Notes Payable (Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Detail of interest expensed and incurred
Total interest incurred	$ 8,683	$ 7,580	$ 17,263	$ 15,120
Interest capitalized	(814)	(610)	(1,717)	(983)
Total interest expense	$ 7,869	$ 6,970	$ 15,546	$ 14,137