XML 165 R149.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stockholders' Equity - Additional Information (Details)
 6 Months Ended 12 Months Ended
Jul. 14, 2017
USD ($)
Jul. 06, 2017
USD ($)
Jun. 16, 2017
$ / shares
shares
Jun. 14, 2017
shares
Jun. 30, 2017
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Jan. 30, 2017
shares
Class Of Stock [Line Items]                
Dividends declared and paid           $ 11,277,000    
Common stock, par value | $ / shares         $ 0.01 $ 0.01    
Proceeds from issuance of common stock   $ 82,700,000       $ 76,829,000 $ 49,592,000  
Merger transaction, the number of shares into which each share of common stock issued and outstanding prior to merger was converted       0.20        
Merger transaction, number of fractional shares issued | shares       0        
Repurchase of shares           $ 15,003,000    
Common Stock                
Class Of Stock [Line Items]                
Issuance of common stock, net of issuance cost, shares | shares         4,630,194 4,630,194 3,078,075  
Issuance of common stock, price per share | $ / shares     $ 19.00          
Under Writer | Common Stock                
Class Of Stock [Line Items]                
Issuance of common stock, net of issuance cost, shares | shares         855,000      
Issuance of common stock, price per share | $ / shares         $ 19.00      
Series B Preferred Stock                
Class Of Stock [Line Items]                
Preferred stock, dividend rate, percentage             7.50%  
Preferred stock, liquidation preference per share | $ / shares             $ 1,000  
Preferred stock, shares issued | shares               1,050
Dividends declared and paid           $ 776,000    
Series A Preferred Stock                
Class Of Stock [Line Items]                
Preferred stock, liquidation preference per share | $ / shares     $ 1,000          
Shares of common stock used to determine cash value of repurchase | shares     89.469          
Repurchase of shares $ 25,500,000              
Dividends Payable           $ 10,500,000