Intangible Assets (Components of Intangible Assets) (Details) - USD ($) $ in Thousands |
Sep. 30, 2017 |
Dec. 31, 2016 |
Sep. 30, 2016 |
Dec. 31, 2015 |
---|---|---|---|---|
Finite-Lived Intangible Assets [Line Items] | ||||
Accumulated amortization | $ 99,063 | $ 53,483 | ||
Goodwill | 1,674 | 1,674 | $ 3,626 | $ 3,647 |
Total intangible assets | 211,786 | 245,529 | ||
In-place Leases | ||||
Finite-Lived Intangible Assets [Line Items] | ||||
Finite-lived intangible assets, net | 158,395 | 185,251 | ||
Accumulated amortization | 85,806 | 46,899 | ||
Above-market Tenant Leases | ||||
Finite-Lived Intangible Assets [Line Items] | ||||
Finite-lived intangible assets, net | 33,580 | 40,260 | ||
Accumulated amortization | 12,981 | 6,515 | ||
Below-market Ground Lease | ||||
Finite-Lived Intangible Assets [Line Items] | ||||
Finite-lived intangible assets, net | 18,137 | 18,344 | ||
Accumulated amortization | $ 276 | $ 69 |