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Summary of Significant Accounting Policies:Interest Rate Risk and Interest Rate Swaps (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Interest Rate Derivatives [Line Items] |  |
Long-term debt | $ 444,001 | $ 443,792
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 | 900 |
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 | 400 | $ 600
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% |
ABL Term Loan Due 2025 |  |
Interest Rate Derivatives [Line Items] |  |
Long-term debt | $ 50,000 |

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