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Long-Term Debt - Archrock Credit Facility (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 26, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Line of Credit Facility |  |  |  |  |  |
Repayments of long-term debt |  |  |  | $ 343,636,000 | $ 970,000,000 |
Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Commitment fee amount |  | $ 600,000 | $ 500,000 | 1,100,000 | 900,000 |
Revolving Credit Facility | Partnership Credit Facility |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Repayments of long-term debt | $ 63,200,000 |  |  |  |  |
Letter of credit outstanding | $ 15,400,000 | $ 15,400,000.0 |  | 15,400,000.0 |  |
Debt extinguishment costs |  |  |  | 2,500,000 |  |
Revolving Credit Facility | Credit Facility |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Debt instrument weighted average interest rate (percent) |  |  |  |  |  | 3.30%
Commitment fee amount |  |  | $ 200,000 | $ 200,000 | $ 300,000 |

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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=114001942&loc=d3e12355-112629 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114001942&loc=d3e12317-112629 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Amount of the fee for available but unused credit capacity under the credit facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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