Debt - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Debt Disclosure [Abstract]
Gross interest	$ 35,840	$ 23,913	$ 67,453	$ 44,152
Capitalized interest	(359)	(1,910)	(995)	(6,479)
Interest expense	$ 35,481	$ 22,003	$ 66,458	$ 37,673