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Property, Plant & Equipment (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	$ 12,994,000
Property, plant and equipment	161,476,000	$ 144,849,000
Accumulated depreciation	(79,867,000)	(76,218,000)
Property, Plant and Equipment, Net	81,609,000	68,631,000
Capital expenditures in progress	4,454,000	3,045,000
Commitments for capital expenditures in progress	$ 1,916,000	$ 1,071,000

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Commitments For Capital Expenditures In Progress

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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