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Investments | 6 Months Ended
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Jun. 30, 2021
Investments |
Investments | 5. Investments Investments, at fair value During the first six months of 2021, the Company invested $30.1 million of cash in highly liquid fixed income funds. The Company classifies these investments as trading securities and reports them at fair value. There were no significant unrealized gains or losses on these investments in the first half of 2021. The fair value measurements of these investments are based on quoted market prices in active markets, and thus represent a level 1 valuation as defined by ASC 820. Marketable securities, at amortized cost The Company also invests in marketable securities. As noted in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020, all of the Company’s marketable securities are classified as held-to-maturity securities and reported at amortized cost pursuant to ASC Topic 320, Investments - Debt and Equity Securities, as the Company has the intent and ability to hold all investments to maturity. Below is a summary of the amortized cost and estimated market values of the Company's marketable securities as of June 30, 2021, and December 31, 2020. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021 | ​ | December 31, 2020
​ | ​ | Amortized | ​ | Market | ​ | Amortized | ​ | Market
​ |  | Cost |  | Value |  | Cost |  | Value
​ | ​ | (Dollars in thousands)
Municipal bonds: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Current | ​ | $ | 1,493 | ​ | $ | 1,505 | ​ | $ | 2,215 | ​ | $ | 2,249
Due from one through five years | ​ |  | 6,666 | ​ |  | 7,003 | ​ |  | 7,420 | ​ |  | 7,830
Due from six through ten years | ​ |  | 2,635 | ​ |  | 3,106 | ​ |  | 3,057 | ​ |  | 3,608
Due from eleven through twenty years | ​ |  | 1,611 | ​ |  | 1,764 | ​ |  | 2,323 | ​ |  | 2,547
Total | ​ | $ | 12,405 | ​ | $ | 13,378 | ​ | $ | 15,015 | ​ | $ | 16,234
​ The unrealized gains and losses on marketable securities at June 30, 2021, and at December 31, 2020, were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021 | ​ | December 31, 2020
​ |  | Unrealized |  | Unrealized |  | Unrealized |  | Unrealized
​ |  | Gains |  | Losses |  | Gains |  | Losses
​ | ​ | (Dollars in thousands)
Municipal bonds | ​ | $ | 973 | ​ | $ | — | ​ | $ | 1,219 | ​ | $ | —
​ The estimated market values provided are level 2 valuations as defined by ASC 820, Fair Value Measurements and Disclosures (“ASC 820”). The Company reviewed its portfolio of investments as of June 30, 2021, and determined that no other-than-temporary market value impairment exists.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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