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Fair Value Measurements - Schedule of Certain Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Fair Value Measurements    
Carrying Amount $ 868,998 $ 610,397
Recurring basis    
Fair Value Measurements    
Fair Value 800,710 605,286
Recurring basis | Level 1    
Fair Value Measurements    
Fair Value 0 0
Recurring basis | Level 2    
Fair Value Measurements    
Fair Value 0 0
Recurring basis | Level 3    
Fair Value Measurements    
Fair Value $ 800,710 $ 605,286