Number of Consolidated Non Profit Universities

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Significant Accounting Policies - New Accounting Pronouncements (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) university	Sep. 30, 2017 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loss on impairment of assets	$ 10,030	$ 0	$ 10,030	$ 0
Retained earnings	(643,407)		(643,407)			$ (946,236)
Revenues	787,102	$ 818,601	2,436,514	2,434,687
ASU 2014-09 \| Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 7,488		7,488		$ 1,400
Revenues			$ 2,577
ASU 2016-15
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in operating activities				(65,000)
Increase in financing activities				65,000
ASU 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings					$ 2,900
ASU 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in operating activities				1,743
Increase in investing cash flow				$ 3,921
Chile
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of consolidated non profit universities \| university			3