Notes Payable (Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Detail of interest expensed and incurred
Total interest incurred	$ 8,939	$ 8,696	$ 25,445	$ 25,959
Interest capitalized	(1,229)	(1,023)	(2,988)	(2,740)
Total interest expense	$ 7,710	$ 7,673	$ 22,457	$ 23,219