Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details)
Jan. 29, 2020
$ / shares
shares
Aug. 23, 2018
$ / shares
May 10, 2018
$ / shares
Feb. 28, 2018
$ / shares
Class of Stock [Line Items]        
Dividends declared (in dollars per share) | $ / shares   $ 1.8125 $ 1.8125 $ 1.8125
Subsequent Event | Reverse Stock Split        
Class of Stock [Line Items]        
Shares owned prior to split which entitled shareholders to cash (in dollars per share) | $ / shares $ 30.00      
Minimum | Subsequent Event | Reverse Stock Split        
Class of Stock [Line Items]        
Stock split ratio 0.2      
Number of shares owned prior to split which entitled shareholders to cash | shares 5      
Minimum | Subsequent Event | Forward Stock Split        
Class of Stock [Line Items]        
Stock split ratio 5      
Maximum | Subsequent Event | Reverse Stock Split        
Class of Stock [Line Items]        
Stock split ratio 0.01      
Number of shares owned prior to split which entitled shareholders to cash | shares 100      
Maximum | Subsequent Event | Forward Stock Split        
Class of Stock [Line Items]        
Stock split ratio 100