Stockholders’ Equity of the Company and Partners' Capital of the Operating Partnership - Summary of Dividends/Distributions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Total Common Stock Dividends / Unit Distributions	$ 111,478	$ 104,106	$ 91,318
Common Stock / Operating Partnership Units
Class of Stock [Line Items]
Total Common Stock Dividends / Unit Distributions	$ 111,478	$ 104,106	$ 91,318