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Investments | 6 Months Ended
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Jun. 30, 2014
Investments [Abstract] |
Investments | Investments Certificates of Deposit – We held $16.1 million and $10.7 million in certificates of deposit at June 30, 2014, and December 31, 2013, respectively. At June 30, 2014, the certificates of deposit bear interest ranging from 0.20% to 0.90% per annum and have various maturities ranging from less than one month to approximately 24 months. Investments Held to Maturity – Our investments held to maturity are comprised of $24.8 million of corporate notes and bonds with original maturities ranging from less than one month to approximately 24 months. The investments have moderate risk with S&P ratings ranging from AA+ to BBB-. We record the amortized cost basis and accrued interest of the corporate notes and bonds in the Consolidated Balance Sheets. We record the interest and amortization of bond premium to interest income in the Consolidated Statements of Income. The following summarizes the amortized cost and estimated fair value of our investments held to maturity as of June 30, 2014 and December 31, 2013:
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized (Loss) |  | Fair Value
June 30, 2014: | (in thousands)
Current assets: |  |  |  |  |  |  |
Investments held to maturity | $ | 19,097 |  |  | $ | 30 |  |  | $ | — |  |  | $ | 19,127 |
Non current assets: |  |  |  |  |  |  |  |  |  |  |
Investments held to maturity | 5,682 |  |  | — |  |  | (11 | ) |  | 5,671 |
Total | $ | 24,779 |  |  | $ | 30 |  |  | $ | (11 | ) |  | $ | 24,798 |
December 31, 2013: |  |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |
Investments held to maturity | $ | 16,040 |  |  | $ | 11 |  |  | $ | — |  |  | $ | 16,051 |
Non current assets: |  |  |  |  |  |  |  |  |  |  |
Investments held to maturity | 10,981 |  |  | 7 |  |  | — |  |  | 10,988 |
Total | $ | 27,021 |  |  | $ | 18 |  |  | $ | — |  |  | $ | 27,039 |

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- Definition The entire disclosure for investment holdings. This includes the long positions of investments for the entity. It contains investments in affiliated and unaffiliated issuers. The investments include securities and non securities (i.e. commodities and futures contracts). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611282-123010 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611133-123010 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611225-123010 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 13 -Article 12 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Article 12 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Article 12 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611322-123010 + Details
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