Interest and Debt Expense - Details of Interest and Debt Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest And Debt Expense [Abstract]
Interest expense	$ 36,604	$ 41,650	$ 72,465	$ 82,954
Amortization of deferred financing costs	1,405	586	2,663	1,170
Total interest and debt expense	$ 38,009	$ 42,236	$ 75,128	$ 84,124