Interest and Debt Expense - Details of Interest and Debt Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest And Debt Expense [Abstract]
Interest expense	$ 34,501	$ 34,353	$ 103,012	$ 101,729
Amortization of deferred financing costs	2,824	2,752	8,450	8,267
Total interest and debt expense	$ 37,325	$ 37,105	$ 111,462	$ 109,996