Equity - At-the-Market (ATM) Program (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2016
Procceds from At-the-Market (ATM) program		$ 85,780
ATM
Shares authorized	12,000,000
Shares issued in stock offerings, net of offering costs (in shares)		1,312,269
Procceds from At-the-Market (ATM) program		$ 85,800