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Derivatives, Net - Summary of Amounts Recognized on Consolidated Statements of Operations Related to Company's Derivatives (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on derivative instruments - unrealized |  |  |  |  |  |  |  |  | $ (11,523,000) | $ 2,608,000 | $ (1,063,000)
Gain on derivative instruments - realized |  |  |  |  |  |  |  |  | (289,000) | 28,552,000 | 5,169,000
Gain (loss) on derivative instruments | $ (1,265,000) | $ (7,481,000) | $ (7,389,000) | $ (3,045,000) | $ 8,329,000 | $ 4,815,000 | $ 13,313,000 | $ 4,703,000 | (19,180,000) | 31,160,000 | 4,106,000
Total |  |  |  |  |  |  |  |  | (19,767,000) | 31,160,000 | 4,106,000
Forward Currency Contract [Member] | Gain (Loss) on Derivative Instruments [Member] |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on derivative instruments - unrealized |  |  |  |  |  |  |  |  | (11,527,000) | 2,665,000 | (853,000)
Gain on derivative instruments - realized |  |  |  |  |  |  |  |  | (7,657,000) | 28,552,000 | 5,169,000
Forward Currency Contract [Member] | Loss From Unconsolidated Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on derivative instruments - realized |  |  |  |  |  |  |  |  | (587,000) | 0 | 0
Interest Rate Cap [Member] | Gain (Loss) on Derivative Instruments [Member] |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on derivative instruments - unrealized |  |  |  |  |  |  |  |  | 4,000 | (57,000) | (210,000)
Aggregate Notional Amount | $ 40,185 |  |  |  | $ 45,475 |  |  |  | $ 40,185 | $ 45,475 | $ 49,323

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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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