Interest and Debt Expense - Details of Interest and Debt Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Interest And Debt Expense [Abstract]
Interest expense	$ 34,123	$ 33,321
Amortization of deferred financing costs	2,801	2,761
Total interest and debt expense	$ 36,924	$ 36,082