Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details)

v3.8.0.1
Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Minimum rental payments due   $ 91,136
Ground Leases    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Minimum rental payments due   $ 90,200
Accounting Standards Update 2014-09    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Effect of change on net income $ 18,000