Quarterly report pursuant to Section 13 or 15(d)

Equity - Schedule of Common Stock Public Offerings and ATM (Details)

v3.10.0.1
Equity - Schedule of Common Stock Public Offerings and ATM (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Net Proceeds       $ 15,326 $ 98,316
1/20/17 to 2/2/17 Closing Date [Member] | ATM [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares Issued (in shares)     197    
Price Per Share (in usd per share)     $ 19.18    
Net Proceeds     $ 4,000    
3/10/2017 Closing Date [Member] | Public Offering [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares Issued (in shares)     3,450    
Price Per Share (in usd per share)     $ 18.73    
Net Proceeds     $ 64,000    
5/17/17 to 6/22/17 Closing Date [Member] | ATM [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares Issued (in shares)   1,376      
Price Per Share (in usd per share)   $ 22.71      
Net Proceeds   $ 31,000      
5/18/2018 to 6/25/2018 Closing Date [Member] | ATM [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares Issued (in shares) 834        
Price Per Share (in usd per share) $ 18.76        
Net Proceeds $ 15,000