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Summary of Fair Value of Financial Instruments - Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Maximum maturity term of financial assets 90 days  
Note receivable $ 0 $ 8,098
Indebtedness, Carrying value $ 993,334 $ 826,236
Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable fair value variance from carrying value (as a percent)   (1.00%)
Total indebtedness fair value variance from carrying value (as a percent) 94.60% 94.40%
Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable fair value variance from carrying value (as a percent)   9.50%
Total indebtedness fair value variance from carrying value (as a percent) 104.60% 104.40%