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Stockholders' Equity (Stock Repurchase Program) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Nov. 02, 2020
Dec. 31, 2014
Stockholders' Equity Note [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) 20,101,494 14,085,678 0    
Average cost per share (usd per share) $ 4.26 $ 3.61      
Cost for shares repurchased $ 85,600,000 $ 50,800,000      
Payments for fees and commissions paid to the sales agent 201,000 $ 141,000      
Warrants repurchased (in shares)   17,593,576      
Remaining authorized repurchase amount $ 80,300,000