 $ 7,366 $ — $ 860,661 Sales to other segments * 2,512 570 28,690 — 31,772 Income (loss) from operations 137,466 2,115 1,807 (178 ) 141,210 Depreciation and amortization 19,433 5,809 1,208 1,477 27,927 Significant non-cash charges 9,124 1,052 113 3,657 13,946 Provision for (benefit from) income taxes 45,547 1,428 721 1,470 49,166 Capital expenditures and business acquisitions, net of 37,652 8,461 1,250 — 47,363 Total assets 853,826 165,121 25,118 (64,091 ) 979,974 * Sales to other segments are eliminated on consolidation. Cash collected by the Company’s United States subsidiaries is routinely transferred into the Company’s cash management accounts, and therefore has been included in the total assets of “Administrative & All Other.” Cash and short-term investment balances in “Administrative & All Other” were $113.6 million , $80.2 million and $137.4 million as of December 31, 2018 , 2017 and 2016 , respectively. As of December 31, 2018 , the Company had $45.5 million , or 28.4% , of its cash and cash equivalents held outside the United States in accounts belonging to the Company’s various foreign operating entities. The majority of this balance is held in foreign currencies and could be subject to additional taxation if repatriated to the United States. The significant non-cash charges comprise compensation related to equity awards under the Company's stock-based incentive plans and the Company's employee stock bonus plan. The Company’s measure of profit or loss for its reportable segments is income (loss) from operations. The reconciling amounts between consolidated income before tax and consolidated income from operations are net interest income (expense), loss in equity method investment, gain on bargain purchase of a business, and loss on disposal of a business. Interest income (expense) is primarily attributed to “Administrative & All Other.” The following table shows the geographic distribution of the Company’s net sales and long-lived assets as of December 31, 2018 , 2017 and 2016 , respectively: 2018 2017 2016 (in thousands) Net Long-Lived Net Long-Lived Net Long-Lived United States $ 860,482 $ 210,063 $ 758,181 $ 223,184 $ 702,071 $ 192,787 Canada 46,874 4,257 43,176 4,650 38,269 4,473 United Kingdom 27,194 1,417 23,157 1,459 20,751 1,183 Germany 22,950 13,221 21,821 14,153 33,062 12,582 France 40,182 7,891 36,677 9,152 20,905 8,349 Poland 10,200 2,794 20,409 2,471 6,633 1,830 Sweden 15,461 1,154 16,421 1,068 — — Denmark 11,682 1,454 14,723 1,601 15,728 1,249 Norway 12,324 — 12,902 229 — — Switzerland 6,939 8,067 5,593 8,748 6,549 8,469 Australia 6,119 199 5,501 268 4,741 239 Belgium 5,547 1,961 5,050 2,065 1,286 1,798 The Netherlands 5,068 81 4,834 110 4,909 21 New Zealand 3,061 111 2,604 130 2,474 163 Chile 3,233 41 2,314 61 1,572 56 Other countries 1,493 11,635 3,662 12,710 1,711 7,471 $ 1,078,809 $ 264,346 $ 977,025 $ 282,059 $ 860,661 $ 240,670 Net sales and long-lived assets, excluding intangible assets, are attributable to the country where the sales or manufacturing operations are located. The Company's wood construction products include connectors, truss plates, fastening systems, fasteners and pre-fabricated shearwalls and are used for connecting and strengthening wood-based construction primarily in the residential construction market. Its concrete construction products include adhesives, specialty chemicals, mechanical anchors, carbide drill bits, powder actuated tools and reinforcing fiber materials and are used for restoration, protection or strengthening concrete, masonry and steel construction in residential, industrial, commercial and infrastructure construction. The following table show the distribution of the Company’s net sales by product for the years ended December 31, 2018 , 2017 and 2016 , respectively: (in thousands) 2018 2017 2016 Wood Construction $ 913,202 $ 833,200 $ 732,414 Concrete Construction 165,317 143,102 128,247 Other 290 723 — Total $ 1,078,809 $ 977,025 $ 860,661 No customer accounted for as much as 10% of net sales for the years ended December 31, 2018 , 2017 and 2016

Selected Quarterly Financial Da

Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Financial Data (Unaudited)	Selected Quarterly Financial Data (Unaudited) In 2018, the Company recorded out-of-period adjustments, which increased cost of sales and decreased general and administrative expenses in equal amounts. Such adjustment only applied to the North America segment, which resulted from recording certain depreciation expense on company-owned real estate as general and administrative expense rather than cost of goods sold. Income from operations and net income for each of the quarters as presented below were not affected by the adjustment. In 2018, the Company changed its presentation of its consolidated statement of operations to display foreign exchange gain (loss), net, as a separate item below income from operations. Foreign exchange gain (loss), net, was previously included in general and administrative expenses and in income from operations. Income before tax and net income for each of the quarters as presented below were not affected by the change in presentation. The following table sets forth selected quarterly financial data for each of the quarters in 2018 and 2017 , respectively: (in thousands, except per share amounts) 2018 2017 Fourth Third Second First Fourth Third Second First Net sales $ 241,845 $ 284,178 $ 308,007 $ 244,779 $ 231,681 $ 262,476 $ 263,002 $ 219,867 Cost of sales 143,409 150,282 167,442 137,157 129,777 143,338 140,139 120,390 Gross profit 98,436 133,896 140,565 107,622 101,904 119,138 122,863 99,477 Research and development and other engineering 10,216 10,441 11,249 11,150 12,565 11,265 11,967 11,819 Selling 26,278 26,879 29,201 27,573 28,753 27,867 28,646 29,637 General and administrative 45,195 37,356 39,354 37,188 36,236 33,441 37,586 35,845 Total operating expenses 81,689 74,676 79,804 75,911 77,554 72,573 78,199 77,301 Net gain on disposal of assets (8,810 ) (460 ) (125 ) (1,184 ) (13 ) (147 ) 50 (50 ) Impairment of goodwill 6,686 — — — — — — — Income from operations 18,871 59,680 60,886 32,895 24,363 46,712 44,614 22,226 Loss in equity investment, before tax (11 ) (30 ) 2 (24 ) (33 ) (13 ) (12 ) (28 ) Foreign exchange gain (loss) (571 ) 1,242 (142 ) (99 ) 342 (16 ) 523 403 Interest (expense) income, net (239 ) (58 ) (184 ) (90 ) (104 ) (296 ) (199 ) (189 ) Gain (adjustment) on bargain purchase of a business — — — — — (2,052 ) — 8,388 Gain (loss) on disposal of a business — — — — (654 ) 443 — — Income before income taxes 18,050 60,834 60,562 32,682 23,914 44,778 44,926 30,800 Provision for income taxes 5,293 16,473 16,476 7,253 10,829 16,581 16,712 7,679 Net income $ 12,757 $ 44,361 $ 44,086 $ 25,429 $ 13,085 $ 28,197 $ 28,214 $ 23,121 Earnings per share of common stock: 0 Basic $ 0.28 $ 0.96 $ 0.95 $ 0.55 $ 0.28 $ 0.60 $ 0.59 $ 0.49 Diluted 0.28 0.95 0.94 0.54 0.27 0.59 0.59 0.48 Cash dividends declared per share of common stock $ 0.22 $ 0.22 $ 0.22 $ 0.21 $ — $ 0.42 $ 0.21 $ 0.18 Basic earnings per share of common stock (“EPS”) for each of the quarters presented above is computed based on the weighted average number of shares of common stock outstanding during the quarter. Diluted EPS is computed based on the weighted average number of shares of common stock plus the effect of dilutive potential shares of common stock outstanding during the quarter using the treasury stock method. Dilutive potential shares of common stock include outstanding stock options and stock awards.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On January 28, 2019 , the Board declared a cash dividend of $0.22 per share of our common stock, estimated to be $9.8 million in total. The record date for the dividend will be April 4, 2019 , and will be paid on April 25, 2019 . At the same meeting, the Board authorized the Company to repurchase up to $100.0 million of the Company's common stock. The authorization is in effect from January 1, 2019 through December 31, 2019. During February 2019, a tentative settlement in principle was reached to resolve a certain pending legal proceeding outstanding as of the year end. As a result, the Company recorded a charge to Administrative expense, which decreased net income by approximately $2.9 million after taxes from the amount previously disclosed in the Company’s earnings release dated February 4, 2019. Diluted earnings per share decreased from $2.78 reported previously to $2.72

SCHEDULE II VALUATION AND QUALI

SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS	12 Months Ended
	Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS	SCHEDULE II Simpson Manufacturing Co., Inc. and Subsidiaries VALUATION AND QUALIFYING ACCOUNTS for the years ended December 31, 2018 , 2017 and 2016 Column A Column B Column C Column D Column E Additions Charged Charged Balance at to Costs to Other Balance (in thousands) Beginning and Accounts — at End Classification of Year Expenses Write-offs Deductions of Year Year to date December 31, 2018 Allowance for doubtful accounts $ 996 $ 569 $ 201 $ — $ 1,364 Allowance for sales discounts 2,956 361 — — 3,317 Allowance for deferred tax assets 11,114 2,477 337 13,254 Year to date December 31, 2017 Allowance for doubtful accounts 895 66 — (35 ) 996 Allowance for sales discounts 3,050 (94 ) — — 2,956 Allowance for deferred tax assets 6,868 5,765 — 1,519 11,114 Year to date December 31, 2016 Allowance for doubtful accounts 1,142 (83 ) — 164 895 Allowance for sales discounts 2,706 344 — — 3,050 Allowance for deferred tax assets 7,575 358 — 1,065 6,868

Operations and Summary of Sig_2

Operations and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Principles of Consolidation	Principles of Consolidation The accompanying consolidated financial statements include the accounts of Simpson Manufacturing Co., Inc. and its subsidiaries. Investments in 50% or less owned entities are accounted for using either cost or the equity method. The Company consolidates all variable interest entities ("VIEs") where it is the primary beneficiary. There were no VIEs as of December 31, 2018 or 2017
Use of Estimates	Use of Estimates
Cash Equivalents	Cash Equivalents Cash and cash equivalents include cash on hand, cash in banks and cash equivalents, which are highly liquid investments with an original or remaining maturity of three months or less at the time of purchase to be cash equivalents.
Allowance For Doubtful Accounts	Allowance for Doubtful Accounts The Company evaluates the collectability of specific customer accounts that would be considered doubtful based on the customer’s financial condition, payment history, credit rating and other factors that the Company considers relevant, or accounts that the Company assigns for collection. The Company reserves for the portion of those outstanding balances that the Company believes it is not likely to collect based on historical collection experience. The Company also reserves 100%
Concentration of Credit Risk	Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash in banks, short-term investments in money market funds and trade accounts receivable. The Company maintains its cash in demand deposit and money market accounts held primarily at 17
Inventory Valuation	Inventory Valuation Inventories are stated at the lower of cost or net realizable value. Cost includes all costs incurred in bringing each product to its present location and condition, as follows: • Raw materials and purchased finished goods for resale — principally valued at cost determined on a weighted average basis; and • In-process products and finished goods — cost of direct materials and labor plus attributable overhead based on a normal level of activity.
Warranties and Recalls	Warranties and recalls
Fair Value of Financial Instruments	Fair Value of Financial Instruments Fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that is determined based on assumptions that market participants would use in pricing an asset or a liability. Assets and liabilities recorded at fair value are measured and classified under a three-tier fair valuation hierarchy based on the observability of the inputs available in the market: Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities; Level 2 inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument; and Level 3 inputs are unobservable inputs based on the Company’s assumptions used to measure assets and liabilities at fair value. The fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. As of December 31, 2018 and 2017 , the Company’s investments included in cash equivalents consisted of only money market funds, which are the Company’s primary financial instruments and carried at cost, approximating fair value, based on Level 1 inputs. The balance of the Company’s primary financial instruments as of December 31, 2018 and 2017 was $0.2 million and $5.3 million
Property, Plant and Equipment including Depreciation and Amortization	Property, Plant and Equipment Property, plant and equipment are carried at cost. Major renewals and betterments are capitalized. Maintenance and repairs are expensed as incurred. When assets are sold or retired, their costs and accumulated depreciation are removed from the accounts, and the resulting gains or losses are reflected in the accompanying Consolidated Statements of Operations. The “Intangibles—Goodwill and Other” topic of the FASB ASC provides guidance on capitalization of the costs incurred for computer software developed or obtained for internal use. The Company capitalizes qualified external costs and internal costs related to the purchase and implementation of software projects used for business operations and engineering design activities. Capitalized software costs primarily include purchased software, internal costs and external consulting fees. Capitalized software projects are amortized over the estimated useful lives of the software. Depreciation and Amortization Software, including amounts capitalized for internally developed software is amortized on a straight-line basis over an estimated useful life of three to five years. Machinery and equipment is depreciated using accelerated methods over an estimated useful life of three to ten years. Buildings and site improvements are depreciated using the straight-line method over their estimated useful lives, which range from 15 to 45 years. Leasehold improvements are amortized using the straight-line method over the shorter of
Common Stock and Preferred Stock	Preferred Stock The Board has the authority to issue the authorized and unissued preferred stock in one or more series with such designations, rights and preferences as may be determined from time to time by the Board. Accordingly, the Board is empowered, without stockholder approval, to issue preferred stock with dividend, redemption, liquidation, conversion, voting or other rights that could adversely affect the voting power or other rights of the holders of the Company’s common stock. Common Stock Subject to the rights of holders of any preferred stock that may be issued in the future, holders of common stock are entitled to receive such dividends, if any, as may be declared from time to time by the Company’s Board of Directors (the "Board") out of legally available funds, and in the event of liquidation, dissolution or winding-up of the Company, to share ratably in all assets available for distribution. The holders of common stock have no preemptive or conversion rights. Subject to the rights of any preferred stock that may be issued in the future, the holders of common stock are entitled to one vote per share on any matter submitted to a vote of the stockholders. A director in an uncontested election is elected if the votes cast “for” such director’s election exceed the votes cast “against” such director’s election, except that, if a stockholder properly nominates a candidate for election to the Board, the candidates with
Comprehensive Income or Loss	Comprehensive Income or Loss
Foreign Currency Translation	Foreign Currency Translation
Revenue Recognition	Revenue Recognition
Sales Taxes	Sales Taxes
Cost of Sales	Cost of Sales
Tool and Die Costs	Tool and Die Costs
Shipping and Handling Fees and Costs	Shipping and Handling Fees and Costs
Product and Software Research and Development Costs	Product and Software Research and Development Costs Product research and development costs, which are included in operating expenses and are charged against income as incurred, were $10.8 million , $10.6 million and $10.8 million in 2018 , 2017 and 2016 , respectively. The types of costs included as product research and development expenses was revised in 2017 and prior years to include all related personnel costs including salary, benefits, retirement, stock-based compensation costs, as well as computer and software costs, professional fees, supplies, tools and maintenance costs. In 2018 , 2017 and 2016
Selling Costs, General and Administrative Costs	General and Administrative Costs
Advertising Costs	Advertising Costs Advertising costs are included in selling expenses are expensed when the advertising occurs and were $7.6 million , $9.6 million and $7.1 million in 2018 , 2017 , and 2016
Accounting for Stock-Based Compensation	Accounting for Stock-Based Compensation The Company recognizes stock-based expense related to stock options and restricted stock awards on a straight-line basis, net of forfeitures, over the requisite service period of the awards, which is generally the vesting term of four years. Stock-based expense related to performance share grants are measured based on grant date fair value and expensed on a graded basis over the service period of the awards, which is generally a performance period of three
Income Taxes	Income Taxes Income taxes are calculated using an asset and liability approach. The provision for income taxes includes federal, state and foreign taxes currently payable and deferred taxes, due to temporary differences between the financial statement and tax bases of assets and liabilities. In addition, future tax benefits are recognized to the extent that realization of such benefits is more likely than not. This method gives consideration to the future tax consequences of the deferred income tax items and immediately recognizes changes in income tax laws in the year of enactment. On December 22, 2017, the President of the United States signed into law
Net Income per Common Share	Net Income per Share
Adoption of Statements of Financial Accounting Standards	Recently Adopted Accounting Standards In May 2014, the FASB issued Accounting Standards Update No. 2014-09 (later codified as ASC 606), Revenue from Contracts with Customers (“ASC 606”), which supersedes nearly all existing revenue recognition guidance under GAAP. ASC 606 provides a five-step model for revenue recognition to be applied to all revenue contracts with customers. The five-step model includes: (1) determination of whether a contract, an agreement between two or more parties that creates legally enforceable rights and obligations, exists; (2) identification of the performance obligations in the contract; (3) determination of the transaction price; (4) allocation of the transaction price to the performance obligations in the contract; and (5) recognition of revenue when (or as) the performance obligations are satisfied. The core principle of ASC 606 is that an entity should recognize revenue for the transfer of goods or services equal to the amount that it expects to be entitled to receive for those goods or services. ASC 606 also requires additional disclosures about the nature, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments. The standard is effective for annual and interim periods beginning after December 15, 2017 and permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (modified retrospective method). The Company adopted the new revenue standard on January 1, 2018 using the modified retrospective approach. Refer to Note 2 for additional information. In October 2016, the FASB issued Accounting Standards Update ("ASU") No. 2016-16, Income Taxes (Topic 740), Intra-Entity Transfers of Assets Other Than Inventory ("ASU 2016-16"), which requires companies to account for the income tax effects of intercompany sales and transfers of assets other than inventory when the transfer occurs. Current guidance requires companies to defer the income tax effects of intercompany transfers of assets until the asset has been sold to an outside party or otherwise recognized. On January 1, 2018, the Company adopted ASU 2016-16 using a modified retrospective approach. Adoption of ASU 2016-16 had no material effect on the Company's consolidated financial statements and footnote disclosures. In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment ("ASU 2017-04"), which eliminates the requirement to calculate the implied fair value of goodwill to measure a goodwill impairment charge or Step 2 of the goodwill impairment analysis. Instead, an impairment charge will be recorded based on the excess of a reporting unit's carrying amount over its fair value using Step 1 of the goodwill impairment analysis. On January 1, 2018, the Company prospectively adopted ASU 2017-04. In 2018, the Company applied ASU 2017-04 to the Company's measurement of impairment for its Denmark reporting unit. Refer to Note 9 for additional information. In February 2018, the FASB issued ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income ("ASU 2018-02") . ASU 2018-02 allows but not require a reclassification from Accumulated other Comprehensive Income to Retained Earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017. The amendments in this ASU are effective for fiscal years beginning after December 15, 2018 and for interim periods therein. During the fourth quarter of 2018, the Company early adopted the new accounting guidance and elected to reclass the stranded tax effects under ASU 2018-02. The election resulted in a reclass of $0.4 million to retained earnings. All other issued and effective accounting standards during 2018 were determined to be not relevant or material to the Company. Recently Issued Accounting Standards Not Yet Adopted In February 2016, the FASB issued ASU No. 2016-02, (Topic 842), Leases (“ASU 2016-02”). ASU 2016-02 core requirement is to recognize the assets and liabilities that arise from leases including those leases classified as operating leases. The amendments require a lessee to recognize a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term in the statement of financial position. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset to not recognize lease assets and lease liabilities. If a lessee makes this election, it should recognize lease expense for such leases generally on a straight-line basis over the lease term. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with early adoption permitted. Optional transition method - ASC 2018-11, Topic 842, Targeted Improvements (issued in July 2018) provide entities with an additional (and optional) transition method to adopt the new lease standard. This additional transition method allows a cumulative effect adjustment to the opening balance of retained earnings in the period of adoption without adjusting the comparative periods presented. On January 1, 2019, the Company will adopt the new lease standard using the optional transition method. During the fourth quarter of 2018, in preparation for the adoption of the new lease accounting standard, the Company has implemented internal controls and a new lease accounting information system to enable the preparation of financial information. The Company will elect and apply practical transition expedients of not reassessing whether any expired or existing contracts are or contain leases; not reassessing the lease classification for any expired or existing leases and not reassessing initial direct costs for any existing leases. The adoption of Topic 842 will result in recognition of right-of-use ("ROU") assets and lease liabilities of approximately $36.0 million to $37.0 million and approximately $35.0 million to $36.0 million , respectively on January 1, 2019, on the Company’s balance sheets. The most significant impact from recognition of ROU assets and lease liabilities is related primarily to facilities and auto operating leases.

Net Income per Share (Tables)

Net Income per Share (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Reconciliation of basic earnings per share (EPS) to diluted EPS	The following shows a reconciliation of basic earnings per share (“EPS”) to diluted EPS: For the Year Ended December 31, (in thousands, except per-share amounts) 2018 2017 2016 Net income available to common stockholders $ 126,633 $ 92,617 $ 89,734 Basic weighted average shares outstanding 46,213 47,486 48,084 Dilutive effect of potential common stock equivalents 327 288 211 Diluted weighted average shares outstanding 46,540 47,774 48,295 Net earnings per share: Basic $ 2.74 $ 1.95 $ 1.87 Diluted $ 2.72 $ 1.94 $ 1.86

Shareholders' equity (Tables)

Shareholders' equity (Tables)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Schedule of components of accumulated other comprehensive income	The following shows the components of accumulated other comprehensive income or loss as of December 31, 2018 and 2017 , respectively: Foreign Currency Translation Pension Benefit Total (in thousands) Balance at January 1, 2016 $ (27,552 ) $ (1,024 ) $ (28,576 ) Other comprehensive income before reclassification net of tax benefit (expense) of ($222) and $87, respectively (3,920 ) (474 ) (4,394 ) Balance at December 31, 2016 (31,472 ) (1,498 ) (32,970 ) Other comprehensive loss net of tax benefit (expense) of ($0) and $37, respectively 21,273 (944 ) 20,329 Amounts reclassified from accumulative other comprehensive income, net of $0 tax 145 — 145 Balance at December 31, 2017 (10,054 ) (2,442 ) (12,496 ) Other comprehensive loss net of tax benefit (expense) of $0 and $59, respectively (12,911 ) 757 (12,154 ) Balance at December 31, 2018 $ (22,965 ) $ (1,685 ) $ (24,650 )

Stock-Based Compensation Plans

Stock-Based Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Company's stock-based compensation activity	The following table summarizes the Company’s stock option activity for the year ended December 31, 2018: Shares Weighted- Weighted- Aggregate Non-Qualified Stock Options Outstanding at January 1, 2018 28 $ 29.66 0.1 $ 780 Exercised (23 ) $ 29.66 Forfeited (5 ) $ 29.66 Outstanding and exercisable at December 31, 2018 — $ — — $ — Fiscal Years Ended December 31, (in thousands) 2018 2017 2016 Stock-based compensation expense recognized in operating expenses $ 10,356 $ 12,744 $ 13,113 Tax benefit of stock-based compensation expense in provision for income taxes 2,476 4,575 4,757 Stock-based compensation expense, net of tax $ 7,880 $ 8,169 $ 8,356 Fair value of shares vested $ 15,372 $ 11,043 $ 13,186 Proceeds to the Company from the exercise of stock-based compensation $ 695 $ 6,610 $ 7,976 Tax benefit from exercise of stock-based compensation, including shortfall tax benefits $ — $ — $ (251 )
Schedule of unvested restricted stock unit activity	following table summarizes the Company’s unvested restricted stock unit activity for the year ended December 31, 2018 : Shares Weighted- Aggregate Unvested Restricted Stock Units (RSUs) Outstanding at January 1, 2018 696 $ 35.34 $ 39,609 Awarded 189 54.99 Vested (263 ) 35.23 Forfeited (18 ) 39.23 Outstanding at December 31, 2018 604 $ 41.37 $ 32,669 Outstanding and expected to vest at December 31, 2018 598 $ 41.32 $ 32,388 * The intrinsic value for outstanding and expected to vest is calculated using the closing price per share of $54.13 , as reported by the New York Stock Exchange on December 31, 2018

Trade Accounts Receivable, net

Trade Accounts Receivable, net (Tables)	12 Months Ended
	Dec. 31, 2018
Receivables [Abstract]
Schedule of trade accounts receivable, net	Trade accounts receivable consisted of the following: December 31, (in thousands) 2018 2017 Trade accounts receivable $ 149,886 $ 139,910 Allowance for doubtful accounts (1,364 ) (996 ) Allowance for sales discounts (2,470 ) (2,956 ) $ 146,052 $ 135,958

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2018
Inventory Disclosure [Abstract]
Schedule of components of inventories	The components of inventories consisted of the following: December 31, (in thousands) 2018 2017 Raw materials $ 98,058 $ 91,022 In-process products 24,645 26,849 Finished products 153,385 135,125 $ 276,088 $ 252,996

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, plant and equipment consisted of the following: December 31, (in thousands) 2018 2017 Land $ 30,034 $ 33,087 Buildings and site improvements 198,809 212,817 Leasehold improvements 4,826 4,684 Machinery and equipment 330,076 300,334 563,745 550,922 Less accumulated depreciation and amortization (318,388 ) (299,907 ) 245,357 251,015 Capital projects in progress 9,240 22,005 $ 254,597 $ 273,020

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets, Net (Tables)	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of changes in the carrying amount of goodwill, by segment	The annual changes in the carrying amount of goodwill, by segment, as of December 31, 2017 and 2018 , were as follows, respectively: (in thousands) North Europe Asia Total Balance as of January 1, 2017 Goodwill $ 96,154 $ 51,031 $ 1,375 $ 148,560 Accumulated impairment losses (10,666 ) (13,415 ) — (24,081 ) 85,488 37,616 1,375 124,479 Goodwill acquired 10,066 — — 10,066 Foreign exchange 198 2,472 114 2,784 Reclassifications (1) 3 (192 ) — (189 ) Balance as of December 31, 2017 0 Goodwill 106,421 53,311 1,489 161,221 Accumulated impairment losses (10,666 ) (13,415 ) — (24,081 ) 95,755 39,896 1,489 137,140 Goodwill acquired 913 — — 913 Foreign exchange (233 ) (738 ) (145 ) (1,116 ) Balance as of December 31, 2018 0 Goodwill 107,101 52,573 1,344 161,018 Accumulated impairment losses (10,666 ) (20,102 ) — (30,768 ) $ 96,435 $ 32,471 $ 1,344 $ 130,250 (1) During 2017, $3 thousand and $192 thousand was reclassified to other assets, with a corresponding $189 thousand decrease in goodwill related to the CG Visions and MS Decoupe acquisitions.
Schedule of changes in the carrying amounts of finite-lived intangible assets subject to amortization	The annual changes in the carrying amounts of patents, unpatented technologies, customer relationships and non-compete agreements and other intangible assets subject to amortization for the years ended December 31, 2018 and 2017 were as follows: (in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Patents Balance at January 1, 2017 $ 1,718 $ (528 ) $ 1,190 Acquisition 800 — $ 800 Amortization — (187 ) (187 ) Foreign exchange 2 — 2 Removal of fully amortized assets (170 ) 170 — Balance at December 31, 2017 2,350 (545 ) 1,805 Amortization — (107 ) (107 ) Removal of fully amortized assets (241 ) 241 — Balance at December 31, 2018 $ 2,109 $ (411 ) $ 1,698 (in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Unpatented Technology Balance at January 1, 2017 $ 21,162 $ (9,003 ) $ 12,159 Amortization — (1,976 ) (1,976 ) Foreign exchange 505 — 505 Balance at December 31, 2017 21,667 (10,979 ) 10,688 Amortization — (2,557 ) (2,557 ) Reclassifications (1) 277 — 277 Foreign exchange (90 ) $ — (90 ) Removal of fully amortized assets (1,192 ) 1,192 — Balance at December 31, 2018 $ 20,662 $ (12,344 ) $ 8,318 (1) Reclassifications in 2018 of $0.3 million in unpatented technology, with a corresponding reduction in other assets related to Technogrout asset acquisition. (in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Non-Compete Agreements, Trademarks and Other Balance at January 1, 2017 $ 6,727 (4,100 ) 2,627 Acquisition 9,260 — 9,260 Amortization — (2,495 ) (2,495 ) Foreign exchange 16 — 16 Removal of fully amortized assets (3,778 ) 3,778 — Balance at December 31, 2017 12,225 (2,817 ) 9,408 Acquisition 879 — 879 Amortization — (1,757 ) (1,757 ) Reclassifications (24 ) — (24 ) Removal of fully amortized asset (855 ) 855 — Balance at December 31, 2018 $ 12,225 $ (3,719 ) $ 8,506 (in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer Relationships Balance at January 1, 2017 $ 21,217 (14,945 ) 6,272 Acquisition 1,091 — 1,091 Amortization — (1,574 ) (1,574 ) Reclassifications (1) 626 — 626 Foreign exchange 394 — 394 Removal of fully amortized assets (5,650 ) 5,650 — Balance at December 31, 2017 17,678 (10,869 ) 6,809 Amortization — (1,430 ) (1,430 ) Foreign exchange (115 ) — (115 ) Balance at December 31, 2018 $ 17,563 $ (12,299 ) $ 5,264 (1) During 2017, $0.6 million was reclassified to customer relationships with a corresponding $0.6 million decrease in other assets related to the MS Decoupe acquisition.
Schedule of estimated future amortization of intangible assets	At December 31, 2018 , estimated future amortization of intangible assets was as follows: (in thousands) 2019 $ 5,319 2020 5,287 2021 4,807 2022 2,928 2023 2,124 Thereafter 3,321 $ 23,786
Schedule of finite-lived intangible assets	Definite-lived and indefinite-lived assets, net, by segment as of December 31, 2018 and 2017 were as follows: December 31, 2017 Gross Accumulated Net (in thousands) Total Intangible Assets North America $ 30,775 $ (13,732 ) $ 17,043 Europe 23,762 (11,479 ) 12,283 Total $ 54,537 $ (25,211 ) $ 29,326 At December 31, 2018 Gross Accumulated Net (in thousands) Total Intangible Assets North America $ 30,825 $ (16,002 ) $ 14,823 Europe 22,353 (12,774 ) 9,579 Total $ 53,178 $ (28,776 ) $ 24,402

Accrued Liabilities (Tables)

Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2018
Payables and Accruals [Abstract]
Schedule of accrued liabilities	Accrued liabilities consisted of the following: December 31, (in thousands) 2018 2017 Sales incentive and advertising accruals $ 36,312 $ 31,143 Vacation liability 2,901 8,993 Dividend payable 10,024 9,954 Labor related liabilities 22,365 20,196 Sales taxes payable and other 26,970 18,199 $ 98,572 $ 88,485

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Schedule of Interest Expense	The Company incurs interest costs, which include interest, maintenance fees and bank charges. The amount of costs incurred, capitalized, and expensed for the years ended December 31, 2018 , 2017 and 2016 , consisted of the following: Years Ended December 31, 2018 2017 2016 Interest costs incurred $ 1,224 $ 1,249 $ 1,167 Less: Interest capitalized (160 ) (72 ) (20 ) Interest expense $ 1,064 $ 1,177 $ 1,147

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of minimum rental commitments under all non-cancelable leases	At December 31, 2018 , minimum rental commitments under all non-cancelable leases were as follows: (in thousands) 2019 $ 6,962 2020 5,830 2021 4,481 2022 3,457 2023 2,399 Thereafter 8,563 Total $ 31,692
Schedule of Contractual Obligations	At December 31, 2018 , other contractual obligations were as follows: (in thousands) As of December 31, 2018 Debt and Interest Obligations Capital Lease Obligations Purchase Obligations Total 2019 $ 1,234 $ 1,160 $ 28,438 $ 30,832 2020 450 1,160 2,367 3,977 2021 250 484 1,507 2,241 2022 — — 583 583 2023 — — — — Thereafter — — — — Total $ 1,934 $ 2,804 $ 32,895 $ 37,633

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of provision for income taxes from operations	The provision for income taxes from operations consisted of the following: Years Ended December 31, (in thousands) 2018 2017 2016 Current Federal $ 27,410 $ 36,077 $ 39,649 State 9,515 6,357 7,053 Foreign 4,605 3,068 3,333 Deferred Federal 3,179 6,093 260 State 263 544 13 Foreign 523 (338 ) (1,142 ) $ 45,495 $ 51,801 $ 49,166
Schedule of income and loss from operations before income taxes	Income and loss from operations before income taxes for the years ended December 31, 2018 , 2017 , and 2016 , respectively, consisted of the following: Years Ended December 31, (in thousands) 2018 2017 2016 Domestic $ 169,109 $ 132,105 $ 131,827 Foreign 3,019 12,313 7,073 $ 172,128 $ 144,418 $ 138,900
Schedule of effective income tax rates reconciliations	Reconciliations between the statutory federal income tax rates and the Company’s effective income tax rates as a percentage of income before income taxes for its operations were as follows: Years Ended December 31, (in thousands) 2018 2017 2016 Federal tax rate 21.0 % 35.0 % 35.0 % State taxes, net of federal benefit 4.5 % 3.2 % 3.4 % Tax benefit of domestic manufacturing deduction — % (2.0 )% (2.5 )% Mandatory deemed repatriation of foreign earnings — % 2.7 % — % Change in U.S. tax rate applied to deferred taxes — % (1.9 )% — % Change in valuation allowance 1.3 % 1.3 % (0.1 )% True-up of prior year tax returns to tax provision (1.2 )% (0.5 )% (0.2 )% Difference between United States statutory and foreign local tax rates 0.5 % (0.8 )% (0.3 )% Change in uncertain tax position (0.1 )% — % (0.2 )% Other 0.4 % (1.1 )% 0.3 % Effective income tax rate 26.4 % 35.9 % 35.4 %
Schedule of deferred tax assets and liabilities	The tax effects of the significant temporary differences that constitute the deferred tax assets and liabilities at December 31, 2018 and 2017 , respectively, were as follows: December 31, (in thousands) 2018 2017 Deferred asset taxes State tax $ 919 $ 1,390 Workers’ compensation 785 822 Health claims 445 487 Vacation liability 370 1,008 Allowance for doubtful accounts 171 104 Inventories 5,659 5,385 Sales incentive and advertising allowances 799 709 Stock-based compensation 3,074 2,967 Unrealized foreign exchange gain or loss 440 291 Foreign tax credit carryforwards 5,043 4,453 Uncertain tax positions’ unrecognized tax benefits 39 31 Foreign tax loss carry forward 8,091 6,892 Other 1,813 1,291 $ 27,648 $ 25,830 Less valuation allowances (13,254 ) (11,114 ) Total deferred asset taxes $ 14,394 $ 14,716 Deferred tax liabilities Depreciation $ (9,189 ) $ (7,050 ) Goodwill and other intangibles amortization (13,027 ) (11,331 ) Tax effect on cumulative translation adjustment (497 ) (487 ) Total deferred tax liabilities (22,713 ) (18,868 ) Total Deferred tax asset/(liability) $ (8,319 ) $ (4,152 )
Schedule of reconciliation of unrecognized tax benefits, including foreign translation amount	A reconciliation of the beginning and ending amounts of unrecognized tax benefits in 2018 , 2017 and 2016 , respectively, was as follows, including foreign translation amounts: Reconciliation of Unrecognized Tax Benefits 2018 2017 2016 Balance at January 1 $ 1,895 $ 1,119 $ 1,107 Additions based on tax positions related to prior years — 660 204 Reductions based on tax positions related to prior years (171 ) (1 ) — Additions for tax positions of the current year 100 319 155 Lapse of statute of limitations (67 ) (202 ) (347 ) Balance at December 31 $ 1,757 $ 1,895 $ 1,119

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Schedule of performance of reportable segments	The following table shows certain measurements used by management to assess the performance of the segments described above as of December 31, 2018 , 2017 and 2016 , respectively: (in thousands) North Europe Asia/ Administrative Total 2018 Net sales $ 910,587 $ 159,027 $ 9,195 $ — $ 1,078,809 Sales to other segments * 2,279 1,773 28,292 — 32,344 Income from operations 164,453 (3,026 ) 2,040 8,865 172,332 Depreciation and amortization 30,505 6,297 1,794 797 39,393 Impairment of goodwill — 6,686 — — 6,686 Significant non-cash charges 6,340 1,169 48 3,619 11,176 Provision for income taxes 39,638 2,947 113 2,797 45,495 Capital expenditures and business acquisitions, net of cash acquired 27,059 2,556 1,702 — 31,317 Total assets 1,119,012 157,437 25,644 (280,430 ) 1,021,663 (in thousands) North America Europe Asia/ Pacific Administrative & All Other Total 2017 Net sales $ 803,697 $ 165,155 $ 8,173 $ — $ 977,025 Sales to other segments * 3,237 959 20,715 — 24,911 Income (loss) from operations 132,995 2,723 1,296 901 137,915 Depreciation and amortization 25,745 5,832 1,246 901 33,724 Gain on bargain purchase of a business — 6,336 — — 6,336 Significant non-cash charges 9,861 1,509 65 2,473 13,908 Provision for income taxes 47,434 2,124 419 1,824 51,801 Capital expenditures and business acquisitions, net of 70,040 11,411 4,511 — 85,962 Total assets 953,033 208,640 26,820 (150,970 ) 1,037,523 (in thousands) North America Europe Asia/ Pacific Administrative & All Other Total 2016 Net sales $ 742,021 $ 111,274 $ 7,366 $ — $ 860,661 Sales to other segments * 2,512 570 28,690 — 31,772 Income (loss) from operations 137,466 2,115 1,807 (178 ) 141,210 Depreciation and amortization 19,433 5,809 1,208 1,477 27,927 Significant non-cash charges 9,124 1,052 113 3,657 13,946 Provision for (benefit from) income taxes 45,547 1,428 721 1,470 49,166 Capital expenditures and business acquisitions, net of 37,652 8,461 1,250 — 47,363 Total assets 853,826 165,121 25,118 (64,091 ) 979,974
Schedule of net sales and long-lived assets by geographical segments	The following table shows the geographic distribution of the Company’s net sales and long-lived assets as of December 31, 2018 , 2017 and 2016 , respectively: 2018 2017 2016 (in thousands) Net Long-Lived Net Long-Lived Net Long-Lived United States $ 860,482 $ 210,063 $ 758,181 $ 223,184 $ 702,071 $ 192,787 Canada 46,874 4,257 43,176 4,650 38,269 4,473 United Kingdom 27,194 1,417 23,157 1,459 20,751 1,183 Germany 22,950 13,221 21,821 14,153 33,062 12,582 France 40,182 7,891 36,677 9,152 20,905 8,349 Poland 10,200 2,794 20,409 2,471 6,633 1,830 Sweden 15,461 1,154 16,421 1,068 — — Denmark 11,682 1,454 14,723 1,601 15,728 1,249 Norway 12,324 — 12,902 229 — — Switzerland 6,939 8,067 5,593 8,748 6,549 8,469 Australia 6,119 199 5,501 268 4,741 239 Belgium 5,547 1,961 5,050 2,065 1,286 1,798 The Netherlands 5,068 81 4,834 110 4,909 21 New Zealand 3,061 111 2,604 130 2,474 163 Chile 3,233 41 2,314 61 1,572 56 Other countries 1,493 11,635 3,662 12,710 1,711 7,471 $ 1,078,809 $ 264,346 $ 977,025 $ 282,059 $ 860,661 $ 240,670
Schedule of distribution of the Company's net sales by product group	The following table show the distribution of the Company’s net sales by product for the years ended December 31, 2018 , 2017 and 2016 , respectively: (in thousands) 2018 2017 2016 Wood Construction $ 913,202 $ 833,200 $ 732,414 Concrete Construction 165,317 143,102 128,247 Other 290 723 — Total $ 1,078,809 $ 977,025 $ 860,661

Selected Quarterly Financial _2

Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Schedule of selected quarterly financial data	The following table sets forth selected quarterly financial data for each of the quarters in 2018 and 2017 , respectively: (in thousands, except per share amounts) 2018 2017 Fourth Third Second First Fourth Third Second First Net sales $ 241,845 $ 284,178 $ 308,007 $ 244,779 $ 231,681 $ 262,476 $ 263,002 $ 219,867 Cost of sales 143,409 150,282 167,442 137,157 129,777 143,338 140,139 120,390 Gross profit 98,436 133,896 140,565 107,622 101,904 119,138 122,863 99,477 Research and development and other engineering 10,216 10,441 11,249 11,150 12,565 11,265 11,967 11,819 Selling 26,278 26,879 29,201 27,573 28,753 27,867 28,646 29,637 General and administrative 45,195 37,356 39,354 37,188 36,236 33,441 37,586 35,845 Total operating expenses 81,689 74,676 79,804 75,911 77,554 72,573 78,199 77,301 Net gain on disposal of assets (8,810 ) (460 ) (125 ) (1,184 ) (13 ) (147 ) 50 (50 ) Impairment of goodwill 6,686 — — — — — — — Income from operations 18,871 59,680 60,886 32,895 24,363 46,712 44,614 22,226 Loss in equity investment, before tax (11 ) (30 ) 2 (24 ) (33 ) (13 ) (12 ) (28 ) Foreign exchange gain (loss) (571 ) 1,242 (142 ) (99 ) 342 (16 ) 523 403 Interest (expense) income, net (239 ) (58 ) (184 ) (90 ) (104 ) (296 ) (199 ) (189 ) Gain (adjustment) on bargain purchase of a business — — — — — (2,052 ) — 8,388 Gain (loss) on disposal of a business — — — — (654 ) 443 — — Income before income taxes 18,050 60,834 60,562 32,682 23,914 44,778 44,926 30,800 Provision for income taxes 5,293 16,473 16,476 7,253 10,829 16,581 16,712 7,679 Net income $ 12,757 $ 44,361 $ 44,086 $ 25,429 $ 13,085 $ 28,197 $ 28,214 $ 23,121 Earnings per share of common stock: 0 Basic $ 0.28 $ 0.96 $ 0.95 $ 0.55 $ 0.28 $ 0.60 $ 0.59 $ 0.49 Diluted 0.28 0.95 0.94 0.54 0.27 0.59 0.59 0.48 Cash dividends declared per share of common stock $ 0.22 $ 0.22 $ 0.22 $ 0.21 $ — $ 0.42 $ 0.21 $ 0.18

Operations and Summary of Sig_3

Operations and Summary of Significant Accounting Policies - PP&E and Other Misc Disclosures (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)vote / sharesseriesbank	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
High end of the range of the required percentage voting interest held to account for investments with the equity method of accounting	50.00%
Allowance for Doubtful Accounts
Percentage reserved for accounts receivable due from customers in deteriorating financial condition	100.00%
Number of banks where demand deposit or money market accounts are held by the company | bank	17
Fair Value of Financial Instruments
United States Treasury securities and money market funds included in cash equivalents	$ 200	$ 5,300
Contingent Consideration for acquisition	$ 0	$ 1,314	$ 0
Depreciation and Amortization
Number of series by which the Board may issue authorized and unissued preferred stock, minimum | series	1
Voting rights per common share | vote / shares	1
Minimum | Buildings and site improvements
Depreciation and Amortization
Estimated useful life	15 years
Maximum | Buildings and site improvements
Depreciation and Amortization
Estimated useful life	45 years

Operations and Summary of Sig_4

Operations and Summary of Significant Accounting Policies - Research and Development and Advertisting Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Product and Software Research and Development Costs
Product Research and Development Costs	$ 10.8	$ 10.6	$ 10.8
Selling Costs
Advertising expenses	$ 7.6	$ 9.6	$ 7.1

Operations and Summary of Sig_5

Operations and Summary of Significant Accounting Policies - Stock Based Compensation (Details)	12 Months Ended
	Dec. 31, 2018
Accounting for Stock-Based Compensation
Requisite service period for options to vest	4 years
Vesting period	3 years

Operations and Summary of Sig_6

Operations and Summary of Significant Accounting Policies Recently Adopted Accounting Standards (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncement, Early Adoption [Line Items]
Retained earnings		$ 628,207	$ 676,644
Accounting Standards Update 2018-02 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Retained earnings		$ 400
Accounting Standards Update 2016-02 [Member] | Subsequent Event | Minimum
New Accounting Pronouncement, Early Adoption [Line Items]
Operating Lease, Right-of-Use Asset	$ 36,000
Operating Lease, Liability	35,000
Accounting Standards Update 2016-02 [Member] | Subsequent Event | Maximum
New Accounting Pronouncement, Early Adoption [Line Items]
Operating Lease, Right-of-Use Asset	37,000
Operating Lease, Liability	$ 36,000

Revenue from Contract with Cu_2

Revenue from Contract with Customer (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Retained earnings	$ 628,207		$ 676,644
ASC 606
Disaggregation of Revenue [Line Items]
Retained earnings		$ 800
ASC 606 | Wood construction products
Disaggregation of Revenue [Line Items]
Percentage of net sales	85.00%
ASC 606 | Concrete construction products
Disaggregation of Revenue [Line Items]
Percentage of net sales	15.00%
ASC 606 | Other
Disaggregation of Revenue [Line Items]
Percentage of net sales	1.00%

Net Income per Share - Shares a

Net Income per Share - Shares and EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of basic earnings per share ("EPS") to diluted EPS
Net income									$ 126,633	$ 92,617	$ 89,734
Basic weighted-average shares outstanding									46,213	47,486	48,084
Dilutive effect of potential common stock equivalents - stock options (in shares)									327	288	211
Diluted weighted-average shares outstanding									46,540	47,774	48,295
Net earnings per share:
Basic	$ 0.28	$ 0.96	$ 0.95	$ 0.55	$ 0.28	$ 0.60	$ 0.59	$ 0.49	$ 2.74	$ 1.95	$ 1.87
Diluted	$ 0.28	$ 0.95	$ 0.94	$ 0.54	$ 0.27	$ 0.59	$ 0.59	$ 0.48	$ 2.72	$ 1.94	$ 1.86

Shareholders' equity - Stock Re

Shareholders' equity - Stock Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended	12 Months Ended
	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2018	Dec. 01, 2018	Dec. 01, 2017	Aug. 31, 2017	Aug. 31, 2016	Feb. 29, 2016
2016 Stock Repurchase Program
Accelerated Share Repurchases [Line Items]
Common stock repurchase, authorized amount							$ 125	$ 125	$ 50
June 2017 ASR Program [Member]
Accelerated Share Repurchases [Line Items]
Common stock repurchase, authorized amount		$ 20	$ 60	$ 60
Repurchase of common stock (in shares)		460,887		1,138,387
Stock repurchase, average cost per share (in USD per share)		$ 43.39
December 2017 ASR Program [Member]
Accelerated Share Repurchases [Line Items]
Common stock repurchase, authorized amount			$ 234.6	$ 234.6		$ 50
Repurchase of common stock (in shares)	677,500		182,171
Settlement of accelerated share repurchase program						$ 40
Stock repurchase, average cost per share (in USD per share)	$ 59.04
2017 Stock Repurchase Program
Accelerated Share Repurchases [Line Items]
Common stock repurchase, authorized amount							$ 275
Repurchase of common stock (in shares)				1,772,658
Stock repurchase, average cost per share (in USD per share)			$ 62.69
2018 Stock Repurchase Program [Member] [Member]
Accelerated Share Repurchases [Line Items]
Common stock repurchase, authorized amount					$ 100

Shareholders' equity - Comprehe

Shareholders' equity - Comprehensive Income (Loss) - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	$ (12,496)	$ (32,970)	$ (28,576)
Other Comprehensive Income (Loss), Net of Tax	(12,154)	20,329	(4,394)
Amounts reclassified from accumulative other comprehensive income, net of tax		145
Balance, end of period	(24,650)	(12,496)	(32,970)	$ (28,576)
Reclassification from AOCI, tax expense (benefit)		0	0
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(10,054)	(31,472)	(27,552)
Other Comprehensive Income (Loss), Net of Tax	(12,911)	21,273	(3,920)
Amounts reclassified from accumulative other comprehensive income, net of tax		145
Balance, end of period	(22,965)	(10,054)	(31,472)	(27,552)
Other comprehensive income (loss) before reclassification, tax expense (benefit)	0	0	222
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(2,442)	(1,498)
Other Comprehensive Income (Loss), Net of Tax	757	(944)	(474)	$ (1,024)
Amounts reclassified from accumulative other comprehensive income, net of tax		0
Balance, end of period	(1,685)	(2,442)	(1,498)
Other comprehensive income (loss) before reclassification, tax expense (benefit)	$ (59)	$ (37)	$ (87)

Stock-Based Compensation Plan_2

Stock-Based Compensation Plans (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)director$ / sharesshares	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2016USD ($)shares
Unrecognized compensation cost and vesting period
Unrecognized compensation costs related to unvested stock-based compensation arrangements | $	$ 10,300
Weighted-average period for recognition of unrecognized stock-based compensation expense	2 years 1 month 6 days
Other disclosures
Stock-based compensation expense recognized in operating expenses | $	$ 10,356	$ 12,744	$ 13,113
Requisite service period for options to vest	4 years
Tax benefit of stock-based compensation expense in provision for income taxes | $	$ 2,476	4,575	4,757
Allocated Share-based Compensation Expense, Net of Tax | $	7,880	8,169	8,356
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $	15,372	11,043	13,186
Issuance of Company’s common stock | $	695	6,610	7,976
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options | $	$ 0	$ 0	$ 251
Stock Bonus Plan
Other disclosures
Shares issued and committed to issue | shares	9,000	12,000	10,000
Stock-based compensation expense recognized in operating expenses | $	$ 800	$ 1,200	$ 800
Restricted Stock Units
Restricted stock unit activity
Outstanding at the beginning of the period (in shares) | shares	696,000
Awarded (in shares) | shares	189,167
Vested (in shares) | shares	(263,000)
Forfeited (in shares) | shares	(18,000)
Outstanding at the end of the period (in shares) | shares	604,000	696,000
Outstanding and expected to vest at the end of the period (in shares) | shares	598,000
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 35.34
Awarded (in dollars per share)	54.99
Vested (in dollars per share)	35.23
Forfeited (in dollars per share)	39.23
Outstanding at the end of the period (in dollars per share)	41.37	$ 35.34
Outstanding and expected to vest at the end of the period (in dollars per share)	$ 41.32
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars) | $	$ 32,669	$ 39,609
Outstanding and expected to vest at end of the period (in dollars) | $	$ 32,388
Closing price per share (in dollars per share)	$ 54.13
Total intrinsic value of awards vested (in dollars) | $	$ 9,800	$ 10,800	10,300
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 35.34
Forfeited (in dollars per share)	39.23
Outstanding at the end of the period (in dollars per share)	$ 41.37	$ 35.34
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars) | $	$ 32,669	$ 39,609
Non-Qualified Stock Options
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 29.66
Forfeited (in dollars per share)	29.66
Outstanding at the end of the period (in dollars per share)	$ 0	$ 29.66
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars) | $	$ 0	$ 780
Non-Qualified Stock Options activity
Outstanding at the beginning of the period (in shares) | shares	28,000
Exercised (in shares) | shares	(23,000)
Forfeited (in shares) | shares	(5,000)
Outstanding at the end of the period (in shares) | shares	0	28,000
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 29.66
Exercised (in dollars per share)	29.66
Forfeited (in dollars per share)	29.66
Outstanding at the end of the period (in dollars per share)	$ 0	$ 29.66
Weighted-Average Remaining Contractual Life
Outstanding at the end of the period		3 days
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars) | $	$ 0	$ 780
Total intrinsic value of stock options exercised (in dollars) | $	$ 700	$ 4,600	$ 3,100
Non-Qualified Stock Options | 2011 Plan
Stock-Based Compensation
Maximum common stock shares that may be issued under plan | shares	16,300,000
Independent directors | Restricted Stock Units
Aggregate Intrinsic Value
Number Of Directors | director	8
Foreign employees
Other disclosures
Shares issued and committed to issue | shares	5,500
Shares expected to be settled In cash | shares	3,500

Trade Accounts Receivable, ne_2

Trade Accounts Receivable, net (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Trade accounts receivable	$ 149,886	$ 139,910
Allowance for doubtful accounts	(1,364)	(996)
Allowance for sales discounts	(2,470)	(2,956)
Trade accounts receivable, net	146,052	$ 135,958
Contract with Customer, Refund Liability	$ 800

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 98,058	$ 91,022
In-process products	24,645	26,849
Finished products	153,385	135,125
Total inventories	$ 276,088	$ 252,996

Property, Plant and Equipment_2

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Nov. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		$ 563,745	$ 550,922
Less accumulated depreciation and amortization		318,388	299,907
Property Plant and Equipment Excluding Capital Projects in Progress		245,357	251,015
Capital projects in progress		9,240	22,005
Property, plant and equipment, net		254,597	273,020
Fully Depreciated Property, Plant and Equipment, Original Cost		196,800	189,900
Proceeds from Sale of Property Held-for-sale	$ 17,500
Depreciation		33,300	27,300	$ 21,600
Software Development [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		39,100	20,500
Capital projects in progress		3,600	12,200
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		30,034	33,087
Buildings and site improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		198,809	212,817
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		4,826	4,684
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		$ 330,076	$ 300,334

Goodwill- Goodwill and Intangib

Goodwill- Goodwill and Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Carrying amount of goodwill by reportable segment
Amortization of Intangible Assets									$ (6,200)	$ (6,000)	$ (6,100)
Goodwill [Roll Forward]
Goodwill, Gross	$ 161,018				$ 161,221				161,018	161,221	148,560
Accumulated impairment losses	(30,768)				(24,081)				(30,768)	(24,081)	(24,081)
Goodwill	130,250				137,140				130,250	137,140	124,479
Goodwill acquired									913	10,066
Foreign exchange									(1,116)	2,784
Impairment of goodwill	6,686	$ 0	$ 0	$ 0	0	$ 0	$ 0	$ 0	6,686	0	0
Goodwill, Other Increase (Decrease)									(189)	(189)
North America
Goodwill [Roll Forward]
Goodwill, Gross	107,101				106,421				107,101	106,421	96,154
Accumulated impairment losses	(10,666)				(10,666)				(10,666)	(10,666)	(10,666)
Goodwill	96,435				95,755				96,435	95,755	85,488
Goodwill acquired									913	10,066
Foreign exchange									(233)	198
Impairment of goodwill									0
Goodwill, Other Increase (Decrease)									300	3
Europe
Goodwill [Roll Forward]
Goodwill, Gross	52,573				53,311				52,573	53,311	51,031
Accumulated impairment losses	(20,102)				(13,415)				(20,102)	(13,415)	(13,415)
Goodwill	32,471				39,896				32,471	39,896	37,616
Goodwill acquired									0	0
Foreign exchange									(738)	2,472
Impairment of goodwill									6,686
Goodwill, Other Increase (Decrease)									(192)	(192)
Asia/Pacific
Goodwill [Roll Forward]
Goodwill, Gross	1,344				1,489				1,344	1,489	1,375
Accumulated impairment losses	0				0				0	0	0
Goodwill	$ 1,344				$ 1,489				1,344	1,489	$ 1,375
Goodwill acquired									0	0
Foreign exchange									(145)	114
Impairment of goodwill									0
Goodwill, Other Increase (Decrease)										0
Patents
Carrying amount of goodwill by reportable segment
Amortization of Intangible Assets									(107)	(187)
Noncompete Agreements Trademarks and Other
Carrying amount of goodwill by reportable segment
Amortization of Intangible Assets									(1,757)	(2,495)
Reclassifications									24
Customer Relationships
Carrying amount of goodwill by reportable segment
Amortization of Intangible Assets									$ (1,430)	(1,574)
Reclassifications										$ 626

Amortizable Intangible Assets -

Amortizable Intangible Assets - Goodwill and Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amortizable Intangible assets
Gross Carrying Amount	$ 53,178				$ 54,537				$ 53,178	$ 54,537
Accumulated Amortization	(28,776)				(25,211)				(28,776)	(25,211)
Amortization of Intangible Assets									(6,200)	(6,000)	$ (6,100)
Intangible assets, net	24,402				29,326				24,402	29,326
Finite-lived Intangible Assets Acquired									879	800
Goodwill, Other Increase (Decrease)									(189)	(189)
Impairment of goodwill	6,686	$ 0	$ 0	$ 0	0	$ 0	$ 0	$ 0	6,686	0	0
Foreign exchange										16
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Net									0	0
2,019	5,319								5,319
2,020	5,287								5,287
2,021	4,807								4,807
2,022	2,928								2,928
2,023	2,124								2,124
Thereafter	3,321								3,321
Finite-Lived Intangible Assets, Net	23,786								23,786
Increase (Decrease) in Other Current Assets									5,297	(2,016)	(2,180)
Patents
Amortizable Intangible assets
Gross Carrying Amount	2,109				2,350				2,109	2,350	1,718
Accumulated Amortization	(411)				(545)				(411)	(545)	(528)
Amortization of Intangible Assets									(107)	(187)
Intangible assets, net	1,698				1,805				1,698	1,805	1,190
Foreign exchange										2
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Gross									241	170
Accumulated amortization of removal of fully amortized asset									241	170
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Net										0
Unpatented Technology
Amortizable Intangible assets
Gross Carrying Amount	20,662				21,667				20,662	21,667	21,162
Accumulated Amortization	(12,344)				(10,979)				(12,344)	(10,979)	(9,003)
Amortization of Intangible Assets									(2,557)	(1,976)
Intangible assets, net	8,318				10,688				8,318	10,688	12,159
Reclassifications									(277)
Foreign exchange									(90)	505
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Gross									1,192
Accumulated amortization of removal of fully amortized asset									1,192
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Net									0
Noncompete Agreements Trademarks and Other
Amortizable Intangible assets
Gross Carrying Amount	12,225				12,225				12,225	12,225	6,727
Accumulated Amortization	(3,719)				(2,817)				(3,719)	(2,817)	(4,100)
Amortization of Intangible Assets									(1,757)	(2,495)
Intangible assets, net	8,506				9,408				8,506	9,408	2,627
Finite-lived Intangible Assets Acquired									879	9,260
Reclassifications									24
Foreign exchange										16
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Gross									(855)	(3,778)
Accumulated amortization of removal of fully amortized asset									855	3,778
Customer Relationships
Amortizable Intangible assets
Gross Carrying Amount	17,563				17,678				17,563	17,678	21,217
Accumulated Amortization	(12,299)				(10,869)				(12,299)	(10,869)	(14,945)
Amortization of Intangible Assets									(1,430)	(1,574)
Intangible assets, net	5,264				6,809				5,264	6,809	$ 6,272
Finite-lived Intangible Assets Acquired										1,091
Reclassifications										626
Foreign exchange									(115)	394
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Gross										(5,650)
Accumulated amortization of removal of fully amortized asset										5,650
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Net										0
North America
Amortizable Intangible assets
Gross Carrying Amount	30,825				30,775				30,825	30,775
Accumulated Amortization	(16,002)				(13,732)				(16,002)	(13,732)
Intangible assets, net	$ 14,823				$ 17,043				14,823	17,043
Goodwill, Other Increase (Decrease)									300	3
Impairment of goodwill									0
Europe | Customer Relationships
Amortizable Intangible assets
Reclassifications										$ (600)
Increase (Decrease) in Other Current Assets									$ 600
Maximum
Amortizable Intangible assets
Finite-Lived Intangible Asset, Useful Life									21 years
Minimum
Amortizable Intangible assets
Finite-Lived Intangible Asset, Useful Life									3 years

Indefinite-Lived Intangible Ass

Indefinite-Lived Intangible Assets- Goodwill and Intangible Assets, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Indefinite-Lived Intangible Assets
Gross Carrying Amount	$ 53,178	$ 54,537
Accumulated Amortization	(28,776)	(25,211)
Intangible assets, net	24,402	29,326
Trade Name
Indefinite-Lived Intangible Assets
Intangible assets, net	600
North America
Indefinite-Lived Intangible Assets
Gross Carrying Amount	30,825	30,775
Accumulated Amortization	(16,002)	(13,732)
Intangible assets, net	14,823	17,043
Europe
Indefinite-Lived Intangible Assets
Gross Carrying Amount	22,353	23,762
Accumulated Amortization	(12,774)	(11,479)
Intangible assets, net	$ 9,579	$ 12,283

Acquisitions and Dispositions (

Acquisitions and Dispositions (Details) - USD ($) $ in Thousands	1 Months Ended				3 Months Ended								9 Months Ended	12 Months Ended
	Oct. 31, 2017	Sep. 30, 2017	Jan. 31, 2017	Aug. 31, 2016	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Acquisitions
Gain on bargain purchase of a business														$ 0	$ (6,336)	$ 0
Goodwill					$ 130,250				$ 137,140					130,250	137,140	124,479
Goodwill acquired														913	10,066
Finite-lived Intangible Assets Acquired														879	800
Proceeds from Sales of Business, Affiliate and Productive Assets		$ 10,200
Loss on disposal of a business	$ (200)				0	$ 0	$ 0	$ 0	(654)	$ 443	$ 0	$ 0		0	(211)	0
North America
Acquisitions
Gain on bargain purchase of a business															0
Goodwill					96,435				95,755					96,435	95,755	85,488
Goodwill acquired														913	10,066
Europe
Acquisitions
Gain on bargain purchase of a business															(6,336)
Goodwill					$ 32,471				$ 39,896					32,471	39,896	$ 37,616
Goodwill acquired														$ 0	$ 0
CG Visions, Inc. [Member] | North America
Acquisitions
Cash paid for acquisition			$ 20,800
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other			500
Goodwill			10,100
Intangible assets			$ 10,300
Weighted-average amortization period			7 years
Noncurrent Assets			$ 20,400
Business Combination, Contingent Consideration, Liability			1,100
Gbo Fastening Systems AB [Member] | Europe Segment [Domain]
Acquisitions
Cash paid for acquisition			10,200
Gain on bargain purchase of a business			(6,300)										$ (6,336)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents			3,956
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other			760
Noncurrent Assets			3,929
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other			6,146
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables			4,914
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory			13,591
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets			27,150
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable			4,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities			10,646
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net			16,504
Business Combination, Consideration Transferred			$ 10,168
MS Decoupe [Member] | Europe Segment [Domain]
Acquisitions
Cash paid for acquisition				$ 6,900
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other				1,600
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets				5,000
Intangible assets				$ 1,700
Weighted-average amortization period				10 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other				$ 600
MS Decoupe [Member] | North America
Acquisitions
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents				1,400
Goodwill				1,400
MS Decoupe [Member] | Europe
Acquisitions
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent				$ 1,000

Equity Investments (Details)

Equity Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 23, 2016
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage			25.00%
Equity investment (see Note 11)	$ 2,487	$ 2,549	$ 2,500

Accrued Liabilities (Details)

Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Sales incentive and advertising accruals	$ 36,312	$ 31,143
Vacation liability	2,901	8,993
Dividend payable	10,024	9,954
Labor related liabilities	22,365	20,196
Sales taxes payable and other	26,970	18,199
Accrued liabilities	$ 98,572	$ 88,485

Debt (Details)

Debt (Details)	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)lease	Dec. 31, 2016USD ($)
Debt
Capital lease obligations	$ 0	$ 3,750,000	$ 0
Outstanding liability	1,100,000
Long-term portion	1,600,000
Amount of interest costs incurred, capitalized, and expensed
Interest costs incurred	1,224,000	1,249,000	1,167,000
Less: Interest capitalized	(160,000)	(72,000)	(20,000)
Interest expense	$ 1,064,000	1,177,000	1,147,000
Base rate
Debt
Credit facility, interest rate basis	base rate
Line of credit
Debt
Credit facility, total available credit	$ 304,000,000
Primary Revolving Credit Facility
Debt
Credit facility, total available credit	300,000,000
Credit facility, remaining borrowing capacity	3,400,000
Total outstanding balances	$ 800,000	$ 0	$ 0
Primary Revolving Credit Facility | Minimum
Debt
Facility fees on the available commitment of the facility (as a percent)	0.15%
Debt Instrument, Interest Rate, Stated Percentage	0.49%
Primary Revolving Credit Facility | Maximum
Debt
Facility fees on the available commitment of the facility (as a percent)	0.30%
Debt Instrument, Interest Rate, Stated Percentage	9.50%
Primary Revolving Credit Facility | LIBOR
Debt
LIBOR Rate	2.46%
Primary Revolving Credit Facility | LIBOR | Minimum
Debt
Credit facility, interest rate spread (as a percent)	0.60%
Primary Revolving Credit Facility | LIBOR | Maximum
Debt
Credit facility, interest rate spread (as a percent)	1.45%
Primary Revolving Credit Facility | Base rate | Minimum
Debt
Credit facility, interest rate spread (as a percent)	0.00%
Primary Revolving Credit Facility | Base rate | Maximum
Debt
Credit facility, interest rate spread (as a percent)	0.45%
Cisco Systems Capital Corporation
Debt
Number of Capital Lease Obligations | lease		2
Capital Lease Obligations, Term		4 years
Capital lease obligations	$ 4,400,000
Cisco Systems Capital Corporation | Minimum
Debt
Debt Instrument, Interest Rate, Stated Percentage		2.89%
Cisco Systems Capital Corporation | Maximum
Debt
Debt Instrument, Interest Rate, Stated Percentage		3.50%

Commitments and Contingencies_2

Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Rental expense	$ 6,900	$ 6,400	$ 5,900
Minimum rental commitments
2,019	6,962
2,020	5,830
2,021	4,481
2,022	3,457
2,023	2,399
Thereafter	8,563
Minimum rental commitments under all non-cancelable leases	31,692
Future minimum commitments
Contractual Obligation, Due in 2019	30,832
Contractual Obligation, Due in 2020	3,977
Contractual Obligation, Due in 2021	2,241
Contractual Obligation, Due in 2022	583
Contractual Obligation, Due in 2023	0
Thereafter	0
Total commitments	37,633
Debt Interest Obligations
Future minimum commitments
Contractual Obligation, Due in 2019	1,234
Contractual Obligation, Due in 2020	450
Contractual Obligation, Due in 2021	250
Contractual Obligation, Due in 2022	0
Contractual Obligation, Due in 2023	0
Thereafter	0
Total commitments	1,934
Capital Lease Obligations
Future minimum commitments
Contractual Obligation, Due in 2019	1,160
Contractual Obligation, Due in 2020	1,160
Contractual Obligation, Due in 2021	484
Contractual Obligation, Due in 2022	0
Contractual Obligation, Due in 2023	0
Thereafter	0
Total commitments	2,804
Purchase Obligations
Future minimum commitments
Contractual Obligation, Due in 2019	28,438
Contractual Obligation, Due in 2020	2,367
Contractual Obligation, Due in 2021	1,507
Contractual Obligation, Due in 2022	583
Contractual Obligation, Due in 2023	0
Thereafter	0
Total commitments	$ 32,895

Commitments and Contingencies -

Commitments and Contingencies - Employee Relations (Details)	12 Months Ended
	Dec. 31, 2018
Collective bargaining arrangements
Percentage of employees represented by labor unions	14.00%

Commitments and Contingencies L

Commitments and Contingencies Litigation Details (Details) $ in Millions	Nov. 20, 2017USD ($)
Nishimura v. Gentry Homes, Ltd
Loss Contingencies [Line Items]
Amount awarded from other party	$ 90

Income Taxes - Tax Cuts and Job

Income Taxes - Tax Cuts and Jobs Act (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Provisional income tax benefit			$ 2,800
Mandatory deemed repatriation of foreign earnings			3,800
Measurement period adjustment, income tax benefit		$ 700
Transition tax		600
Pre-tax loss carryforwards	$ 37,000	37,000
Operating loss carryforwards, subject to expiration	900	900
Deferred tax asset valuation allowance	(13,254)	(13,254)	(11,114)
Increase (decrease) in the valuation allowance		$ 2,100	(4,200)
Provisional liability			3,200
Undistributed earnings of foreign subsidiaries			$ 23,900
Foreign earnings repatriated	63,000
Taxes on foreign earnings repatriated	$ 1,000

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current
Federal									$ 27,410	$ 36,077	$ 39,649
State									9,515	6,357	7,053
Foreign									4,605	3,068	3,333
Deferred
Federal									3,179	6,093	260
State									263	544	13
Foreign									523	(338)	(1,142)
Income tax expense (benefit)	$ 5,293	$ 16,473	$ 16,476	$ 7,253	$ 10,829	$ 16,581	$ 16,712	$ 7,679	45,495	51,801	49,166
Income and loss from continuing operations before income taxes
Domestic									169,109	132,105	131,827
Foreign									3,019	12,313	7,073
Income before taxes	$ 18,050	$ 60,834	$ 60,562	$ 32,682	$ 23,914	$ 44,778	$ 44,926	$ 30,800	$ 172,128	$ 144,418	$ 138,900
Reconciliations between the statutory federal income tax rates and effective income tax rates
Federal tax rate									21.00%	35.00%	35.00%
State taxes, net of federal benefit									4.50%	3.20%	3.40%
Tax benefit of domestic manufacturing deduction									0.00%	(2.00%)	(2.50%)
Mandatory deemed repatriation of foreign earnings									0.00%	2.70%	0.00%
Change in U.S. tax rate applied to deferred taxes									0.00%	(1.90%)	0.00%
Change in U.S. tax rate applied to deferred taxes									1.30%	1.30%	(0.10%)
True-up of prior year tax returns to tax provision									(1.20%)	(0.50%)	(0.20%)
Difference between United States statutory and foreign local tax rates									0.50%	(0.80%)	(0.30%)
Change in uncertain tax position									(0.10%)	0.00%	(0.20%)
Other									(0.40%)	1.10%	(0.30%)
Effective income tax rate									26.40%	35.90%	35.40%

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets
State tax	$ 919	$ 1,390
Workers’ compensation	785	822
Health claims	445	487
Vacation liability	370	1,008
Allowance for doubtful accounts	171	104
Inventories	5,659	5,385
Sales incentive and advertising allowances	799	709
Stock-based compensation	3,074	2,967
Unrealized foreign exchange gain or loss	440	291
Foreign tax credit carryforwards	5,043	4,453
Uncertain tax positions’ unrecognized tax benefits	39	31
Foreign tax loss carry forward	8,091	6,892
Other	1,813	1,291
Deferred tax assets, gross	27,648	25,830
Less valuation allowances	13,254	11,114
Deferred tax assets, net, noncurrent	14,394	14,716
Deferred tax liabilities
Depreciation	(9,189)	(7,050)
Goodwill and other intangibles amortization	(13,027)	(11,331)
Tax effect on cumulative translation adjustment	(497)	(487)
Deferred tax liabilities	(22,713)	(18,868)
Total Deferred tax asset/(liability)	(8,319)	(4,152)
Operating loss carryforwards
Deferred tax assets, net, noncurrent	14,394	$ 14,716
Pre-tax loss carryforwards	$ 37,000

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of unrecognized tax benefits
Balance at the beginning of the period	$ 1,895	$ 1,119	$ 1,107
Additions based on tax positions related to prior years	0	660	204
Reductions based on tax positions related to prior years	(171)	(1)	0
Additions for tax positions of the current year	100	319	155
Lapse of statute of limitations	(67)	(202)	(347)
Balance at the end of the period	1,757	1,895	1,119
Portion of uncertain tax benefit, if recognized, would reduce effective tax rate	100	0	0
Increase (decrease) in accrued interest as a result of the reversal of accrued interest associated with the lapse of statutes of limitations	5	200	(61)
Interest accrued on unrecognized tax benefits	$ 400	$ 400	$ 200

Retirement Plans (Details)

Retirement Plans (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)plan	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution percent	7.00%	7.00%	7.00%
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of defined contribution retirement plans | plan	6
Entity's contribution to retirement plans as percentage of employees' compensation	3.00%
Cost of defined contribution plans | $	$ 15.8	$ 14.2	$ 10.1
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of defined contribution retirement plans | plan	4
Switzerland | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions to pension funds | $	$ 4.5	$ 4	$ 3.1
Minimum | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Entity's contribution to retirement plans as percentage of employees' compensation	3.00%
Maximum | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Entity's contribution to retirement plans as percentage of employees' compensation	15.00%

Segment Information (Details)

Segment Information (Details) $ in Thousands	Nov. 30, 2018USD ($)	Dec. 31, 2018USD ($)	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2018USD ($)segment	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment										3
Proceeds from Sale of Property Held-for-sale	$ 17,500
Gain (Loss) on Sale of Properties	$ 8,800
Segment Information
Net sales		$ 241,845	$ 284,178	$ 308,007	$ 244,779	$ 231,681	$ 262,476	$ 263,002	$ 219,867	$ 1,078,809	$ 977,025	$ 860,661
Income from operations		18,871	59,680	60,886	32,895	24,363	46,712	44,614	22,226	172,332	137,915	141,210
Depreciation and amortization										39,393	33,724	27,927
Impairment of goodwill		6,686	0	0	0	0	0	0	0	6,686	0	0
Business Combination, Bargain Purchase, Gain Recognized, Amount										0	6,336	0
Significant non-cash charges										11,176	13,908	13,946
Provision for income taxes		5,293	$ 16,473	$ 16,476	$ 7,253	10,829	$ 16,581	$ 16,712	$ 7,679	45,495	51,801	49,166
Capital expenditures and asset acquisitions, net of cash acquired										31,317	85,962	47,363
Total assets		1,021,663				1,037,523				1,021,663	1,037,523	979,974
Cash and short-term investments		160,180				168,514				160,180	168,514	226,537	$ 258,825
Administrative and all other
Segment Information
Net sales										0	0	0
Income from operations										8,865	901	(178)
Depreciation and amortization										797	901	1,477
Impairment of goodwill										0
Business Combination, Bargain Purchase, Gain Recognized, Amount											0
Significant non-cash charges										3,619	2,473	3,657
Provision for income taxes										2,797	1,824	1,470
Capital expenditures and asset acquisitions, net of cash acquired										0	0	0
Total assets		(280,430)				(150,970)				(280,430)	(150,970)	(64,091)
Cash and short-term investments		113,600				80,200				113,600	80,200	137,400
Intersegment elimination
Segment Information
Net sales										32,344	24,911	31,772
North America
Segment Information
Net sales										910,587	803,697	742,021
Income from operations										164,453	132,995	137,466
Depreciation and amortization										30,505	25,745	19,433
Impairment of goodwill										0
Business Combination, Bargain Purchase, Gain Recognized, Amount											0
Significant non-cash charges										6,340	9,861	9,124
Provision for income taxes										39,638	47,434	45,547
Capital expenditures and asset acquisitions, net of cash acquired										27,059	70,040	37,652
Total assets		1,119,012				953,033				1,119,012	953,033	853,826
North America | Intersegment elimination
Segment Information
Net sales										2,279	3,237	2,512
Europe
Segment Information
Net sales										159,027	165,155	111,274
Income from operations										(3,026)	2,723	2,115
Depreciation and amortization										6,297	5,832	5,809
Impairment of goodwill										6,686
Business Combination, Bargain Purchase, Gain Recognized, Amount											6,336
Significant non-cash charges										1,169	1,509	1,052
Provision for income taxes										2,947	2,124	1,428
Capital expenditures and asset acquisitions, net of cash acquired										2,556	11,411	8,461
Total assets		157,437				208,640				157,437	208,640	165,121
Europe | Intersegment elimination
Segment Information
Net sales										1,773	959	570
Asia/Pacific
Segment Information
Net sales										9,195	8,173	7,366
Income from operations										2,040	1,296	1,807
Depreciation and amortization										1,794	1,246	1,208
Impairment of goodwill										0
Business Combination, Bargain Purchase, Gain Recognized, Amount											0
Significant non-cash charges										48	65	113
Provision for income taxes										113	419	721
Capital expenditures and asset acquisitions, net of cash acquired										1,702	4,511	1,250
Total assets		25,644				$ 26,820				25,644	26,820	25,118
Asia/Pacific | Intersegment elimination
Segment Information
Net sales										28,292	$ 20,715	$ 28,690
Foreign operating entities
Segment Information
Cash and short-term investments		$ 45,500								$ 45,500
Percentage of cash and cash equivalents		28.40%								28.40%

Segment Information - Geographi

Segment Information - Geographic Distribution and Net Sales by Product (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net sales and long-lived assets by geographical area
Net Sales	$ 241,845	$ 284,178	$ 308,007	$ 244,779	$ 231,681	$ 262,476	$ 263,002	$ 219,867	$ 1,078,809	$ 977,025	$ 860,661
Long-Lived Assets	264,346				282,059				264,346	282,059	240,670
Wood construction products
Net sales and long-lived assets by geographical area
Net Sales									913,202	833,200	732,414
Concrete construction products
Net sales and long-lived assets by geographical area
Net Sales									165,317	143,102	128,247
Other
Net sales and long-lived assets by geographical area
Net Sales									290	723	0
United States
Net sales and long-lived assets by geographical area
Net Sales									860,482	758,181	702,071
Long-Lived Assets	210,063				223,184				210,063	223,184	192,787
Canada
Net sales and long-lived assets by geographical area
Net Sales									46,874	43,176	38,269
Long-Lived Assets	4,257				4,650				4,257	4,650	4,473
United Kingdom
Net sales and long-lived assets by geographical area
Net Sales									27,194	23,157	20,751
Long-Lived Assets	1,417				1,459				1,417	1,459	1,183
Germany
Net sales and long-lived assets by geographical area
Net Sales									22,950	21,821	33,062
Long-Lived Assets	13,221				14,153				13,221	14,153	12,582
France
Net sales and long-lived assets by geographical area
Net Sales									40,182	36,677	20,905
Long-Lived Assets	7,891				9,152				7,891	9,152	8,349
Poland
Net sales and long-lived assets by geographical area
Net Sales									10,200	20,409	6,633
Long-Lived Assets	2,794				2,471				2,794	2,471	1,830
Sweden
Net sales and long-lived assets by geographical area
Net Sales									15,461	16,421	0
Long-Lived Assets	1,154				1,068				1,154	1,068	0
Denmark
Net sales and long-lived assets by geographical area
Net Sales									11,682	14,723	15,728
Long-Lived Assets	1,454				1,601				1,454	1,601	1,249
Norway
Net sales and long-lived assets by geographical area
Net Sales									12,324	12,902	0
Long-Lived Assets	0				229				0	229	0
Switzerland
Net sales and long-lived assets by geographical area
Net Sales									6,939	5,593	6,549
Long-Lived Assets	8,067				8,748				8,067	8,748	8,469
Australia
Net sales and long-lived assets by geographical area
Net Sales									6,119	5,501	4,741
Long-Lived Assets	199				268				199	268	239
Belgium
Net sales and long-lived assets by geographical area
Net Sales									5,547	5,050	1,286
Long-Lived Assets	1,961				2,065				1,961	2,065	1,798
The Netherlands
Net sales and long-lived assets by geographical area
Net Sales									5,068	4,834	4,909
Long-Lived Assets	81				110				81	110	21
New Zealand
Net sales and long-lived assets by geographical area
Net Sales									3,061	2,604	2,474
Long-Lived Assets	111				130				111	130	163
Chile
Net sales and long-lived assets by geographical area
Net Sales									3,233	2,314	1,572
Long-Lived Assets	41				61				41	61	56
Other countries
Net sales and long-lived assets by geographical area
Net Sales									1,493	3,662	1,711
Long-Lived Assets	$ 11,635				$ 12,710				$ 11,635	$ 12,710	$ 7,471

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	Jan. 28, 2019	Feb. 25, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Subsequent Events
Cash dividends declared per share of common stock			$ 0.22	$ 0.22	$ 0.22	$ 0.21	$ 0	$ 0.42	$ 0.21	$ 0.18	$ 0.87	$ 0.81	$ 0.70
Diluted			$ 0.28	$ 0.95	$ 0.94	$ 0.54	$ 0.27	$ 0.59	$ 0.59	$ 0.48	$ 2.72	$ 1.94	$ 1.86
Subsequent Event
Subsequent Events
Cash dividends declared per share of common stock	$ 0.22
Dividends	$ 9.8
Accelerated share repurchases program, amount	$ 100
Other General and Administrative Expense		$ 2.9
Increase (Decrease) In Earning Per Share, Diluted		$ 2.78
Diluted		$ 2.72

Selected Quarterly Financial _3

Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended								12 Months Ended
	Oct. 31, 2017	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Net sales		$ 241,845	$ 284,178	$ 308,007	$ 244,779	$ 231,681	$ 262,476	$ 263,002	$ 219,867	$ 1,078,809	$ 977,025	$ 860,661
Cost of sales		143,409	150,282	167,442	137,157	129,777	143,338	140,139	120,390	598,290	533,644	450,781
Gross profit		98,436	133,896	140,565	107,622	101,904	119,138	122,863	99,477	480,519	443,381	409,880
Research and development and other engineering		10,216	10,441	11,249	11,150	12,565	11,265	11,967	11,819	43,056	47,616	46,248
Selling		26,278	26,879	29,201	27,573	28,753	27,867	28,646	29,637	109,931	114,903	98,343
General and administrative		45,195	37,356	39,354	37,188	36,236	33,441	37,586	35,845	159,093	143,107	124,859
Total operating expenses		81,689	74,676	79,804	75,911	77,554	72,573	78,199	77,301	312,080	305,626	269,450
Net gain on disposal of assets		8,810	460	125	1,184	13	147	(50)	50	10,579	160	780
Impairment of goodwill		6,686	0	0	0	0	0	0	0	6,686	0	0
Income from operations		18,871	59,680	60,886	32,895	24,363	46,712	44,614	22,226	172,332	137,915	141,210
Loss in equity investment, before tax		11	30	(2)	24	33	13	12	28	63	86	0
Foreign exchange gain (loss), net		(571)	1,242	(142)	(99)	342	(16)	523	403	430	1,252	(1,733)
Interest (expense) income, net		(239)	(58)	(184)	(90)	(104)	(296)	(199)	(189)
Gain (adjustment) on bargain purchase of a business		0	0	0	0	0	2,052	0	(8,388)
Loss on disposal of a business	$ (200)	0	0	0	0	(654)	443	0	0	0	(211)	0
Income before taxes		18,050	60,834	60,562	32,682	23,914	44,778	44,926	30,800	172,128	144,418	138,900
Provision for income taxes		5,293	16,473	16,476	7,253	10,829	16,581	16,712	7,679	45,495	51,801	49,166
Net income		$ 12,757	$ 44,361	$ 44,086	$ 25,429	$ 13,085	$ 28,197	$ 28,214	$ 23,121	$ 126,633	$ 92,617	$ 89,734
Earnings per share of common stock:
Basic		$ 0.28	$ 0.96	$ 0.95	$ 0.55	$ 0.28	$ 0.60	$ 0.59	$ 0.49	$ 2.74	$ 1.95	$ 1.87
Diluted		0.28	0.95	0.94	0.54	0.27	0.59	0.59	0.48	2.72	1.94	1.86
Cash dividends declared per share of common stock		$ 0.22	$ 0.22	$ 0.22	$ 0.21	$ 0	$ 0.42	$ 0.21	$ 0.18	$ 0.87	$ 0.81	$ 0.70

SCHEDULE II VALUATION AND QUA_2

SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for doubtful accounts
Valuation and qualifying accounts
Balance at Beginning of Year	$ 996	$ 895	$ 1,142
Charged to Costs and Expenses	569	66	(83)
Valuation Allowances and Reserves, Charged to Other Accounts	201	0	0
Deductions	0	(35)	164
Balance at End of Year	1,364	996	895
Sales Returns and Allowances [Member]
Valuation and qualifying accounts
Balance at Beginning of Year	2,956	3,050	2,706
Charged to Costs and Expenses	361	(94)	344
Valuation Allowances and Reserves, Charged to Other Accounts	0	0	0
Deductions	0	0	0
Balance at End of Year	3,317	2,956	3,050
Allowance for deferred tax assets
Valuation and qualifying accounts
Balance at Beginning of Year	11,114	6,868	7,575
Charged to Costs and Expenses	2,477	5,765	358
Valuation Allowances and Reserves, Charged to Other Accounts		0	0
Deductions	337	1,519	1,065
Balance at End of Year	$ 13,254	$ 11,114	$ 6,868