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Stockholders' Equity (Narrative) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Nov. 06, 2019
Class of Stock [Line Items]      
Common stock repurchased $ 1,002,000 $ 1,300,000  
2019 Stock Repurchase Program      
Class of Stock [Line Items]      
Stock repurchase program, authorized amount     $ 25,000,000
Class A Common Stock | 2019 Stock Repurchase Program      
Class of Stock [Line Items]      
Common stock repurchased (in shares) 32,286    
Common stock repurchased $ 1,000,000    
Class A Common Stock | 2018 Stock Repurchase Program      
Class of Stock [Line Items]      
Common stock repurchased (in shares)   36,294  
Common stock repurchased   $ 1,300,000