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Goodwill, Deferred Leasing Costs and Other Intangibles - Remaining Terms of Acquired Leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Above-market lease values $ 6,862 $ 15,319 $ (2,045)
Below-market lease values 35,919 40,079 7,089
Net increase (decrease) to rental income 5,390 14,626 (1,569)
Above-market ground lease obligations (925) (752) 482
Below-market ground lease obligations 669 854 (6)
Net increase (decrease) to ground rent expense (256) 102 476
Amortization expense 94,356 158,657 58,759
Above-market lease values      
Finite-Lived Intangible Assets [Line Items]      
Above-market lease values (29,444) (25,235) (8,658)
Lease incentives      
Finite-Lived Intangible Assets [Line Items]      
Above-market lease values (1,085) (218) 0
In-place lease values      
Finite-Lived Intangible Assets [Line Items]      
Amortization expense 45,718 74,560 30,193
Deferred leasing costs      
Finite-Lived Intangible Assets [Line Items]      
Amortization expense 17,749 19,046 13,777
Trade name      
Finite-Lived Intangible Assets [Line Items]      
Amortization expense 1,606 3,682 0
Investment management contracts      
Finite-Lived Intangible Assets [Line Items]      
Amortization expense 22,386 38,640 11,446
Customer relationships      
Finite-Lived Intangible Assets [Line Items]      
Amortization expense 4,606 12,514 3,343
Other      
Finite-Lived Intangible Assets [Line Items]      
Amortization expense $ 2,291 $ 10,215 $ 0