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At-the-Market (ATM) Program (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended
Sep. 30, 2015
Mar. 31, 2016
Procceds from At-the-Market (ATM) program   $ 30,547
ATM    
Shares authorized 12,000,000  
Shares issued in stock offerings, net of offering costs (in shares)   500,000
Procceds from At-the-Market (ATM) program   $ 30,500