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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Security Deposits and Prepaid Rent (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]    
Security deposits $ 36,458 $ 29,837
Prepaid rent 27,573 37,041
Security deposits and prepaid rent $ 64,031 $ 66,878