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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loss on Debt Extinguishment (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 | May 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 15, 2016 | Nov. 10, 2016 | Nov. 04, 2015
Impairment of long-lived assets |  |  |  |  |  |  |
Loss on debt extinguishment | $ 4,533 |  |  |  |  |  |
$400 Million Credit Facility | Secured Debt |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 400,000 | $ 400,000 |  | $ 400,000 |
$98 Million Credit Facility | Line of Credit Facility |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 98,000 |  | $ 98,000 |  | $ 98,000
$460 Million Credit Facility | Secured Debt |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |
Maximum borrowing capacity | $ 460,000 | $ 460,000 |  |  |  |  |

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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 + Details
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