Annual report pursuant to Section 13 and 15(d)

Equity Transactions (Narrative) (Details)

v3.3.1.900
Equity Transactions (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 2 Months Ended 12 Months Ended
Nov. 16, 2015
Mar. 13, 2015
Sep. 15, 2014
Feb. 29, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Class of Stock [Line Items]              
Preferred stock dividend         $ 7,895 $ 7,895 $ 4,627
Stock issued during period (in shares) 12,000,000 9,000,000 12,500,000        
Shares price issued $ 8.40 $ 6.55 $ 9.00        
Net proceeds from issuance of common stock public offering $ 109,913 $ 65,644 $ 122,514        
Over-Allotment Option [Member]              
Class of Stock [Line Items]              
Stock issued during period (in shares) 1,800,000 1,350,000 1,875,000        
Series A Preferred Stock [Member]              
Class of Stock [Line Items]              
Preferred Stock, Dividend Rate, Percentage         10.00%    
Preferred stock, liquidation preference (in dollars per share)         $ 50.00 $ 50.00  
Preferred Stock, Dividend Rate, Per-Dollar-Amount, Per Annum         $ 5.00    
Preferred stock dividend         $ 7,895 $ 7,895 $ 4,627
Series A Preferred Stock [Member] | Subsequent Event [Member]              
Class of Stock [Line Items]              
Conversion of Stock, Shares Converted       120,000      
Common Stock              
Class of Stock [Line Items]              
Value of a share of common stock         $ 8.34    
Common stock shares to be issued for each share of preferred stock upon conversion         6.0    
Common Stock | Subsequent Event [Member]              
Class of Stock [Line Items]              
Conversion of Stock, Shares Issued       719,000