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Pay vs Performance Disclosure - USD ($) | 12 Months Ended
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Dec. 31, 2024 | 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)
2024 | ​ | $ | 2,006,779 | ​ | $ | 3,172,108 | ​ | $ | 1,162,069 | ​ | $ | 1,448,731 | ​ | $ | 171.00 | ​ | $ | 113.82 | ​ | $ | 226,234 | ​ | $ | 340,013
2023 | ​ | $ | 2,016,887 | ​ | $ | 3,085,751 | ​ | $ | 1,196,944 | ​ | $ | 1,672,392 | ​ | $ | 137.84 | ​ | $ | 100.46 | ​ | $ | 204,985 | ​ | $ | 302,302
2022 | ​ | $ | 1,997,113 | ​ | $ | 2,919,364 | ​ | $ | 1,205,110 | ​ | $ | 1,604,033 | ​ | $ | 110.30 | ​ | $ | 90.83 | ​ | $ | 184,675 | ​ | $ | 291,336
2021 | ​ | $ | 1,843,058 | ​ | $ | 1,864,868 | ​ | $ | 1,099,912 | ​ | $ | 1,100,530 | ​ | $ | 89.48 | ​ | $ | 92.11 | ​ | $ | 260,344 | ​ | $ | 327,354
2020 | ​ | $ | 2,105,208 | ​ | $ | 1,830,647 | ​ | $ | 1,322,165 | ​ | $ | 1,222,327 | ​ | $ | 97.20 | ​ | $ | 122.18 | ​ | $ | 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 2024, 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 named executive officers 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 2024, reflects compensation information for our 2024 named executive officers, other than our Chief Executive Officer, as described in the Compensation Discussion and Analysis of this Proxy Statement. For 2023, 2022 and 2021, reflects compensation information for Dr. Meyer, Mr. Bachus, Ms. Marsh and Mr. Briggs, our prior chief executive officer for Orbis Education (each of whom served as named executive officers 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 seven 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, 2024. Those seven companies are: 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 GCU 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 55 of our Annual Report on Form 10-K for the fiscal year ended December 31, 2024, 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 2024, 2023, 2022, 2021 and 2020. Mr. Mueller served as CEO for each of the years presented.
(3) | For 2024, reflects compensation information for our 2024 named executive officers, other than our Chief Executive Officer, as described in the Compensation Discussion and Analysis of this Proxy Statement. For 2023, 2022 and 2021, reflects compensation information for Dr. Meyer, Mr. Bachus, Ms. Marsh and Mr. Briggs, our prior chief executive officer for Orbis Education (each of whom served as named executive officers 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 seven 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, 2024. Those seven companies are: 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 | $ 2,006,779 | $ 2,016,887 | $ 1,997,113 | $ 1,843,058 | $ 2,105,208
PEO Actually Paid Compensation Amount | $ 3,172,108 | 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 Chief Executive Officer’s “Total” compensation as reported in the Summary Compensation Table:
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​ | ​ | 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
2024 | ​ | $ | 2,006,779 | ​ | $ | (1,211,483) | ​ | $ | 2,376,812 | ​ | $ | 3,172,108
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 Chief Executive Officer, 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 Chief Executive Officer 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 | ​ | 2024 | ​ | 2023 |  | 2022 | ​ | 2021 | ​ | 2020
As of year-end for awards granted during the year | ​ | $ | 1,519,573 | ​ | $ | 1,417,053 | ​ | $ | 1,542,425 | ​ | $ | 1,207,911 | ​ | $ | 1,341,808
Year-over-year increase (decrease) of unvested awards granted in prior years | ​ | $ | 821,504 | ​ | $ | 752,305 | ​ | $ | 555,228 | ​ | $ | (209,339) | ​ | $ | (83,431)
Increase (decrease) from prior fiscal year-end for awards that vested during the year | ​ | $ | 35,735 | ​ | $ | 111,149 | ​ | $ | 36,086 | ​ | $ | 234,813 | ​ | $ | (321,405)
Total Equity Award Adjustments | ​ | $ | 2,376,812 | ​ | $ | 2,280,507 | ​ | $ | 2,133,739 | ​ | $ | 1,233,385 | ​ | $ | 936,972
Non-PEO NEO Average Total Compensation Amount | $ 1,162,069 | 1,196,944 | 1,205,110 | 1,099,912 | 1,322,165
Non-PEO NEO Average Compensation Actually Paid Amount | $ 1,448,731 | 1,672,392 | 1,604,033 | 1,100,530 | 1,222,327
Adjustment to Non-PEO NEO Compensation Footnote | To calculate the amounts in the “Average Compensation Actually Paid to Non-Chief Executive Officer NEOs” column in the table above, the following amounts were deducted from and added to (as applicable) the average of the “Total” compensation of our non-Chief Executive Officer named executive officers for each applicable year, as reported in the Summary Compensation Table for that year:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Average Summary | ​ | Average | ​ | Average | ​ | ​ | ​
​ | ​ | Compensation | ​ | Reported Value of | ​ | Equity Award | ​ | Average
​ | ​ | Table Total for | ​ | Equity Awards for | ​ | Adjustments | ​ | Compensation Actually
Year |  | Non-CEO NEOs |  | Non-CEO NEOs (1) |  | for Non-CEO NEOs (2) |  | Paid to Non-CEO NEOs
2024 | ​ | $ | 1,162,069 | ​ | $ | (498,959) | ​ | $ | 785,621 | ​ | $ | 1,448,731
2023 | ​ | $ | 1,196,944 | ​ | $ | (560,802) | ​ | $ | 1,036,250 | ​ | $ | 1,672,392
2022 | ​ | $ | 1,205,110 | ​ | $ | (560,722) | ​ | $ | 959,645 | ​ | $ | 1,604,033
2021 | ​ | $ | 1,099,912 | ​ | $ | (553,324) | ​ | $ | 553,942 | ​ | $ | 1,100,530
2020 | ​ | $ | 1,322,165 | ​ | $ | (609,865) | ​ | $ | 510,027 | ​ | $ | 1,222,327
(1) | Represents the average of the grant date fair value of the equity awards to our named executive officers (other than our Chief Executive Officer), as reported in the “Stock Awards” column in the Summary Compensation Table for each applicable year.
(2) | Represents adjustments for the equity awards granted to our named executive officers (other than our Chief Executive Officer) 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 Non-CEO NEOs | ​ | 2024 | ​ | 2023 | ​ | 2022 | ​ | 2021 | ​ | 2020
As of year-end for awards granted during the year | ​ | $ | 500,442 | ​ | $ | 655,876 | ​ | $ | 713,892 | ​ | $ | 551,651 | ​ | $ | 675,443
Year-over-year increase (decrease) of unvested awards granted in prior years | ​ | $ | 255,876 | ​ | $ | 334,835 | ​ | $ | 232,133 | ​ | $ | (79,117) | ​ | $ | (34,816)
Increase (decrease) from prior fiscal year-end for awards that vested during the year | ​ | $ | 29,303 | ​ | $ | 45,539 | ​ | $ | 13,620 | ​ | $ | 81,408 | ​ | $ | (130,600)
Total Equity Award Adjustments | ​ | $ | 785,621 | ​ | $ | 1,036,250 | ​ | $ | 959,645 | ​ | $ | 553,942 | ​ | $ | 510,027
​ |  |  |  |
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 | $ 171 | 137.84 | 110.3 | 89.48 | 97.2
Peer Group Total Shareholder Return Amount | 113.82 | 100.46 | 90.83 | 92.11 | 122.18
Net Income (Loss) | $ 226,234 | $ 204,985 | $ 184,675 | $ 260,344 | $ 257,196
Company Selected Measure Amount | 340,013 | 302,302 | 291,336 | 327,354 | 323,830
PEO Name | Mr. Mueller |  |  |  |
Equity Awards Adjustments, Footnote |
(1) | Represents the grant date fair value of the equity awards to our Chief Executive Officer, 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 Chief Executive Officer to arrive at CAP, as itemized in the table below. No awards vested in the year they were granted.
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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair Value of Equity Awards for CEO | ​ | 2024 | ​ | 2023 |  | 2022 | ​ | 2021 | ​ | 2020
As of year-end for awards granted during the year | ​ | $ | 1,519,573 | ​ | $ | 1,417,053 | ​ | $ | 1,542,425 | ​ | $ | 1,207,911 | ​ | $ | 1,341,808
Year-over-year increase (decrease) of unvested awards granted in prior years | ​ | $ | 821,504 | ​ | $ | 752,305 | ​ | $ | 555,228 | ​ | $ | (209,339) | ​ | $ | (83,431)
Increase (decrease) from prior fiscal year-end for awards that vested during the year | ​ | $ | 35,735 | ​ | $ | 111,149 | ​ | $ | 36,086 | ​ | $ | 234,813 | ​ | $ | (321,405)
Total Equity Award Adjustments | ​ | $ | 2,376,812 | ​ | $ | 2,280,507 | ​ | $ | 2,133,739 | ​ | $ | 1,233,385 | ​ | $ | 936,972
(1) | Represents the average of the grant date fair value of the equity awards to our named executive officers (other than our Chief Executive Officer), as reported in the “Stock Awards” column in the Summary Compensation Table for each applicable year.
(2) | Represents adjustments for the equity awards granted to our named executive officers (other than our Chief Executive Officer) 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 Non-CEO NEOs | ​ | 2024 | ​ | 2023 | ​ | 2022 | ​ | 2021 | ​ | 2020
As of year-end for awards granted during the year | ​ | $ | 500,442 | ​ | $ | 655,876 | ​ | $ | 713,892 | ​ | $ | 551,651 | ​ | $ | 675,443
Year-over-year increase (decrease) of unvested awards granted in prior years | ​ | $ | 255,876 | ​ | $ | 334,835 | ​ | $ | 232,133 | ​ | $ | (79,117) | ​ | $ | (34,816)
Increase (decrease) from prior fiscal year-end for awards that vested during the year | ​ | $ | 29,303 | ​ | $ | 45,539 | ​ | $ | 13,620 | ​ | $ | 81,408 | ​ | $ | (130,600)
Total Equity Award Adjustments | ​ | $ | 785,621 | ​ | $ | 1,036,250 | ​ | $ | 959,645 | ​ | $ | 553,942 | ​ | $ | 510,027
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 55 of our Annual Report on Form 10-K for the fiscal year ended December 31, 2024, 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 | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ (1,211,483) | $ (1,211,643) | $ (1,211,488) | $ (1,211,575) | $ (1,211,533)
PEO | Equity Awards Adjustments, Excluding Value Reported in Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 2,376,812 | 2,280,507 | 2,133,739 | 1,233,385 | 936,972
PEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 1,519,573 | 1,417,053 | 1,542,425 | 1,207,911 | 1,341,808
PEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 821,504 | 752,305 | 555,228 | (209,339) | (83,431)
PEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 35,735 | 111,149 | 36,086 | 234,813 | (321,405)
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (498,959) | (560,802) | (560,722) | (553,324) | (609,865)
Non-PEO NEO | Equity Awards Adjustments, Excluding Value Reported in Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 785,621 | 1,036,250 | 959,645 | 553,942 | 510,027
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 500,442 | 655,876 | 713,892 | 551,651 | 675,443
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 255,876 | 334,835 | 232,133 | (79,117) | (34,816)
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ 29,303 | $ 45,539 | $ 13,620 | $ 81,408 | $ (130,600)

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