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Summary of Significant Accounting Policies:Interest Rate Risk and Interest Rate Swaps (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Interest Rate Derivatives [Line Items] |  |
Long-term debt | $ 440,178 | $ 440,544
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 swap agreements, Liability | 2,000 |
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 and $45 million notional amount fixed at 1.007% and 1.256% [Member] | Not Designated as Hedging Instrument [Member] |  |
Interest Rate Derivatives [Line Items] |  |
Interest rate swaps, notional amount | 95,000 | $ 95,000
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 - $45 million notional amount fixed at 1.256% [Member] | Not Designated as Hedging Instrument [Member] |  |
Interest Rate Derivatives [Line Items] |  |
Interest rate swaps, notional amount | $ 45,000 |
Interest rate swaps, fixed interest rate | 1.256% |
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% |
Interest Rate Swap - $45 million notional amount fixed at 0.431% [Member] | Not Designated as Hedging Instrument [Member] |  |
Interest Rate Derivatives [Line Items] |  |
Interest rate swaps, notional amount | $ 45,000 |
Interest rate swaps, forward interest rate | 0.431% |
Term Loans Due 2024 and 2026 [Member] |  |
Interest Rate Derivatives [Line Items] |  |
Long-term debt | $ 95,000 |

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