Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Equity - Schedule of Common Stock Public Offerings and ATM (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Net Proceeds $ 0 $ 67,840
1/20/17 to 2/2/17 Closing Date [Member] | At the Market Offering [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares Issued 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 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] | At the Market Offering [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares Issued 1,376  
Price Per Share (in usd per share) $ 22.71  
Net Proceeds $ 31,000