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Summary of Significant Accounting Policies:Interest Rate Risk and Interest Rate Swaps (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended		12 Months Ended
	Jul. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2016	Jun. 30, 2020	Dec. 31, 2019
Interest Rate Derivatives [Line Items]
Long-term debt		$ 443,583				$ 440,544
Payments of long-term debt, including revolving credit facility		405,774	$ 5,500
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Level 2 [Member] | Other Noncurrent Liabilities [Member]
Interest Rate Derivatives [Line Items]
Fair value of interest rate swap agreements, Liability		800
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Level 2 [Member] | Other assets [Member]
Interest Rate Derivatives [Line Items]
Fair value of interest rate swap agreements, Asset						$ 800
Interest Rate Swap - $50 million notional amount fixed at 1.007% [Member] | Not Designated as Hedging Instrument [Member]
Interest Rate Derivatives [Line Items]
Interest rate swaps, notional amount		$ 50,000
Interest rate swaps, fixed interest rate		1.007%
Interest Rate Swap - $50 million notional amount fixed at 0.39% [Member] | Not Designated as Hedging Instrument [Member]
Interest Rate Derivatives [Line Items]
Interest rate swaps, notional amount					$ 50,000
Interest rate swaps, forward interest rate					0.39%
Term Loan Due 2025 [Member]
Interest Rate Derivatives [Line Items]
Long-term debt		$ 50,000
Term Loan Due 2026 [Member]
Interest Rate Derivatives [Line Items]
Payments of long-term debt, including revolving credit facility	$ 45,000			$ 30,000
Notional Principal Amount of Liquidated Derivative Instruments		$ 45,000

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