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Fair Value (Tables) | 9 Months Ended
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Sep. 30, 2016
Fair Value Disclosures [Abstract] |
Assets and Liabilities Measured at Fair Value | The following table presents the Company’s assets and liabilities that are measured at fair value and the related hierarchy levels as of December 31, 2015:
|  |  | Fair Value Measurements at Reporting Date Using
| December 31, 2015 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |
Mortgage-backed securities | $ | 650 |  |  | $ | — |  |  | $ | 650 |  |  | $ | — |
Asset-backed securities | 848 |  |  | — |  |  | 848 |  |  | — |
Municipal bonds | 398 |  |  | — |  |  | 398 |  |  | — |
Fixed-income mutual fund | 16,666 |  |  | 16,666 |  |  | — |  |  | — |
Total available-for-sale securities | $ | 18,562 |  |  | $ | 16,666 |  |  | $ | 1,896 |  |  | $ | — |
Executive deferred compensation plan trust (a) | $ | 5,655 |  |  | $ | 5,655 |  |  | $ | — |  |  | $ | — |
Fuel price derivatives – unleaded fuel (b) | $ | 3,083 |  |  | $ | — |  |  | $ | 3,083 |  |  | $ | — |
Fuel price derivatives – diesel (b) | 1,924 |  |  | — |  |  | — |  |  | 1,924 |
Total fuel price derivatives | $ | 5,007 |  |  | $ | — |  |  | $ | 3,083 |  |  | $ | 1,924 |
Liabilities: |  |  |  |  |  |  |
Foreign currency swaps (c) | $ | 90 |  |  | $ | — |  |  | $ | 90 |  |  | $ | — |
(a) | The fair value of these instruments is recorded in Other assets.
(b) | The balance sheet presentation combines unleaded fuel and diesel fuel positions.
(c) | The fair value of these instruments is recorded in Accounts payable.
The following table presents the Company’s assets that are measured at fair value and the related hierarchy levels as of September 30, 2016:
|  |  | Fair Value Measurements at Reporting Date Using
| September 30, 2016 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |
Mortgage-backed securities | $ | 499 |  |  | $ | — |  |  | $ | 499 |  |  | $ | — |
Asset-backed securities | 688 |  |  | — |  |  | 688 |  |  | — |
Municipal bonds | 708 |  |  | — |  |  | 708 |  |  | — |
Fixed-income mutual fund | 22,265 |  |  | 22,265 |  |  | — |  |  | — |
Total available-for-sale securities | $ | 24,160 |  |  | $ | 22,265 |  |  | $ | 1,895 |  |  | $ | — |
Executive deferred compensation plan trust (a) | $ | 5,716 |  |  | $ | 5,716 |  |  | $ | — |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Foreign currency swaps (b) | $ | 9 |  |  | $ | — |  |  | $ | 9 |  |  | $ | — |
(a) | The fair value of these instruments is recorded in Other assets.
(b) | The fair value of these instruments is recorded in Accounts payable.
Reconciliation of Beginning and Ending Balances for Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs | The following table presents a reconciliation of the beginning and ending balances for fuel-price derivative assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the nine months ended:
|  | September 30, 2016 |  | September 30, 2015
|  | Fuel Price Derivatives – Diesel |  | Fuel Price Derivatives – Diesel
Beginning balance, January 1, 2016 and 2015, respectively |  | $ | 1,924 |  |  | $ | 11,848 |
Total (losses) and gains – realized/unrealized |  |  |  |
Included in earnings (a) |  | (1,924 | ) |  | (7,403 | )
Included in other comprehensive income |  | — |  |  | — |
Purchases, issuances and settlements |  | — |  |  | — |
Transfers (in)/out of Level 3 |  | — |  |  | — |
Ending balance September 30, 2016 and 2015, respectively |  | $ | — |  |  | $ | 4,445 |
(a) | Gains and losses for the nine months ended September 30, 2016 and 2015 are reported in net realized and unrealized losses on fuel price derivatives on the unaudited condensed consolidated statements of income.
The following table presents a reconciliation of the beginning and ending balances for fuel-price derivative assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the three months ended September 30, 2015:
|  | Fuel Price Derivatives – Diesel
Beginning balance, July 1 2015 |  | $ | 6,078 |
Total gains and (losses) – realized/unrealized |  |
Included in earnings (a) |  | (1,633 | )
Included in other comprehensive income |  | — |
Purchases, issuances and settlements |  | — |
Transfers (in)/out of Level 3 |  | — |
Ending balance, September 30 2015 |  | $ | 4,445 |
(a) | Gains and losses for the three months ended September 30, 2015 are reported in net realized and unrealized losses on fuel price derivatives on the unaudited condensed consolidated statements of income.

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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