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Credit Agreement (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Schedule of Credit Agreement | Selected details of our applicable credit agreement as of and for the years ended December 31, 2018 and 2017 were as follows (dollars in thousands):
|  | As of December 31, |
|  | 2018 |  |  | 2017 (1) |
Credit Agreements: |  |  |  |  |  |  |  |
Credit facility remaining availability |  | $ | 47,782 |  |  | $ | 89,930 |
Outstanding letters of credit (2)(3) |  | $ | 2,218 |  |  | $ | 5,070 |
Availability of additional letters of credit (4) |  | $ | 22,782 |  |  | $ | 54,930 |
Weighted average daily revolving credit borrowings for the year ended |  | $ | - |  |  | $ | - |
Weighted average annual interest rate |  |  | 0.00 | % |  |  | 0.00 | %
Commitment fee rate |  |  | 0.30 | % |  |  | 0.25 | %
Letter of credit fee rate |  |  | 1.25 | % |  |  | 0.75 | %
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(1) | Amounts listed as of and for the year ended December 31, 2017 relate to our previous credit agreement.
(2) | As of December 31, 2017, $5.1 million of restricted short-term investments provided collateral for our letters of credit.
(3) | As of December 31, 2018 and 2017, outstanding letters of credit not related to the credit agreements totaled $0.3 million and $0.8 million, respectively, which amounts are fully collateralized with restricted cash, which is in addition to the $5.1 million referenced in this Note 11 as of December 31, 2017.
(4) | The letters of credit sublimit of $25.0 million and $60.0 million as of December 31, 2018 and 2017, respectively, under the credit agreements is part of, not in addition to, the $50.0 million and $95.0 million aggregate commitments as of December 31, 2018 and 2017, respectively.

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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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