Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Narrative (Details)

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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