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DEBT - Interest Rates (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Interest rates on debt |  |  |  |
Effective Interest Rate (as a percent) | 6.25% | 5.27% | 6.04% | 5.14%
Minimum |  |  |  |
Interest rates on debt |  |  |  |
Range of interest rates (excluding unused commitment fees) | 4.06% | 3.50% | 3.83% | 3.36%
Maximum |  |  |  |
Interest rates on debt |  |  |  |
Range of interest rates (excluding unused commitment fees) | 8.43% | 7.42% | 8.43% | 7.42%

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- Definition The average effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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