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DEBT - Interest Rates (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 21, 2005 | Sep. 30, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Interest rates on debt |  |  |  |  |  |
Effective Interest Rate (as a percent) |  |  | 5.71% | 5.29% | 4.50% |
Letter of credit |  |  |  |  |  |
Restricted Cash and Cash Equivalents, Noncurrent |  |  | $ 315 | $ 23,233 | $ 27,426 | $ 315
Minimum |  |  |  |  |  |
Interest rates on debt |  |  |  |  |  |
Range of interest rates (excluding unused commitment fees) |  |  | 3.83% | 3.36% | 2.69% |
Maximum |  |  |  |  |  |
Interest rates on debt |  |  |  |  |  |
Range of interest rates (excluding unused commitment fees) |  |  | 8.43% | 7.82% | 7.12% |
Letter of credit |  |  |  |  |  |
Letter of credit |  |  |  |  |  |
Fee on letter of credit (as a percent) | 1.00% | 1.375% | 1.375% | 1.375% |  |
Amount of letters outstanding |  |  | $ 300 | $ 300 |  |
Restricted Cash and Cash Equivalents, Noncurrent |  |  | $ 315 | $ 315 |  |
Letter of credit | Minimum |  |  |  |  |  |
Letter of credit |  |  |  |  |  |
Notice period for cancellation of line of credit |  |  | 30 days |  |  |

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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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- Definition Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + 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(17)) -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 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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