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Committed Lines of Credit (Tables) | 3 Months Ended
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Mar. 31, 2017
Short-term Debt [Abstract] |
Schedule of Line of Credit Facilities [Table Text Block] | Borrowings outstanding and interest rates of borrowings (excluding letters of credit) under the Company’s revolving committed line of credit were as follows as of March 31, 2017 and December 31, 2016 (dollars in thousands):
| March 31, |  | December 31,
| 2017 |  | 2016
Borrowings outstanding at end of period | $ | 105,000 |  |  | $ | 120,000 |
Letters of credit outstanding at end of period | $ | 42,053 |  |  | $ | 34,353 |
Average interest rates at end of period | 1.74 | % |  | 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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