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Significant Accounting Policies - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 13, 2021 $ / shares | Jul. 31, 2021 $ / shares | Sep. 30, 2021 USD ($) uSHigherEducationCampus $ / shares shares | Sep. 30, 2020 $ / shares | Jun. 30, 2021 USD ($) uSHigherEducationCampus | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares shares
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |
Number of long-lived assets marketed for sale | uSHigherEducationCampus |  |  |  |  | 2 |  |  |
Impairment of fixed asset impairment charges |  |  | $ 600,000 |  |  | $ 2,600,000 |  |
Number of long-lived assets sold | uSHigherEducationCampus |  |  | 1 |  |  |  |  |
Gain on sale of asset |  |  | $ 700,000 |  |  |  |  |
Common stock, shares authorized (in shares) | shares |  |  | 32,000,000 |  |  | 32,000,000 |  | 32,000,000
Common stock, par value (in dollars per share) | $ / shares |  |  | $ 0.01 |  |  | $ 0.01 |  | $ 0.01
Common stock, shares issued (in shares) | shares |  |  | 24,600,479 |  |  | 24,600,479 |  | 24,418,939
Common stock, shares outstanding (in shares) | shares |  |  | 24,600,479 |  |  | 24,600,479 |  | 24,418,939
Preferred stock, shares authorized (in shares) | shares |  |  | 8,000,000 |  |  | 8,000,000 |  | 8,000,000
Issued shares of preferred stock (in shares) | shares |  |  | 0 |  |  | 0 |  | 0
Outstanding shares of preferred stock (in shares) | shares |  |  | 0 |  |  | 0 |  | 0
Common stock dividends declared (in dollars per share) | $ / shares |  | $ 0.60 | $ 0.60 | $ 0.60 |  | $ 1.80 | $ 1.80 |
Common stock dividends paid (in dollars per share) | $ / shares | $ 0.60 |  |  |  |  |  |  |
Accumulated other comprehensive income net of tax |  |  | $ 1,956,000 |  |  | $ 1,956,000 |  | $ 48,880,000
Tax from unrealized gains and losses on marketable securities |  |  |  |  |  | 300,000 |  | $ 300,000
Reclassifications from AOCI |  |  | $ 0 |  |  | $ 0 | $ 25,000 |
Reclassifications from AOCI, tax |  |  |  |  |  |  | $ 10,000 |
Two U.S. Higher Education Campus Locations |  |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |
Impairment of fixed asset impairment charges |  |  |  |  | $ 0 |  |  |

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