Annual report pursuant to Section 13 and 15(d)

Mortgage Notes Payable, Revolving Credit Facility, and Term Loan Facility Mortgage Notes Payable, Revolving Credit Facility, and Term Loan Facility - Derivative Instrument Impact (Details)

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Mortgage Notes Payable, Revolving Credit Facility, and Term Loan Facility Mortgage Notes Payable, Revolving Credit Facility, and Term Loan Facility - Derivative Instrument Impact (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]      
Other comprehensive income (loss), unrealized gain on derivatives $ 35 $ 0 $ 0
Interest Rate Cap      
Derivative Instruments, Gain (Loss) [Line Items]      
Other comprehensive income (loss), unrealized gain on derivatives (239) $ 0 $ 0
Interest Rate Swap      
Derivative Instruments, Gain (Loss) [Line Items]      
Other comprehensive income (loss), unrealized gain on derivatives $ 274