Interest and Debt Expense - Details of Interest and Debt Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Interest And Debt Expense [Abstract]
Interest expense	$ 36,820	$ 42,237	$ 109,285	$ 125,191
Amortization of deferred financing costs	1,458	584	4,121	1,754
Total interest and debt expense	$ 38,278	$ 42,821	$ 113,406	$ 126,945