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Credit Agreement (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Schedule of Credit Agreement | Selected details of our credit agreement as of and for the years ended December 31, 2017 and 2016 were as follows (dollars in thousands):
|  | As of December 31, |
|  | 2017 |  |  | 2016 |
Credit Agreement: |  |  |  |  |  |  |  |
Credit facility remaining availability |  | $ | 89,930 |  |  | $ | 86,403 |
Outstanding letters of credit (1)(2) |  | $ | 5,070 |  |  | $ | 8,597 |
Availability of additional letters of credit (3) |  | $ | 54,930 |  |  | $ | 51,403 |
Weighted average daily revolving credit borrowings for the year ended |  | $ | - |  |  | $ | 19 |
Weighted average annual interest rate |  |  | 0.00 | % |  |  | 1.93 | %
Commitment fee rate |  |  | 0.25 | % |  |  | 0.25 | %
Letter of credit fee rate (4) |  |  | 0.75 | % |  |  | 0.75 | %
(1) | Represents letters of credit which are fully collateralized with $5.1 million and $8.6 million of restricted short-term investments as of December 31, 2017 and 2016, respectively.
(2) | As of December 31, 2017 and 2016, outstanding letters of credit not related to the Credit Agreement totaled $0.8 million and $1.4 million, respectively, which amount is fully collateralized with restricted cash, which is in addition to the $5.1 million and $8.6 million, respectively, referenced in this Note 10.
(3) | The letters of credit sublimit of $60.0 million under the Credit Agreement is part of, not in addition to, the $95.0 million aggregate commitments.
(4) | Certain outstanding letters of credit in the above table originating after October 31, 2014 carry a fee rate of 1.50%

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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