Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity Common Stock Rollforward (Details)

v3.19.1
Stockholders' Equity Common Stock Rollforward (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Nov. 01, 2017
shares
Jul. 31, 2018
USD ($)
shares
Dec. 31, 2018
shares
Dec. 31, 2017
shares
Dec. 31, 2016
shares
Oct. 31, 2017
shares
Increase (Decrease) in Common Stock Outstanding [Roll Forward]            
Common shares outstanding at beginning of period (in shares)     174,496,587 173,826,163 176,953,403  
Number of shares of stock issued during period (in shares)         30,301  
Number of shares of restricted common stock issued during period (in shares)         852,459  
Number of shares of stock repurchased during period (in shares)         (4,010,000)  
Common shares outstanding at end of period (in shares)     248,085,721 174,496,587 173,826,163  
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 1,284,010 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      
Number of shares of stock issued during period (in shares)   72,587,772 72,616,483 26,950    
Number of shares of restricted common stock issued during period (in shares)     972,651 643,474    
Common shares outstanding at end of period (in shares)     248,085,721 174,496,587