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Stockholders' Equity (Stock Repurchase Program) (Details) - USD ($)
 2 Months Ended 3 Months Ended
Apr. 30, 2021
Mar. 31, 2021
Nov. 02, 2020
Dec. 31, 2013
Class of Stock [Line Items]        
Stock repurchase program, authorized amount     $ 250,000,000  
Number of shares authorized to be repurchased under the Repurchase Program (in shares)       10,000,000.0
Number of remaining shares authorized to be repurchased under the Repurchase Program (in shares)       6,600,000
Shares repurchased and retired (in shares)   5,946,678    
Average cost per share (usd per share)   $ 4.09    
Cost for shares repurchased   $ 24,300,000    
Payments for fees and commissions paid to the sales agent   $ 59,000    
Subsequent Event        
Class of Stock [Line Items]        
Stock repurchase program, authorized amount $ 121,200,000      
Shares repurchased and retired (in shares) 10,778,896      
Average cost per share (usd per share) $ 4.14