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Debt - Credit Agreement (Details Textual) - USD ($)	1 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Carrying value of debt		$ 374,719,000	$ 351,217,000
Proceeds from long term debt		150,000,000
Principal repayments		128,438,000	10,313,000	$ 7,500,000
Net increase of available cash	$ 30,000,000
Payments of deferred financing costs		3,000,000
Financing costs	3,700,000
Loss on extinguishment of debt		(132,000)
2018 Credit Agreement
Debt Instrument [Line Items]
Credit Agreement	350,000,000
Principal repayments	120,000,000
2018 Credit Agreement | Revolving Loan
Debt Instrument [Line Items]
Credit Agreement			$ 200,000,000
Unamortized debt issuance costs		100,000
Loss on extinguishment of debt		$ 100,000
2021 Credit Agreement
Debt Instrument [Line Items]
Credit Agreement	$ 600,000,000
Debt instrument, payment terms of principal of debt		The 2021 Credit Agreement includes LIBOR transition language in which we can elect an ABR, a Eurodollar rate, an alternate currency term rate, or an alternate currency daily rate.
Payments of deferred financing costs		$ 3,000,000.0
Financing costs		3,400,000
2021 Credit Agreement | Minimum
Debt Instrument [Line Items]
Line of credit facility, unused capacity, commitment fee percentage	0.15%
2021 Credit Agreement | Maximum
Debt Instrument [Line Items]
Line of credit facility, unused capacity, commitment fee percentage	0.325%
2021 Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum
Debt Instrument [Line Items]
Basis spread on term loan	1.375%
2021 Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum
Debt Instrument [Line Items]
Basis spread on term loan	2.125%
2021 Credit Agreement | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on term loan	0.375%
2021 Credit Agreement | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on term loan	1.125%
2021 Credit Agreement | Revolving Loan
Debt Instrument [Line Items]
Credit Agreement	$ 450,000,000	$ 450,000,000
Credit facility term		5 years
Line of credit facility, unused capacity, commitment fee percentage		0.15%
Credit facility, outstanding borrowings		$ 0
Credit facility, current borrowing capacity		450,000,000.0
2021 Credit Agreement | 2021 and 2018 Term Loans
Debt Instrument [Line Items]
Principal repayments		8,400,000
2021 Credit Agreement | 2021 Term Loan
Debt Instrument [Line Items]
Carrying value of debt	150,000,000	$ 144,719,000
Term loan period		5 years
Proceeds from long term debt	$ 150,000,000
Basis spread on term loan		1.375%
Term loan combined interest rate		1.60%
Financing costs		$ 3,406,000

X

- Definition

Amount of increase (decrease) in cash. Cash is the 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. Includes effect from exchange rate changes.

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

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The average effective interest rate during the reporting period.

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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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Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

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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.

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Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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.

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