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Acquisitions (Details)
$ in Thousands
12 Months Ended
Aug. 15, 2018
USD ($)
a
Dec. 31, 2018
USD ($)
a
Dec. 31, 2017
USD ($)
a
shares
Dec. 31, 2016
USD ($)
a
Business Acquisition [Line Items]        
Payments to Acquire Mineral Rights | $   $ 610,131 $ 344,079 $ 205,721
Series of Individually Immaterial Business Acquisitions [Member]        
Business Acquisition [Line Items]        
Mineral Properties Acquired, Net Royalty Acres   3,585 3,157 2,142
Payments to Acquire Mineral Rights | $   $ 440,400 $ 343,100 $ 205,700
Mineral Properties, Net Royalty Acres   14,841 9,570  
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares     174,513  
Diamondback Limited Partner [Member]        
Business Acquisition [Line Items]        
Mineral Properties Acquired, Gross Acres 32,424      
Mineral Properties Acquired, Net Royalty Acres 1,696      
Payments to Acquire Mineral Rights | $ $ 175,000      
Percentage of mineral acres operated by affiliate 80.00%