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Stockholders' Equity (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Nov. 06, 2019
Class of Stock [Line Items]              
Common stock repurchased $ 1,002,000 $ 25,000 $ 85,000 $ 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         $ 1,000,000.0    
Class A Common Stock | 2018 Stock Repurchase Program              
Class of Stock [Line Items]              
Common stock repurchased (in shares)   525       39,049  
Common stock repurchased   $ 100,000       $ 1,400,000