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Summary of Significant Accounting Policies:Interest Rate Risk and Interest Rate Swaps (Details) - USD ($) $ in Thousands | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2018 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2016 | Feb. 16, 2016
Interest Rate Derivatives [Line Items] |  |  |  |  |
Long-term debt |  | $ 439,707 | $ 439,428 |  |
Term Loans Due 2022 and 2026 [Member] |  |  |  |  |
Interest Rate Derivatives [Line Items] |  |  |  |  |
Long-term debt |  | 95,000 |  |  |
Term Loan Due 2026 [Member] |  |  |  |  |
Interest Rate Derivatives [Line Items] |  |  |  |  |
Liquidation of Derivative Notional Amount | $ 30,000 |  |  |  |
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 |  | 2,800 | 3,800 |  |
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 - $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 Swap - $75 million notional amount fixed at 1.256% [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Interest Rate Derivatives [Line Items] |  |  |  |  |
Interest rate swaps, notional amount |  |  |  | $ 75,000 |
Interest rate swaps, fixed interest rate |  |  |  | 1.256% |
Interest rate swap – $50 and $75 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 |  |

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