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Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2018
Investments All Other Investments [Abstract] |
Summary of Bond Activity | The following table summarizes our bond activity for the six months ended June 30, 2018 and the twelve months ended December 31, 2017 (in thousands):
|  | Six Months Ended |  |  | Twelve Months Ended |
|  | June 30, 2018 |  |  | December 31, 2017 |
Fair value at beginning of period |  | $ | 51,101 |  |  | $ | 44,573 |
Purchases |  |  | 10,345 |  |  |  | 15,546 |
Redemptions |  |  | (1,098 | ) |  |  | (940 | )
Maturities |  |  | (6,175 | ) |  |  | (7,845 | )
Decrease in bond premium |  |  | (48 | ) |  |  | (160 | )
Fair market value adjustment |  |  | (451 | ) |  |  | (73 | )
Fair value at end of period |  | $ | 53,674 |  |  | $ | 51,101 |
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, 2018 and December 31, 2017 (in thousands):
|  | June 30, 2018
|  | Notional |  |  | Fair |  |  |
|  | Amount |  |  | Value |  |  | Balance Sheet Location
Interest rate swaps |  | $ | 70,000 |  |  | $ | 1,892 |  |  | Other non-current assets
Interest rate swaps |  | $ | 15,000 |  |  | $ | 58 |  |  | Other current assets
|  | December 31, 2017
|  | Notional |  |  | Fair |  |  |
|  | Amount |  |  | Value |  |  | Balance Sheet Location
Interest rate swaps |  | $ | 55,000 |  |  | $ | 1,055 |  |  | Other non-current assets
Interest rate swaps |  | $ | 15,000 |  |  | $ | 76 |  |  | Other current assets
Under the terms of the interest rate swaps, we pay interest at a fixed rate of interest plus applicable margin as stated in the agreement, and receive interest that varies with the one-month LIBOR. The notional value, fixed rate of interest and expiration date of each interest rate swap as of June 30, 2018 is (i) $15 million – 1.155%, (ii) $25 million – 1.300% - October 2020, (iii) $10 million – 1.120% - February 2021, (iv) $20 million – 1.770% - May 2022, and (v) $15 million – 2.64% - June 2023. Refer to Note 10, Fair Value Measurements, for additional disclosures regarding fair value measurements.
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, 2018 and 2017 (in thousands):
|  | Gain (Loss) Recognized in AOCL, net of tax |  |  | (Loss) Gain Reclassified from AOCL into Expense |
|  | Three Months Ended |  |  | Three Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Interest rate swap |  | $ | 176 |  |  | $ | (22 | ) |  | $ | (87 | ) |  | $ | 42 |
|  | Six Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Interest rate swap |  | $ | 626 |  |  | $ | 71 |  |  | $ | (125 | ) |  | $ | 100 |

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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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