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DEBT - Fixed-rate and variable-rate debt (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt |  |
Fixed-rate debt | $ 554,461 | $ 386,313
Fixed rate debt, percentage | 58.00% | 44.00%
Variable-rate debt | $ 401,352 | $ 486,796
Variable-rate debt, percentage | 42.00% | 56.00%
Debt, gross | $ 955,813 | $ 873,109
Carrying Value |  |
Debt |  |
Fixed-rate debt | 279,461 | 311,313
Level 2 | Fair Value |  |
Debt |  |
Fixed-rate debt | $ 276,635 | $ 310,535

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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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