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Revenue from Contracts with Customers - Disaggregates revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue from Contracts with Customers                      
Leasing revenue                 $ 265,894    
Gain on sale of leased equipment                 6,944 $ 4,929 $ 3,482
Revenue                 87,009 80,189 57,091
Total revenue $ 118,190 $ 80,958 $ 78,702 $ 70,497 $ 63,189 $ 65,861 $ 67,844 $ 77,946 348,347 274,840 207,274
Spare parts and equipment sales                      
Revenue from Contracts with Customers                      
Revenue                 71,141    
Managed services                      
Revenue from Contracts with Customers                      
Revenue                 4,303    
Other revenue                      
Revenue from Contracts with Customers                      
Revenue                 65    
Leasing and Related Operations | Other revenue | Other Revenue [Member]                      
Revenue from Contracts with Customers                      
Revenue                 3,300    
Operating Segments | Leasing and Related Operations                      
Revenue from Contracts with Customers                      
Leasing revenue                 265,894    
Gain on sale of leased equipment                 6,944 4,458 3,246
Revenue                 87,009 80,189 57,091
Total revenue                 307,263 245,003 192,278
Operating Segments | Leasing and Related Operations | Spare parts and equipment sales                      
Revenue from Contracts with Customers                      
Revenue                 30,122    
Operating Segments | Leasing and Related Operations | Managed services                      
Revenue from Contracts with Customers                      
Revenue                 4,303    
Operating Segments | Spare Parts Sales                      
Revenue from Contracts with Customers                      
Gain on sale of leased equipment                   471 236
Total revenue                 42,746 31,210 16,631
Operating Segments | Spare Parts Sales | Spare parts and equipment sales                      
Revenue from Contracts with Customers                      
Revenue                 41,019    
Operating Segments | Spare Parts Sales | Other revenue                      
Revenue from Contracts with Customers                      
Revenue                 1,727    
Eliminations                      
Revenue from Contracts with Customers                      
Total revenue                 (1,662) $ (1,373) $ (1,635)
Eliminations | Other revenue                      
Revenue from Contracts with Customers                      
Revenue                 $ (1,662)