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Summary of Significant Accounting Policies - Accounts Receivable Net of Allowance for Uncollectable Tenant Receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable $ 6,835 $ 8,834
Allowance for doubtful accounts (2,472) (1,827)
Accounts receivable, net 4,363 7,007
Straight-line rent receivables, net 109,457 79,209
Allowance for Straight-Line Receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Straight-line rent receivables 109,457 79,345
Allowance for doubtful accounts $ 0 $ (136)