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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