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Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in carrying amount
Balance, beginning of period		$ 20,744	$ 20,744
Additions		723,929
Impairments	$ 0	(13,944)	0	$ 0
Adjustments		1,811
Balance, end of period	732,540	732,540	20,744	20,744
Strayer University
Changes in carrying amount
Balance, beginning of period		6,800	6,800
Additions		330,581
Balance, end of period	337,381	337,381	6,800	6,800
Capella University
Changes in carrying amount
Additions		393,348
Adjustments		1,811
Balance, end of period	$ 395,159	395,159
Non-Degree Programs
Changes in carrying amount
Balance, beginning of period		13,944	13,944
Impairments		$ (13,944)
Balance, end of period			$ 13,944	$ 13,944

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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