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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Loss Contingencies [Line Items] |  |  |
Annual rental payments | $ 7.2 | $ 7.1 | $ 7.0
Commitments to complete construction of our ongoing capital projects and other capital expenditure requirement | $ 9.8 |  |
Minimum [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Percent of guaranty of completion and principal guaranty | 5.00% |  |
Maximum [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Percent of guaranty of completion and principal guaranty | 100.00% |  |
Debt [Member] | Mortgages [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Maximum amount of joint venture debt guaranteed by the Company | $ 19.3 |  |
Unconsolidated Properties [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Commitments to complete construction of our ongoing capital projects and other capital expenditure requirement | 4.4 |  |
Company's share of joint venture purchase commitment | $ 2.2 |  |

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