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Long-Term Debt - The Partnership Asset-Based Revolving Credit Facility (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Apr. 26, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Line of Credit Facility |  |  |  |  |  |  |  |  |
Payments for debt issuance costs |  |  |  |  | $ 3,332,000 | $ 14,855,000 |  |  |
Loss on extinguishment of debt |  | $ 0 | $ 0 |  | $ 2,450,000 | 291,000 |  |  |
Partnership’s 6% senior notes due April 2021 | Senior Notes |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 6.00% |  |  | 6.00% |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Commitment fee amount |  |  |  |  | $ 1,700,000 | $ 1,500,000 |  |  |
Revolving Credit Facility | Archrock Partners, L.P |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Undrawn capacity under revolving credit facility |  | $ 408,100,000 |  |  | 408,100,000 |  |  |  |
Revolving Credit Facility | Archrock Partners, L.P | Maximum |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Undrawn capacity under revolving credit facility |  | 324,000,000 |  |  | $ 324,000,000 |  |  |  |
Revolving Credit Facility | Partnership Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  | 5 years |  |  |  |
Revolving credit facility borrowing capacity |  | 1,250,000,000 |  |  | $ 1,250,000,000 |  | $ 1,250,000,000 | $ 1,100,000,000.0 |
Payments for debt issuance costs | $ 14,900,000 |  |  | $ 3,300,000 |  |  |  |  |
Letter of credit outstanding |  | 15,400,000.0 |  |  | $ 15,400,000.0 |  |  |  |
Revolving Credit Facility | Partnership Credit Facility | Base rate |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Debt instrument, variable rate (percentage) |  |  |  |  | 3.20% |  |  |  |
Revolving Credit Facility | Former facility |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Amortized deferred financing cost | 600,000 |  |  |  |  |  |  |  |
Loss on extinguishment of debt | $ 300,000 |  |  |  |  |  |  |  |
Revolving Credit Facility | Partnership Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Commitment fee amount |  | $ 600,000 |  |  |  |  |  |  |
Letter of Credit | Partnership Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Revolving credit facility borrowing capacity |  |  |  |  |  |  | $ 50,000,000 | $ 25,000,000 |
Line of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Debt instrument weighted average interest rate (percent) |  | 5.50% |  |  | 5.50% |  |  |  | 4.80%

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