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Lease Accounting - Lessor Accounting (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Lessor, Lease, Description [Line Items]          
Long-term installment receivable $ 3,953   $ 3,953   $ 6,924
Revenue 166,197 $ 158,664 493,110 $ 383,732  
2019 (remainder) 1,418   1,418    
2020 5,673   5,673    
2021 3,356   3,356    
Total installment receivables 10,447   10,447    
Less: present value discount (2,569)   (2,569)    
Present value of installment receivables 7,878   7,878    
Sales type lease          
Lessor, Lease, Description [Line Items]          
Installment receivable, current 3,900   3,900   3,700
Long-term installment receivable 4,000   4,000   $ 6,900
Revenue 400 300 1,000 600  
Interest income on capital lease transactions $ 100 $ 200 $ 500 $ 500