Notes Payable, Revolving Credit Facility, Interest and Amortization of Deferred Debt Costs - Interest Expense and Amortization of Deferred Debt Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Debt Disclosure [Abstract]
Interest incurred	$ 11,677	$ 11,384
Amortization of deferred debt costs	332	362
Capitalized interest	(920)	(340)
Interest expense and amortization of deferred debt costs	$ 11,089	$ 11,406