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Summary of Fair Value of Financial Instruments - Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Maximum maturity term of financial assets 90 days  
Indebtedness, Carrying value $ 1,065,000 $ 992,586
Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total indebtedness fair value variance from carrying value (as a percent) 93.40% 94.40%
Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total indebtedness fair value variance from carrying value (as a percent) 103.30% 104.30%