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Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2019
Investments All Other Investments [Abstract] |
Summary of Bond Activity | The following table summarizes our bond activity for the three months ended March 31, 2019 and the twelve months ended December 31, 2018 (in thousands):
|  | Three Months Ended |  |  | Twelve Months Ended |
|  | March 31, 2019 |  |  | December 31, 2018 |
Fair value at beginning of period |  | $ | 56,556 |  |  | $ | 51,101 |
Purchases |  |  | 9,470 |  |  |  | 18,426 |
Redemptions |  |  | — |  |  |  | (1,793 | )
Maturities and calls |  |  | (6,865 | ) |  |  | (10,445 | )
Change in bond premium |  |  | (171 | ) |  |  | (377 | )
Fair market value adjustment |  |  | 697 |  |  |  | (356 | )
Fair value at end of period |  | $ | 59,687 |  |  | $ | 56,556 |
Summary of Outstanding Interest Rate Swaps | The following table summarizes our outstanding interest rate swaps and their classification in the accompanying Consolidated Balance Sheets at March 31, 2019 and December 31, 2018 (in thousands):
|  | March 31, 2019
|  | Notional |  |  | Fair |  |  |
|  | Amount |  |  | Value |  |  | Balance Sheet Location
Interest rate swaps |  | $ | 70,000 |  |  | $ | 533 |  |  | Other non-current assets
|  | December 31, 2018
|  | Notional |  |  | Fair |  |  |
|  | Amount |  |  | Value |  |  | Balance Sheet Location
Interest rate swaps |  | $ | 70,000 |  |  | $ | 1,096 |  |  | Other non-current assets
Summary of Effects of Interest Rate Swap | The following table summarizes the effects of the interest rate swap on our accompanying Consolidated Statements of Comprehensive Income for the three months ended March 31, 2019 and 2018 (in thousands):
|  | (Loss) Gain Recognized in AOCL, Net of Tax |  |  | Loss Reclassified from AOCL into Expense |
|  | Three Months Ended |  |  | Three Months Ended |
|  | March 31, |  |  | March 31, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Interest rate swap |  | $ | (427 | ) |  | $ | 450 |  |  | $ | (139 | ) |  | $ | (38 | )

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- Definition Tabular disclosure of interest rate derivatives, including, but not limited to, the fair value of the derivatives, statement of financial position location, and statement of financial performance location of these instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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