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Summary of Fair Value of Financial Instruments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Maximum maturity term of financial assets 90 days  
Note receivable $ 8,098 $ 8,098
Indebtedness, Carrying value $ 825,522 $ 826,236
Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable fair value variance from carrying value (as a percent) 3.10% (1.00%)
Total indebtedness fair value variance from carrying value (as a percent) 94.80% 94.40%
Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable fair value variance from carrying value (as a percent) 7.10% 9.50%
Total indebtedness fair value variance from carrying value (as a percent) 104.80% 104.40%