Property And Equipment (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 351,179,000	$ 357,390,000
Less allowance for depreciation	(306,927,000)	(311,406,000)
Property and equipment, net	44,252,000	45,984,000
Net Book Value of Assets Sold		2,900,000
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	299,121,000	301,039,000
Land, buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	33,053,000	37,606,000
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,159,000	8,847,000
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 9,846,000	$ 9,898,000

Net Book Value of Assets Sold

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

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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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