Interest and Debt Expense - Details of Interest and Debt Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest And Debt Expense [Abstract]
Interest expense	$ 34,288	$ 35,861
Debt breakage costs	2,715
Amortization of deferred financing costs	2,730	1,258
Total interest and debt expense	$ 39,733	$ 37,119