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Line of Credit (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jul. 01, 2019	Jun. 30, 2019
Line of Credit Facility [Line Items]
Amount outstanding under line of credit	$ 20,000,000	$ 68,000,000
Interest expense on borrowings	$ 1,600,000	$ 4,300,000	$ 5,000,000.0
Line of credit | US Bank
Line of Credit Facility [Line Items]
Effective interest rate	1.39%	3.03%
Commitment fees	$ 0
Line of credit | US Bank | LIBOR | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.25%
Line of credit | US Bank | LIBOR | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.75%
Line of credit | US Bank | Base rate | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.00%
Line of credit | US Bank | Base rate | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
Line of credit | US Bank | Enson
Line of Credit Facility [Line Items]
Ownership interest used to secure obligations	65.00%
Line of credit | Second Amended Credit Agreement
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 125,000,000.0	$ 130,000,000.0
Letter of credit
Line of Credit Facility [Line Items]
Letter of credit outstanding amount	$ 2,700,000

X

- Definition

Line of Credit Facility, Covenants, Subsidiary Ownership Percentage Securing Facility

+ References

No definition available.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
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- Definition

The aggregate interest expense incurred on short-term borrowings including commercial paper and Federal funds purchased and securities sold under agreements to repurchase.

+ References

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-Publisher FASB
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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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- Definition

Amount of the fee for available but unused credit capacity under the credit facility.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The carrying value as of the balance sheet date of the current portion 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.

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