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Summary of Significant Accounting Policies Summary of Significant Accounting Policies:Interest Rate Risk and Interest Rate Swaps (Details) - USD ($) $ in Thousands | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Mar. 31, 2016 | Feb. 16, 2016
Interest Rate Derivatives [Line Items] |  |  |  |  |  |  |
Long-term debt |  | $ 438,870 |  |  | $ 438,312 |  |
Repayments of Term Debt |  | 7,500 | $ 366,400 |  |  |  |
Term Loans Due 2022 and 2026 [Member] |  |  |  |  |  |  |
Interest Rate Derivatives [Line Items] |  |  |  |  |  |  |
Long-term debt |  | 95,000 |  |  | 95,000 |  |
Debt Instrument, Face Amount |  | 125,000 |  |  |  |  |
Term Loan Due 2026 [Member] |  |  |  |  |  |  |
Interest Rate Derivatives [Line Items] |  |  |  |  |  |  |
Repayments of Term Debt | $ 30,000 |  |  | $ 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 |  | $ 6,900 |  |  | $ 4,700 |  |
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 - $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% |

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