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Inventory (Narrative) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) a Building | Dec. 31, 2017 USD ($)
Real Estate [Line Items] |  |
Purchase of inventory | $ 2,235 | $ (93)
Alabama [Member] |  |
Real Estate [Line Items] |  |
Area of campus | a | 110 |
Number of buildings | Building | 3 |
Purchase of inventory | $ 2,300 |

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- Definition Area of a real estate property. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Details
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