Annual report pursuant to Section 13 and 15(d)

Organization and Basis of Presentation - Ownership Information (Details)

v3.19.1
Organization and Basis of Presentation - Ownership Information (Details) - shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Share Count (in shares) 44,876,649 44,589,306
% Ownership 100.00% 100.00%
Wexford    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Share Count (in shares) 21,988,473 25,009,319
% Ownership 49.00% 56.10%
Gulfport    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Share Count (in shares) 9,826,893 11,171,887
% Ownership 21.90% 25.10%
Rhino    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Share Count (in shares) 104,100 568,794
% Ownership 0.20% 1.30%
Outstanding shares owned by related parties    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Share Count (in shares) 31,919,466 36,750,000
% Ownership 71.10% 82.50%