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Derivatives (Tables) | 3 Months Ended
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Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of interest rate swaps | At March 31, 2018, the Partnership was a party to the following interest rate swaps, which were entered into to offset changes in expected cash flows due to fluctuations in the associated variable interest rates:
Expiration Date |  | Notional Value (in millions)
May 2019 |  | $ | 100.0 |
May 2020 |  | 100.0 |
March 2022 |  | 300.0 |
|  | $ | 500.0 |
Effect of derivative instruments on consolidated financial position | The following tables present the effect of derivative instruments on our consolidated financial position and results of operations (in thousands):
|  |  | Fair Value Asset (Liability)
| Balance Sheet Location |  | March 31, 2018 |  | December 31, 2017
Derivatives designated as hedging instruments: |  |  |  |  |
Interest rate swaps | Other current assets |  | $ | 1,646 |  |  | $ | 186 |
Interest rate swaps | Other long-term assets |  | 8,164 |  |  | 4,490 |
Interest rate swaps | Accrued liabilities |  | — |  |  | (134 | )
Total derivatives |  |  | $ | 9,810 |  |  | $ | 4,542 |
Effect of derivative instruments on results of operations |
| Pre-tax Gain Recognized in Other Comprehensive Income (Loss) on Derivatives |  | Location of Pre-tax Loss Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) |  | Pre-tax Loss Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss)
Derivatives designated as cash flow hedges: |  |  |  |  |
Interest rate swaps |  |  |  |  |
Three months ended March 31, 2018 | $ | 4,696 |  |  | Interest expense |  | $ | (474 | )
Three months ended March 31, 2017 | 699 |  |  | Interest expense |  | (1,013 | )
| Location and Amount of Gain (Loss) Recognized in Income on Cash Flow Hedging Relationships
| Three Months Ended March 31, 2018
| Interest Expense
Total amounts of income and expense line items presented in the statement of operations in which the effects of cash flow hedges are recorded | $ | 22,547 |
Interest Contracts: |
Amount of loss reclassified from accumulated other comprehensive income into income | $ | (54 | )
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring | $ | — |

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- Definition Tabular disclosure of credit derivatives which includes information by sellers of credit derivatives, about each credit derivative, or each group of similar credit derivatives, including (a) the nature of the credit derivative - its term, how it arose, the events or circumstances that would require the seller to perform under the credit derivative, and the current status of the payment/performance risk of the credit derivative; (b) the maximum potential amount of future payments (undiscounted) the seller could be required to make under the credit derivative; (c) the current fair value of the credit derivative; and (d) the nature of any recourse provisions under the credit derivative, and any assets held either as collateral or by third parties. A credit derivative is a derivative instrument (1) in which one or more of its underlyings are related to the credit risk of a specified entity (or a group of entities) or an index based on the credit risk of a group of entities and (2) that exposes the seller to potential loss from credit-risk-related events specified in the contract. Examples of credit derivatives within the scope of this paragraph include, but are not limited to, credit default swaps, credit spread options, and credit index products; also includes a hybrid instrument that has an embedded credit derivative (for example, but not limited to, a credit-linked note). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4L -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5708777-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5708775-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5708773-113959 + Details
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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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