Interest and Debt Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Interest and Debt Expense [Abstract]
Interest expense	$ 96,297	$ 112,736	$ 191,625	$ 218,248
Amortization of deferred financing costs	7,497	7,737	14,953	12,159
Capitalized interest and debt expenses	(11,702)	(16,560)	(22,812)	(30,182)
Interest and Debt Expense, Total	$ 92,092	$ 103,913	$ 183,766	$ 200,225