Notes Payable (Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Detail of interest expensed and incurred
Total interest incurred	$ 8,696	$ 7,667	$ 25,959	$ 22,787
Interest capitalized	(1,023)	(850)	(2,740)	(1,833)
Total interest expense	$ 7,673	$ 6,817	$ 23,219	$ 20,954