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Assets Manufactured for Internal Use, net - Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets manufactured for internal use
Cost	$ 40,709	$ 102,252
Accumulated depreciation	(15,381)	(61,103)
Net	25,328	41,149
Depreciation expense	$ 2,600	3,200	$ 2,200
Assets Manufactured for Internal Use
Assets manufactured for internal use
Useful life	10 years
Cost	$ 62,017	49,118
Accumulated depreciation	(19,259)	(19,285)
Net	42,758	29,833
Depreciation expense	3,900	2,600	$ 2,800
Assets Manufactured for Internal Use | Internal use assets
Assets manufactured for internal use
Cost	56,775	47,509
Assets Manufactured for Internal Use | Construction in process.
Assets manufactured for internal use
Cost	$ 5,242	$ 1,609

X

- Definition

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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- Definition

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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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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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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