Fair value portion of assets classified as held for sale.

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Amount classified as assets attributable to disposal group held for sale or disposed of.

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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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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Assets Held for Sale (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Assets Held for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of assets held for sale	$ 822	$ 0	$ 822	$ 0
Loss on disposals of long-lived assets	4,323	$ 43	5,048	$ 60
American Public Education Segment \| Disposal Group, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of assets held for sale	800		800
Charles Town, West Virginia \| American Public Education Segment \| Disposal Group, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale, fair value	2,100		2,100
Impairment of assets held for sale	500		500
Assets held for sale, carrying value					$ 1,100
Net sales price of assets held for sale	800		$ 800
Loss on disposals of long-lived assets	$ 300