Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity Common Stock Rollforward (Details)

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Stockholders' Equity Common Stock Rollforward (Details)
$ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Nov. 01, 2017
shares
Jul. 31, 2018
USD ($)
shares
Sep. 30, 2018
shares
Sep. 30, 2017
shares
Dec. 31, 2017
shares
Oct. 31, 2017
shares
Dec. 31, 2016
shares
Increase (Decrease) in Common Stock Outstanding [Roll Forward]              
Common shares outstanding at beginning of period (in shares)     174,496,587        
Common shares outstanding at end of period (in shares)     248,078,170   174,496,587    
Reverse stock split, conversion ratio 0.50            
Common shares authorized (in shares) 450,000,000   450,000,000   450,000,000 900,000,000  
Aggregate cash consideration exchanged for shares of CYS common stock | $   $ 14,967          
Number of nonvested restricted common shares outstanding (in shares)     1,593,701 1,323,443 1,284,010   1,319,712
Common Stock [Member]              
Increase (Decrease) in Common Stock Outstanding [Roll Forward]              
Common shares outstanding at beginning of period (in shares)     174,496,587 173,826,163 173,826,163    
Number of shares of stock issued during period (in shares)   72,587,772 72,608,932 19,688      
Number of shares of restricted common stock issued during period (in shares)     972,651 643,505      
Common shares outstanding at end of period (in shares)     248,078,170 174,489,356 174,496,587