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Long Term Debt (Details) - USD ($) |  | 6 Months Ended |
--- | --- | --- | ---
Nov. 03, 2020 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |  |
Money market funds |  | $ 262,941,000 | $ 261,585,000 | $ 268,918,000
Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Revolving credit facility, outstanding |  | 141,400,000 |  | 141,600,000
Interest paid |  | 1,200,000 | $ 1,400,000 |
Revolving Credit Facility | Australia, Dollars |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Revolving credit facility, outstanding |  | $ 3,400,000 |  | $ 3,600,000
Revolving Credit Facility | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Margin rate | 1.50% |  |  |
Unused commitment fee | 0.20% |  |  |
Revolving Credit Facility | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Margin rate | 2.00% |  |  |
Unused commitment fee | 0.30% |  |  |
Amended Credit Facility | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Revolving credit facility, value | $ 350,000,000 |  |  |
Maximum aggregate incremental term loans | $ 300,000,000 |  |  |
Percentage of consolidated EBITDA to be funded | 100.00% |  |  |
Maximum leverage ratio allowed in order to increase obligation | 1.75 |  |  |
Debt financing costs | $ 1,900,000 |  |  |
Debt instrument term | 5 years |  |  |
Maximum total leverage ratio | 2.00 |  |  |
Money market funds | $ 150,000,000 |  |  |
Minimum coverage ratio | 1.75 |  |  |
Minimum department of education financial composite score | 1.0 |  |  |
Minimum department of education financial composite score for two consecutive fiscal years | 1.5 |  |  |
Amendment to the Credit Facility, Subfacility for Borrowings in Foreign Currencies | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Revolving credit facility, value | $ 150,000,000 |  |  |

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- Definition Maximum Aggregate Incremental Term Loans + References No definition available. + Details
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- Definition Maximum leverage ratio to be maintained under credit facility. + References No definition available. + Details
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- Definition Maximum leverage ratio allowed in order to increase obligation + References No definition available. + Details
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- Definition Minimum coverage ratio to be maintained under credit facility. + References No definition available. + Details
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- Definition Minimum Department of Education Financial Composite Score to be Maintained Under Credit Facility for Consecutive Years + References No definition available. + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3044-108585 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126999549&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3367-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3536-108585 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References No definition available. + Details
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