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Commitments and Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Campus Lease	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies (Textual)
Number of long-term, non-cancelable operating leases	99
Rent expense	$ 82.2	$ 46.5	$ 42.2
Charges related to the closure of campuses and other administrative facilities	$ 36.0
Number of locations to be closed	20

- Definition

Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation.

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