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Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2019
Investments All Other Investments [Abstract] |
Summary of Investments | The following table summarizes activities related to these investments for the six months ended June 30, 2019 and the twelve months ended December 31, 2018 (in thousands):
|  | Six Months Ended |  |  | Twelve Months Ended |
|  | June 30, 2019 |  |  | December 31, 2018 |
Fair value at beginning of period |  | $ | 56,556 |  |  | $ | 51,101 |
Purchases |  |  | 13,920 |  |  |  | 18,426 |
Redemptions |  |  | (311 | ) |  |  | (1,793 | )
Maturities |  |  | (10,245 | ) |  |  | (10,445 | )
Decrease in bond premium |  |  | (357 | ) |  |  | (377 | )
Fair market value adjustment |  |  | 1,144 |  |  |  | (356 | )
Fair value at end of period |  | $ | 60,707 |  |  | $ | 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 June 30, 2019 and December 31, 2018 (in thousands):
|  | June 30, 2019
|  | Notional |  |  | Fair |  |  |
|  | Amount |  |  | Value |  |  | Balance Sheet Location
Interest rate swaps |  | $ | 70,000 |  |  | $ | (427 | ) |  | Other non-current liability
|  | 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 swaps on the accompanying Consolidated Statements of Comprehensive Income for the three and six months ended June 30, 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 |
|  | June 30, |  |  | June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Interest rate swap |  | $ | (730 | ) |  | $ | 176 |  |  | $ | (134 | ) |  | $ | (87 | )
|  | Six Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Interest rate swap |  | $ | (1,157 | ) |  | $ | 626 |  |  | $ | (273 | ) |  | $ | (125 | )

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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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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