Assets Held For Sale (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on assets held for sale	$ 823	$ 0	$ 0
Loss on disposals of long-lived assets	5,147	$ 817	$ 115
APEI Segment \| Disposal group, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on assets held for sale	800
Charles Town, West Virginia \| APEI Segment \| Disposal group, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Fair value of assets held for sale	2,100
Loss on assets held for sale	500
Disposal group assets	1,100
Net sale price	800
Loss on disposals of long-lived assets	$ 300

Fair value portion of assets classified as held for sale.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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Amount classified as assets attributable to disposal group held for sale or disposed of.

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