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Receivables (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Receivables [Abstract]    
Accounts receivable $ 14,383 $ 6,706
Allowance for doubtful accounts (2,258) (2,472)
Accounts receivable, net 12,125 4,234
Straight-line rent receivables 131,713 106,466
Allowance for doubtful accounts 0 0
Straight-line rent receivables, net $ 131,713 $ 106,466