Nature of Operations and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Property, Plant and Equipment

Depreciation and amortization are computed using the straight line method over the following estimated useful lives:

Buildings and improvements	20 – 40 years
Transportation equipment	5 – 6 years
Machinery and equipment	10 – 12 years

Property, plant, and equipment, net.

	December 31,
	2017			2016
Land, buildings, and improvements	$	72,223		$	67,487
Transportation equipment	3,286			3,253
Machinery and equipment	175,371			164,871
Construction in progress	16,408			10,608
Property, plant, and equipment, at cost	267,288			246,219
Less accumulated depreciation and amortization	(164,237		)	(153,428		)
Property, plant, and equipment, net	$	103,051		$	92,791

Interest Cost

Total interest incurred for 2017, 2016, and 2015 is noted below:

	Year Ended December 31,
	2017		2016		2015
Interest costs charged to expense	$	1,184	$	1,294	$	534
Plus: Interest cost capitalized	293		198		297
Total	$	1,477	$	1,492	$	831