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Schedule II Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finance Lease - Allowance for doubtful accounts      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning Balance $ 0 $ 0 $ 527
Additions     (527)
(Reversals) 0 0  
(Write-offs)/ Reversals 0 0 0
Ending Balance 0 0 0
Accounts Receivable-Allowance for doubtful accounts:      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning Balance 1,240 3,002 28,082
Additions   (568) 581
(Reversals) 114    
(Write-offs)/ Reversals (78) (1,194) (25,661)
Ending Balance $ 1,276 $ 1,240 $ 3,002