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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, 2018
Mar. 31, 2017
Debt Disclosure [Abstract]    
Interest incurred $ 12,200 $ 12,288
Amortization of deferred debt costs 470 345
Capitalized interest (1,144) (769)
Interest expense and amortization of deferred debt costs $ 11,526 $ 11,864