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Revenue (Components of Lease Income) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]    
Operating lease revenue $ 90,672 $ 105,124
Sales-type lease revenue 538 8,014
Variable lease revenue 5,176 5,273
Total revenues $ 96,386 $ 118,411