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Committed Lines of Credit (Tables) | 6 Months Ended
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Jun. 30, 2019
Short-term Debt [Abstract] |
Schedule of Line of Credit Facilities [Table Text Block] | outstanding and interest rates of borrowings (excluding letters of credit) under the Company’s revolving committed line of credit were as follows as of June 30, 2019 and December 31, 2018 (dollars in thousands):
| June 30, |  | December 31,
| 2019 |  | 2018
Balance outstanding at end of period (1) | $ | 169,000 |  |  | $ | 190,000 |
Letters of credit outstanding at end of period | $ | 18,603 |  |  | $ | 10,503 |
Average interest rate at end of period | 3.26 | % |  | 3.18 | %

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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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