Intangible Leases and Goodwill Intangible Asset and Liabilities Outstanding (Details) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
---|---|---|
Acquired Finite-Lived Intangible Assets [Line Items] | ||
Acquired below-market lease liabilities | $ (118,012) | $ (63,287) |
Accumulated amortization, intangible liabilities | 27,388 | 20,255 |
Goodwill | 29,085 | 0 |
Management Contracts | ||
Acquired Finite-Lived Intangible Assets [Line Items] | ||
Acquired intangible assets | 58,000 | 0 |
Accumulated amortization, intangible assets | (2,900) | 0 |
Acquired In-place Leases | ||
Acquired Finite-Lived Intangible Assets [Line Items] | ||
Acquired intangible assets | 313,432 | 212,916 |
Accumulated amortization, intangible assets | (123,314) | (92,347) |
Acquired Above-market Leases | ||
Acquired Finite-Lived Intangible Assets [Line Items] | ||
Acquired intangible assets | 53,524 | 42,009 |
Accumulated amortization, intangible assets | $ (24,631) | $ (19,443) |