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Summary of Significant Accounting Policies - Impact of Adoption of New Accounting Standard (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Rental income $ 111,452 $ 105,078 $ 331,247 $ 311,171
Other operating 2,010 1,947 5,973 5,816
Revenues 113,462 107,025 337,220 316,987
Interest and other income, net 41 354 571 396
NET INCOME $ 6,548 3,173 $ 53,456 60,243
As Reported        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Rental income   106,561   315,519
Other operating   392   1,249
Revenues   106,953   316,768
Interest and other income, net   426   616
NET INCOME   $ 3,173   $ 60,243