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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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 102,045	$ 94,620
Less accumulated depreciation	(48,797)	(51,099)
Property and equipment, net	53,248	43,521
Depreciation	8,810	6,725	$ 7,608
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,828	3,828
Building and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	24,060	24,038
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	483	429
Revenue-generating assets
Property, Plant and Equipment [Line Items]
Property and equipment, gross	42,424	28,453
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	17,239	24,764
Office and computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	13,980	13,057
Motor vehicles
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 31	$ 51