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Derivatives | 9 Months Ended
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Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Derivatives | 8. Derivatives We are exposed to market risks associated with changes in interest rates. We use derivative instruments to minimize the risks and/or costs associated with financial activities by managing our exposure to interest rate fluctuations on a portion of our debt obligations. We do not use derivative instruments for trading or other speculative purposes. Interest Rate Risk At September 30, 2017, 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 |
May 2020 |  | 100 |
March 2022 |  | 300 |
|  | $ | 500 |
As of September 30, 2017, the weighted average effective fixed interest rate on the interest rate swaps was 1.8%. We have designated these interest rate swaps as cash flow hedging instruments so that any change in their fair values is recognized as a component of comprehensive income (loss) and is included in accumulated other comprehensive income (loss) to the extent the hedge is effective. As the swap terms substantially coincide with the hedged item and are expected to offset changes in expected cash flows due to fluctuations in the variable rate, we currently do not expect a significant amount of ineffectiveness on these hedges. We perform qua rterly calculations to determine whether the swap agreements are still effective and to calculate any ineffectiveness. We recorded $0.7 million of interest expense during the nine months ended September 30, 2017 as compared to an immaterial amount of interest expense during the nine months ended September 30, 2016 due to ineffectiveness related to interest rate swaps. We estimate that $1.1 million of deferred pre-tax losses attributable to interest rate swaps and included in our accumulated other comprehensive income (loss) at September 30, 2017, will be reclassified into earnings as interest expense at then-current values during the next twelve months as the underlying hedged transactions occur. Cash flows from derivatives designated as hedges are classified in our condensed consolidated statements of cash flows under the same category as the cash flows from the underlying assets, liabilities or anticipated transactions, unless the derivative contract contains a significant financing element; in this case, the cash settlements for these derivatives are classified as cash flows from financing activities in our condensed consolidated statements of cash flows. In August 2017, the Partnership amended the terms of certain of its interest rate swap agreements, designated as cash flow hedges against the variability of future interest payments due under the Partnership Credit Facility, with a notional value of $300.0 million. The amended terms adjusted the fixed interest rate and extended the maturity dates to March 2022. These amendments effectively created new derivative contracts and terminated the old derivative contracts. As a result, as of the amendment date, we discontinued the original cash flow hedge relationships on a prospective basis and designated the amended interest rate swaps under new cash flow hedge relationships based on the amended terms. The fair value of the interest rate swaps immediately prior to the execution of the amendments was a liability of $0.7 million. The associated amount in accumulated other comprehensive income (loss) is being amortized into interest expense over the original terms of the interest rate swaps through May 2018. 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 |  | September 30, 2017 |  | December 31, 2016
Derivatives designated as hedging instruments: |  |  |  |  |
Interest rate swaps | Other long-term assets |  | $ | 1,884 |  |  | $ | 413 |
Interest rate swaps | Accrued liabilities |  | (1,297 | ) |  | (3,226 | )
Interest rate swaps | Other long-term liabilities |  | — |  |  | (377 | )
Total derivatives |  |  | $ | 587 |  |  | $ | (3,190 | )
| Pre-tax Gain (Loss) 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 September 30, 2017 | $ | 1,919 |  |  | Interest expense |  | $ | (678 | )
Three months ended September 30, 2016 | 2,049 |  |  | Interest expense |  | (1,208 | )
Nine months ended September 30, 2017 | 2,282 |  |  | Interest expense |  | (2,521 | )
Nine months ended September 30, 2016 | (7,401 | ) |  | Interest expense |  | (3,483 | )
The counterparties to the derivative agreements are major financial institutions. We monitor the credit quality of these financial institutions and do not expect non-performance by any counterparty, although such non-performance could have a material adverse effect on us. The Partnership has no specific collateral posted for its derivative instruments.

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- Definition The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -URI http://asc.fasb.org/topic&trid=2229140 + Details
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