Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Current assets
Cash and cash equivalents	$ 137,413	$ 168,514	$ 167,059
Trade accounts receivable, net	167,146	135,958	148,506
Inventories	256,552	252,996	256,271
Other current assets	22,423	26,473	13,744
Total current assets	583,534	583,941	585,580
Property, plant and equipment, net	276,114	273,020	250,465
Goodwill	138,026	137,140	135,113
Equity investment (see Note 9)	2,525	2,549	2,607
Intangible assets, net	28,302	29,326	31,713
Other noncurrent assets	11,841	11,547	12,722
Total assets	1,040,342	1,037,523	1,018,200
Current liabilities
Capital lease obligations - current portion	1,064	1,055	521
Trade accounts payable	42,098	31,536	38,219
Accrued liabilities	84,997	84,204	67,183
Income taxes payable	0	0	2,290
Accrued profit sharing trust contributions	2,730	7,054	2,514
Accrued cash profit sharing and commissions	9,102	9,416	9,256
Accrued workers’ compensation	3,237	3,226	3,578
Total current liabilities	143,228	136,491	123,561
Capital lease obligations - net of current portion	2,425	2,607	1,610
Deferred income tax and other long-term liabilities	15,627	13,647	6,076
Total liabilities	161,280	152,745	131,247
Commitments and contingencies (see Note 11)
Stockholders’ equity
Common stock, at par value	475	473	475
Additional paid-in capital	269,004	260,157	259,167
Retained Earnings	693,218	676,644	656,959
Treasury stock	(74,999)	(40,000)	0
Accumulated other comprehensive loss	(8,636)	(12,496)	(29,648)
Total stockholders’ equity	879,062	884,778	886,953
Total liabilities and stockholders’ equity	$ 1,040,342	$ 1,037,523	$ 1,018,200

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.