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Basis of Presentation and Summary of Significant Accounting Policies - Reclassification of Prior Year Presentation of Rental Income and Property Expense Recovery (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Rental income	$ 103,356	$ 85,991	$ 179,841	$ 166,390
Presentation prior to January 1, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease income		61,488		121,573
Property expense recovery		18,199		35,811
Lease termination income		6,304		9,006
Rental income		$ 85,991		$ 166,390

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Amount of contingent rental revenue recognized for the period under lease, based on the occurrences of an event or condition.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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