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Fair Value of Financial Instruments - Carrying Value and Fair Value of Debt (Details) - Level 2 - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Carrying Amount    
Debt Instrument [Line Items]    
Total debt $ 843,421 $ 866,465
Estimated Fair Value    
Debt Instrument [Line Items]    
Total debt $ 839,737 $ 905,601