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Pay vs Performance Disclosure - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pay vs Performance Disclosure |  |  |  |
Pay vs Performance Disclosure, Table | ​
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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Value of Initial Fixed $100 | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | Average | ​ | Investment Based on: | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Summary | ​ | ​ | ​ | ​ | Summary | ​ | Compensation | ​ | ​ | ​ | ​ | Peer Group | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Compensation | ​ | Compensation | ​ | Compensation | ​ | Actually Paid | ​ | Total | ​ | Total | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Table | ​ | Actually Paid | ​ | Table Total for | ​ | to Non-CEO | ​ | Shareholder | ​ | Shareholder | ​ | Net | ​ | Adjusted
Year | ​ | Total for CEO (1) | ​ | to CEO (2) | ​ | Non-CEO NEOs (3) | ​ | NEOs (2) (3) | ​ | Return | ​ | Return (4) | ​ | Income (5) | ​ | EBITDA (6)
2023 | ​ | $ | 2,016,887 | ​ | $ | 3,085,751 | ​ | $ | 1,196,944 | ​ | $ | 1,672,392 | ​ | $ | 137.84 | ​ | $ | 98.69 | ​ | $ | 204,985 | ​ | $ | 302,302
2022 | ​ | $ | 1,997,113 | ​ | $ | 2,919,364 | ​ | $ | 1,205,110 | ​ | $ | 1,604,033 | ​ | $ | 110.30 | ​ | $ | 92.68 | ​ | $ | 184,675 | ​ | $ | 291,336
2021 | ​ | $ | 1,843,058 | ​ | $ | 1,864,868 | ​ | $ | 1,099,912 | ​ | $ | 1,100,530 | ​ | $ | 89.48 | ​ | $ | 100.13 | ​ | $ | 260,344 | ​ | $ | 327,354
2020 | ​ | $ | 2,105,208 | ​ | $ | 1,830,647 | ​ | $ | 1,322,165 | ​ | $ | 1,222,327 | ​ | $ | 97.20 | ​ | $ | 124.90 | ​ | $ | 257,196 | ​ | $ | 323,830
(1) | The dollar amounts reported are the amounts of total compensation reported for our CEO, Mr. Mueller, in the Summary Compensation Table for fiscal years 2023, 2022, 2021 and 2020. Mr. Mueller served as CEO for each of the years presented.
(2) | The dollar amounts reported represent the amount of “compensation actually paid” or “CAP”, as computed in accordance with SEC rules. The dollar amounts do not reflect the actual amounts of compensation paid to our CEO or other NEOs during the applicable years, but include (i) the year-end value of equity awards granted during the reported year, and (ii) the change in the value of equity awards that were unvested at the end of the prior year, measured through the date the awards vested or were forfeited, or through the end of the reported fiscal year.
(3) | For 2023, 2022 and 2021, reflects compensation information for our 2023 NEOs, other than our CEO, as described in the CD&A of this proxy statement (each of whom served as NEOs for 2023, 2022 and 2021). For 2020, reflects compensation information for Dr. Meyer, Mr. Bachus, Mr. Briggs and Mr. Joseph Mildenhall, our prior chief information officer.
(4) | Reflects cumulative total shareholder return for the eight companies included in the customized peer group used by GCE for purposes of Item 201 (e) of Regulation S-K under the Exchange Act in GCE’s Annual Report on Form 10-K for the year ended December 31, 2023. Those eight companies are: 2U Inc, Adtalem Global Education, Inc, Chegg Inc, Coursera Inc, John Wiley & Sons Inc, Laureate Education Inc, Pearson Plc and Strategic Education Inc.
(5) | The decline in net income between 2021 and 2022 is partially due to the lower interest income achieved as a result of the repayment to us by Grand Canyon University of a secured note payable that had been in place since 2018.
(6) | We defined Adjusted EBITDA for purposes of the Annual Cash Incentive Plan in a manner consistent with the definition we use when reporting our financial results. See Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations – Adjusted EBITDA (Non- GAAP Financial Measure), beginning on page 63 of our Annual Report on Form 10-K for the fiscal year ended December 31, 2023 for information regarding our use and calculation of Adjusted EBITDA.
Company Selected Measure Name | Adjusted EBITDA |  |  |
Named Executive Officers, Footnote |
(1) | The dollar amounts reported are the amounts of total compensation reported for our CEO, Mr. Mueller, in the Summary Compensation Table for fiscal years 2023, 2022, 2021 and 2020. Mr. Mueller served as CEO for each of the years presented.
(3) | For 2023, 2022 and 2021, reflects compensation information for our 2023 NEOs, other than our CEO, as described in the CD&A of this proxy statement (each of whom served as NEOs for 2023, 2022 and 2021). For 2020, reflects compensation information for Dr. Meyer, Mr. Bachus, Mr. Briggs and Mr. Joseph Mildenhall, our prior chief information officer.
Peer Group Issuers, Footnote |
(4) | Reflects cumulative total shareholder return for the eight companies included in the customized peer group used by GCE for purposes of Item 201 (e) of Regulation S-K under the Exchange Act in GCE’s Annual Report on Form 10-K for the year ended December 31, 2023. Those eight companies are: 2U Inc, Adtalem Global Education, Inc, Chegg Inc, Coursera Inc, John Wiley & Sons Inc, Laureate Education Inc, Pearson Plc and Strategic Education Inc.
PEO Total Compensation Amount | $ 2,016,887 | $ 1,997,113 | $ 1,843,058 | $ 2,105,208
PEO Actually Paid Compensation Amount | $ 3,085,751 | 2,919,364 | 1,864,868 | 1,830,647
Adjustment To PEO Compensation, Footnote | To calculate the amounts in the “Compensation Actually Paid to CEO” column in the table above, the following amounts were deducted from and added to (as applicable) our CEO’s “Total” compensation as reported in the Summary Compensation Table:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Summary | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Compensation | ​ | Reported | ​ | Equity Award | ​ | ​ | ​
​ | ​ | Table Total for | ​ | Value of Equity | ​ | Adjustments | ​ | Compensation
Year |  | CEO |  | Awards for CEO (1) |  | for CEO (2) |  | Actually Paid to CEO
2023 | ​ | $ | 2,016,887 | ​ | $ | (1,211,643) | ​ | $ | 2,280,507 | ​ | $ | 3,085,751
2022 | ​ | $ | 1,997,113 | ​ | $ | (1,211,488) | ​ | $ | 2,133,739 | ​ | $ | 2,919,364
2021 | ​ | $ | 1,843,058 | ​ | $ | (1,211,575) | ​ | $ | 1,233,385 | ​ | $ | 1,864,868
2020 | ​ | $ | 2,105,208 | ​ | $ | (1,211,533) | ​ | $ | 936,972 | ​ | $ | 1,830,647
(1) | Represents the grant date fair value of the equity awards to our CEO, as reported in the “Stock Awards” column in the Summary Compensation Table for each applicable year.
(2) | Represents the adjustments to equity awards granted to our CEO to arrive at CAP, as itemized in the table below. No awards vested in the year they were granted.
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair Value of Equity Awards for CEO | ​ | 2023 |  | 2022 | ​ | 2021 | ​ | 2020
As of year-end for awards granted during the year | ​ | $ | 1,417,053 | ​ | $ | 1,542,425 | ​ | $ | 1,207,911 | ​ | $ | 1,341,808
Year-over-year increase (decrease) of unvested awards granted in prior years | ​ | $ | 752,305 | ​ | $ | 555,228 | ​ | $ | (209,339) | ​ | $ | (83,431)
Increase (decrease) from prior fiscal year-end for awards that vested during the year | ​ | $ | 111,149 | ​ | $ | 36,086 | ​ | $ | 234,813 | ​ | $ | (321,405)
Total Equity Award Adjustments | ​ | $ | 2,280,507 | ​ | $ | 2,133,739 | ​ | $ | 1,233,385 | ​ | $ | 936,972
Non-PEO NEO Average Total Compensation Amount | $ 1,196,944 | 1,205,110 | 1,099,912 | 1,322,165
Non-PEO NEO Average Compensation Actually Paid Amount | $ 1,672,392 | 1,604,033 | 1,100,530 | 1,222,327
Adjustment to Non-PEO NEO Compensation Footnote | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair Value of Equity Awards for CEO | ​ | 2023 |  | 2022 | ​ | 2021 | ​ | 2020
As of year-end for awards granted during the year | ​ | $ | 1,417,053 | ​ | $ | 1,542,425 | ​ | $ | 1,207,911 | ​ | $ | 1,341,808
Year-over-year increase (decrease) of unvested awards granted in prior years | ​ | $ | 752,305 | ​ | $ | 555,228 | ​ | $ | (209,339) | ​ | $ | (83,431)
Increase (decrease) from prior fiscal year-end for awards that vested during the year | ​ | $ | 111,149 | ​ | $ | 36,086 | ​ | $ | 234,813 | ​ | $ | (321,405)
Total Equity Award Adjustments | ​ | $ | 2,280,507 | ​ | $ | 2,133,739 | ​ | $ | 1,233,385 | ​ | $ | 936,972
Compensation Actually Paid vs. Total Shareholder Return |  |  |  |
Compensation Actually Paid vs. Net Income | ​ |  |  |
Compensation Actually Paid vs. Company Selected Measure |  |  |  |
Total Shareholder Return Vs Peer Group |  |  |  |
Tabular List, Table | Most Important Financial Performance Measures
| ● | Adjusted EBITDA
| ● | Service Revenue
| ● | Return on Equity
| ● | Free Cash Flow
| ● | Total Shareholder Return
| ● | As Adjusted Non-GAAP Diluted EPS
| ● | Net Income
Total Shareholder Return Amount | $ 137.84 | 110.30 | 89.48 | 97.20
Peer Group Total Shareholder Return Amount | 98.69 | 92.68 | 100.13 | 124.90
Net Income (Loss) | $ 204,985 | $ 184,675 | $ 260,344 | $ 257,196
Company Selected Measure Amount | 302,302 | 291,336 | 327,354 | 323,830
PEO Name | Mr. Mueller |  |  |
Measure:: 1 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Adjusted EBITDA |  |  |
Non-GAAP Measure Description |
(6) | We defined Adjusted EBITDA for purposes of the Annual Cash Incentive Plan in a manner consistent with the definition we use when reporting our financial results. See Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations – Adjusted EBITDA (Non- GAAP Financial Measure), beginning on page 63 of our Annual Report on Form 10-K for the fiscal year ended December 31, 2023 for information regarding our use and calculation of Adjusted EBITDA.
Measure:: 2 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Service Revenue |  |  |
Measure:: 3 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Return on Equity |  |  |
Measure:: 4 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Free Cash Flow |  |  |
Measure:: 5 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Total Shareholder Return |  |  |
Measure:: 6 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | As Adjusted Non-GAAP Diluted EPS |  |  |
Measure:: 7 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Net Income |  |  |
PEO | Reported Value of Equity Awards |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | $ (1,211,643) | $ (1,211,488) | $ (1,211,575) | $ (1,211,533)
PEO | Equity Award Adjustments |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 2,280,507 | 2,133,739 | 1,233,385 | 936,972
PEO | As of year-end for awards granted during the year |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 1,417,053 | 1,542,425 | 1,207,911 | 1,341,808
PEO | Year-over-year increase (decrease) of unvested awards granted in prior years |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 752,305 | 555,228 | (209,339) | (83,431)
PEO | Increase (decrease) from prior fiscal year-end for awards that vested during the year |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 111,149 | 36,086 | 234,813 | (321,405)
Non-PEO NEO | Reported Value of Equity Awards |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (560,802) | (560,722) | (553,324) | (609,865)
Non-PEO NEO | Equity Award Adjustments |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 1,036,250 | 959,645 | 553,942 | 510,027
Non-PEO NEO | As of year-end for awards granted during the year |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 655,876 | 713,892 | 551,651 | 675,443
Non-PEO NEO | Year-over-year increase (decrease) of unvested awards granted in prior years |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 334,835 | 232,133 | (79,117) | (34,816)
Non-PEO NEO | Increase (decrease) from prior fiscal year-end for awards that vested during the year |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | $ 45,539 | $ 13,620 | $ 81,408 | $ (130,600)

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