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Summary of Fair Value of Financial Instruments - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Maximum maturity term of financial assets (less than) 90 days  
Long-term debt, gross $ 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) 94.30% 94.40%
Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total indebtedness fair value variance from carrying value (as a percent) 104.20% 104.30%