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Stockholders' Equity (Stock Repurchase Program) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Nov. 02, 2020
Dec. 31, 2013
Share-based Payment Arrangement [Abstract]          
Stock repurchase program, authorized amount       $ 250,000,000  
Number of shares authorized to be repurchased under the Repurchase Program (in shares)         10,000,000
Number of remaining shares authorized to be repurchased under the Repurchase Program (in shares)         6,600,000
Shares repurchased and retired (in shares) 14,085,678 0 0    
Average cost per share (usd per share) $ 3.61        
Cost for shares repurchased $ 50,800,000        
Payments for fees and commissions paid to the sales agent $ 141,000        
Warrants repurchased (in shares) 17,593,576        
Remaining authorized repurchase amount $ 165,700,000