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DERIVATIVE INSTRUMENTS - Effect of Derivative Instruments Designated Cash Flow Hedges on Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Roll Forward] |  |  |  |
Balance, Beginning of Period |  |  | $ 962,306 |
Balance, End of Period | $ 1,341,905 |  | 1,341,905 |
Cash Flow |  |  |  |
Derivative Instruments, Gain (Loss) [Roll Forward] |  |  |  |
Balance, Beginning of Period | 8,511 | $ 2,479 | (4,512) | $ 1,871
Amount of Gain (Loss) Recognized in AOCI | 19,335 | (1,500) | 27,314 | (914)
Amount of Gain (Loss) Reclassified from AOCI into Earnings | 13,394 | 44 | 8,351 | (22)
Balance, End of Period | 14,452 | 935 | 14,452 | 935
Cash Flow | Interest rate swap | Interest (expense) |  |  |  |
Derivative Instruments, Gain (Loss) [Roll Forward] |  |  |  |
Balance, Beginning of Period | 16,188 | 2,479 | 592 | 1,871
Amount of Gain (Loss) Recognized in AOCI | 6,306 | (1,500) | 21,247 | (914)
Amount of Gain (Loss) Reclassified from AOCI into Earnings | 150 | 44 | (505) | (22)
Balance, End of Period | 22,344 | $ 935 | 22,344 | $ 935
Cash Flow | Cross-currency swap | Other income (expense) |  |  |  |
Derivative Instruments, Gain (Loss) [Roll Forward] |  |  |  |
Balance, Beginning of Period | (7,677) |  | (5,104) |
Amount of Gain (Loss) Recognized in AOCI | 13,029 |  | 6,067 |
Amount of Gain (Loss) Reclassified from AOCI into Earnings | 13,244 |  | 8,856 |
Balance, End of Period | $ (7,892) |  | $ (7,892) |

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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- Definition Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 + Details
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