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Derivatives, Net - Summary of Amounts Recognized on Consolidated Statements of Operations Related to Company's Derivatives (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on derivative instruments - unrealized |  |  |  |  |  |  |  |  | $ 29,345 | $ (11,523) | $ 2,608
Gain (loss) on derivative instruments - realized |  |  |  |  |  |  |  |  | 0 | (289) | 28,552
Gain (loss) on derivative instruments | $ 10,261 | $ 6,291 | $ 33,538 | $ (11,032) | $ (1,265) | $ (7,481) | $ (7,389) | $ (3,045) | 39,058 | (19,180) | 31,160
Total |  |  |  |  |  |  |  |  | 39,058 | (19,767) | 31,160
Forward Currency Contract [Member] | Gain (Loss) on Derivative Instruments [Member] |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on derivative instruments - unrealized |  |  |  |  |  |  |  |  | 29,345 | (11,527) | 2,665
Gain (loss) on derivative instruments - realized |  |  |  |  |  |  |  |  | 9,713 | (7,657) | 28,552
Forward Currency Contract [Member] | Loss From Unconsolidated Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on derivative instruments - realized |  |  |  |  |  |  |  |  | 0 | (587) | 0
Interest Rate Cap [Member] | Gain (Loss) on Derivative Instruments [Member] |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on derivative instruments - unrealized |  |  |  |  |  |  |  |  | 0 | 4 | (57)
Notional amount | $ 34,900 |  |  |  | $ 40,200 |  |  |  | $ 34,900 | $ 40,200 | $ 45,500

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- Definition Gain (Loss) On Derivative Instruments, Net, Pretax, Including (Income) Loss From Unconsolidated Joint Venture + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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