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Other Assets (Schedule of Other Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Equity Method Investments And Other Assets [Abstract]      
Accounts receivable and other assets $ 2,864 $ 6,381  
Regulatory deposits 8,208 8,208  
Unamortized lease incentive payments 8,538 7,456  
Restricted cash 10,377 5,253 $ 5,381
Other Assets $ 29,987 $ 27,298