Notes Payable, Revolving Credit Facility, Interest and Amortization of Deferred Debt Costs - Scheduled Maturities of Debt, Including Scheduled Principal Amortization (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Balloon Payments
April 1 through December 31, 2017	$ 0
2018	125,865
2019	60,793
2020	61,163
2021	11,012
2022	36,503
Thereafter	436,691
Principal amount	732,027
Scheduled Principal Amortization
April 1 through December 31, 2017	20,710
2018	27,451
2019	26,139
2020	23,470
2021	23,037
2022	23,387
Thereafter	100,843
Principal amount	245,037
Total
April 1 through December 31, 2017	20,710
2018	153,316
2019	86,932
2020	84,633
2021	34,049
2022	59,890
Thereafter	537,534
Principal amount	977,064
Unamortized deferred debt costs	7,426	$ 7,500
Net	$ 969,638