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Debt:Term Loan (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jul. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2016	Mar. 30, 2016
Debt Instrument [Line Items]
Repayments of Long-term Debt		$ 405,774	$ 5,500	$ 7,500
Term Loan Due 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 75,000
Repayments of Long-term Debt	$ 45,000				$ 30,000
Debt Instrument, Interest Rate During Period		2.82%
Debt Instrument, Interest Rate During Period With Patronage Credits		1.80%
Term Loan Due 2026 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate		1.875%
Term Loan Due 2026 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate		2.125%
Term Loan Due 2026 [Member] | Base Rate [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate		0.875%
Term Loan Due 2026 [Member] | Base Rate [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate		1.125%

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- Definition

The average effective interest rate during the reporting period, which includes the expected patronage credits.

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

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Face (par) amount of debt instrument at time of issuance.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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