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.

No definition available.

Debt - Credit Agreement (Details Textual) - USD ($)		9 Months Ended		12 Months Ended
Debt - Credit Agreement (Details Textual) - USD ($)	Sep. 13, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Carrying value of debt		$ 375,475,000		$ 351,217,000
Proceeds from long term debt		150,000,000
Principal repayments		126,563,000	$ 7,500,000
Net increase of available cash	$ 30,000,000
Payments of deferred financing costs	3,000,000.0	3,000,000
Loss on extinguishment of debt		(132,000)
2021 Credit Agreement
Debt Instrument [Line Items]
Credit Agreement	600,000,000
Financing costs		$ 3,700,000
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 Term Loan
Debt Instrument [Line Items]
Carrying value of debt	150,000,000	$ 146,405,000
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		1.51%
Financing costs		$ 3,595,000
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
2018 Credit Agreement \| 2018 Term Loan
Debt Instrument [Line Items]
Carrying value of debt				$ 125,408,000
Principal repayments		$ 6,600,000
Basis spread on term loan		1.50%
Term loan combined interest rate		1.51%		1.75%
Financing costs				$ 1,155,000