Quarterly report pursuant to Section 13 or 15(d)

Equity (Details)

v3.8.0.1
Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Class of Stock [Line Items]    
Conversion of common units to common shares (in units/shares) 53,817 185,000
Forward Equity Sale Agreement    
Class of Stock [Line Items]    
Common shares issued under forward equity sale agreements $ 19,976  
Forward Equity Sale Agreement | Common Shares    
Class of Stock [Line Items]    
Number of shares issued 677,000  
Common shares issued under forward equity sale agreements $ 7  
Remaining capacity under forward equity sale agreements 6,800,000  
Common Stock Issued to Public Under At-the-Market Program    
Class of Stock [Line Items]    
Common shares issued under forward equity sale agreements   $ 18,222
Common Stock Issued to Public Under At-the-Market Program | Common Shares    
Class of Stock [Line Items]    
Common shares issued under forward equity sale agreements   $ 5
At-market stock, offering program established, remaining capacity $ 70,000