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Accumulated Other Comprehensive Income (Loss) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) The changes in accumulated other comprehensive income (loss) by component for the three months ended March 31, 2018 are as follows:
| Gains and Losses on Cash Flow Hedges |  | Defined Benefit Pension Plan |  | Total Accumulated Other Comprehensive Income (Loss)
| (In thousands)
Balance at December 31, 2017 | $ | 1,750 |  |  | $ | (443 | ) |  | $ | 1,307 |
Other comprehensive income (loss) before reclassifications (1) | 2,691 |  |  | — |  |  | 2,691 |
Amounts reclassified out of accumulated other comprehensive income (loss) (2) | 223 |  |  | — |  |  | 223 |
Net current-period other comprehensive income (loss) | 2,914 |  |  | — |  |  | 2,914 |
Balance at March 31, 2018 | $ | 4,664 |  |  | $ | (443 | ) |  | $ | 4,221 |
(1) | Net of tax expense of $1,046.
(2) | Net of tax expense of $84.
See the heading “Derivative Instruments and Hedging Activities” in Note 6, “Long-Term Debt,” for further discussion of Sonic’s cash flow hedges. For further discussion of Sonic’s defined benefit pension plan, see Note 10, “Employee Benefit Plans,” to the consolidated financial statements in Sonic’s Annual Report on Form 10-K for the year ended December 31, 2017.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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