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Business Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Operating results for the business segments        
Revenues $ 76,075 $ 61,009 $ 180,126 $ 147,626
Income (loss) from operations 2,730 (9,276) 11,943 558
Write-down of assets held for sale to fair value 100      
Impairment of property and equipment 801 993
Equity in the net loss of equity method investees (1,173) (1,071) (1,552) (1,868)
GRE [Member]        
Operating results for the business segments        
Revenues 66,472 54,431 145,617 130,949
Income (loss) from operations 5,957 (5,418) 18,974 8,085
Impairment of property and equipment    
Equity in the net loss of equity method investees
GRE International [Member]        
Operating results for the business segments        
Revenues 5,037 2,870 11,990 7,713
Income (loss) from operations (607) (1,607) (3,127) (3,350)
Impairment of property and equipment    
Equity in the net loss of equity method investees (1,502) (867) (1,502) (1,938)
GES [Member]        
Operating results for the business segments        
Revenues 4,566 3,708 22,519 8,964
Income (loss) from operations (1,113) (682) (771) (914)
Impairment of property and equipment 801   993  
Equity in the net loss of equity method investees
GOGAS [Member]        
Operating results for the business segments        
Revenues
Income (loss) from operations (172) (381) (395) (545)
Impairment of property and equipment    
Equity in the net loss of equity method investees 224 (204) 36 70
Corporate [Member]        
Operating results for the business segments        
Revenues
Income (loss) from operations (1,335) (1,188) (2,738) (2,718)
Impairment of property and equipment    
Equity in the net loss of equity method investees $ 105 $ 14