Impairment Charges (Notes)	12 Months Ended
Impairment Charges (Notes)	Dec. 31, 2019
Impaired Long-Lived Assets Held and Used [Line Items]
Asset Impairment Charges [Text Block]	Impairment Charges On November 22, 2019, the Company completed the sale of substantially all of its public charter school portfolio, consisting of 47 public charter school related assets, for net proceeds of approximately $449.6 million. Prior to the sale, the Company revised its estimated undiscounted cash flows associated with this portfolio, considering a shorter expected hold period and determined that the estimated cash flows were not sufficient to recover the carrying value of this portfolio. The Company estimated the fair value of this portfolio by taking into account the purchase price in the executed sale agreement. The Company recognized an impairment on public charter school portfolio sale of $21.4 million that included the write-off of non-cash straight-line rent and effective interest receivables totaling $24.8 million. This impairment and the operating results of all of the public charter schools sold in 2019 have been classified within discontinued operations in the accompanying consolidated statements of income and comprehensive income. See Note 18 for further details on discontinued operations. During the year ended December 31, 2019, the Company entered into an agreement to sell a theatre property for approximately $6.2 million. As a result, the Company revised its estimated undiscounted cash flow associated with this property, considering a shorter expected hold period and determined that the estimated cash flow was not sufficient to recover the carrying value of this property. The Company estimated the fair value of this property by taking into account the purchase price in the executed sale agreement. The Company recorded an impairment charge of approximately $2.2 million, which is the amount that the carrying value of the asset exceeds the estimated fair value. The sale of this property is expected to close in 2020. During the year ended December 31, 2018, the Company entered into an agreement with Children’s Learning Adventure USA (CLA) in which CLA relinquished control of four of the Company’s properties that were still under development as the Company no longer intended to develop these properties for CLA. As a result, the Company revised its estimated undiscounted cash flows for these four properties, considering shorter expected holding periods, and determined that those estimated cash flows were not sufficient to recover the carrying values of these four properties. During the year ended December 31, 2018, the Company determined the estimated fair value of these properties using Level 3 inputs, including independent appraisals of these properties, and reduced the carrying value of these assets to $9.8 million, recording an impairment charge of $16.5 million. The charge was primarily related to the cost of improvements specific to the development of CLA’s prototype. For further discussion on CLA, see Note 19. During the year ended December 31, 2018, the Company recognized a $10.7 million impairment charge related to the Company’s guarantees of the payment of two economic development revenue bonds secured by leasehold interests and improvements at two theatres in Louisiana. In accordance with Topic 460, Guarantees, the Company recorded an asset and liability at the inception of the guarantees at fair value, which represented the Company's obligation to stand ready to perform under the terms of the guarantees. During the year ended December 31, 2018, the Company determined that a portion of its asset was no longer recoverable and recorded an impairment charge of $7.8 million. A contingent future obligation is recognized in accordance with the provisions of Topic 450, Accounting for Contingencies. In the case of the Company’s guarantees, the contingent future obligation is the future payment of the bonds by the Company. At the inception of the guarantees, the Company determined that its future payment of the bonds was not probable, therefore no contingent future obligation was recorded. For the year ended December 31, 2018, the Company determined that its future payment on a portion of the bond obligations was probable due to inadequate performance of the theatre properties and failure of the debtor under the bonds to perform. Accordingly, for the year ended December 31, 2018, the Company recorded an incremental contingent liability of $2.9 million, which in addition to the $7.8 million discussed above, resulted in a total impairment charge recognized relating to the guarantees of $10.7 million. For a discussion of impairment charges recorded during the year ended December 31, 2017, totaling $10.2 million, see Note 7.