Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Details)

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Fair Value Measurements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value on Non-Recurring Basis      
Amount outstanding $ 739,150    
Amount of transfers of assets and liabilities measured on a recurring and non-recurring basis between Levels 1, 2 and 3 of the fair value hierarchy 0 $ 0 $ 0
Senior Notes      
Fair Value on Non-Recurring Basis      
Amount outstanding 400,000 $ 400,000  
Fair Value on Non-Recurring Basis | Level 1 fair value measurement | Senior Notes      
Fair Value on Non-Recurring Basis      
Fair value $ 423,000