Notes Payable (Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Detail of interest expensed and incurred
Total interest incurred	$ 8,350	$ 8,683	$ 16,506	$ 17,263
Interest capitalized	(1,016)	(814)	(1,758)	(1,717)
Total interest expense	$ 7,334	$ 7,869	$ 14,748	$ 15,546