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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Class A common stock
Class B common stock
Class U common stock
Common Stock
Class A common stock
Common Stock
Class B common stock
Common Stock
Class U common stock
Treasury Stock
Additional Paid-in Capital
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Balance, Beginning at Dec. 31, 2017 $ 348,275       $ 7 $ 2 $ 1   $ 888,650 $ (540,325) $ (60)
Balance, Beginning, Shares at Dec. 31, 2017         66,069,325 14,927,613 9,352,729        
Issuance of common stock upon exercise of stock options or awards of restricted stock units, Shares         17,356            
Tax payments related to shares withheld for share-based compensation plans (43)               (43)    
Stock-based compensation expense 1,249               1,249    
Repurchase of Class A common stock (2,402)               (2,402)    
Repurchase of Class A common stock, Shares         (500,587)     500,587      
Retirement of treasury stock, Shares               (500,587)      
Dividends paid (4,518)               (4,518)    
Change in fair value of marketable securities (1,239)                   (1,239)
Foreign currency translation gain (loss) 290                   290
Net income (loss) (1,808)                 (1,808)  
Balance, Ending at Mar. 31, 2018 339,804       $ 7 $ 2 $ 1   882,936 (542,133) (1,009)
Balance, Ending, Shares at Mar. 31, 2018         65,586,094 14,927,613 9,352,729        
Balance, Beginning at Dec. 31, 2017 348,275       $ 7 $ 2 $ 1   888,650 (540,325) (60)
Balance, Beginning, Shares at Dec. 31, 2017         66,069,325 14,927,613 9,352,729        
Foreign currency translation gain (loss) (260)                    
Net income (loss) 3,033                    
Balance, Ending at Jun. 30, 2018 335,662       $ 6 $ 2 $ 1   874,508 (537,293) (1,562)
Balance, Ending, Shares at Jun. 30, 2018         64,554,155 14,927,613 9,352,729        
Balance, Beginning at Mar. 31, 2018 339,804       $ 7 $ 2 $ 1   882,936 (542,133) (1,009)
Balance, Beginning, Shares at Mar. 31, 2018         65,586,094 14,927,613 9,352,729        
Issuance of common stock upon exercise of stock options or awards of restricted stock units 106               106    
Issuance of common stock upon exercise of stock options or awards of restricted stock units, Shares         56,147            
Tax payments related to shares withheld for share-based compensation plans (12)               (12)    
Stock-based compensation expense 1,176               1,176    
Repurchase of Class A common stock (5,258)       $ (1)       (5,257)    
Repurchase of Class A common stock, Shares         (1,088,086)     1,088,086      
Retirement of treasury stock, Shares               (1,088,086)      
Dividends paid (4,441)               (4,441)    
Change in fair value of marketable securities (3)                   (3)
Foreign currency translation gain (loss) (550)                   (550)
Net income (loss) 4,840                 4,840  
Balance, Ending at Jun. 30, 2018 335,662       $ 6 $ 2 $ 1   874,508 (537,293) (1,562)
Balance, Ending, Shares at Jun. 30, 2018         64,554,155 14,927,613 9,352,729        
Balance, Beginning at Dec. 31, 2018 332,732       $ 6 $ 2 $ 1   862,299 (528,164) (1,412)
Balance, Beginning, Shares at Dec. 31, 2018   63,210,531 14,927,613 9,352,729 63,210,531 14,927,613 9,352,729        
Tax payments related to shares withheld for share-based compensation plans (42)               (42)    
Tax payments related to shares withheld for share-based compensation plans, shares         25,059            
Stock-based compensation expense 800               800    
Repurchase of Class A common stock (7,706)               (7,706)    
Repurchase of Class A common stock, Shares         (2,098,443)     2,098,443      
Retirement of treasury stock, Shares               (2,098,443)      
Dividends paid (4,271)               (4,271)    
Change in fair value of marketable securities 763                   763
Foreign currency translation gain (loss) 30                   30
Net income (loss) 1,424                 1,424  
Balance, Ending at Mar. 31, 2019 323,730       $ 6 $ 2 $ 1   851,080 (526,740) (619)
Balance, Ending, Shares at Mar. 31, 2019         61,137,147 14,927,613 9,352,729        
Balance, Beginning at Dec. 31, 2018 332,732       $ 6 $ 2 $ 1   862,299 (528,164) (1,412)
Balance, Beginning, Shares at Dec. 31, 2018   63,210,531 14,927,613 9,352,729 63,210,531 14,927,613 9,352,729        
Foreign currency translation gain (loss) (288)                    
Net income (loss) (14,855)                    
Balance, Ending at Jun. 30, 2019 302,921       $ 6 $ 2 $ 1   846,345 (543,019) (414)
Balance, Ending, Shares at Jun. 30, 2019   60,718,613 14,927,613 9,352,729 60,718,613 14,927,613 9,352,729        
Balance, Beginning at Mar. 31, 2019 323,730       $ 6 $ 2 $ 1   851,080 (526,740) (619)
Balance, Beginning, Shares at Mar. 31, 2019         61,137,147 14,927,613 9,352,729        
Issuance of common stock upon exercise of stock options or awards of restricted stock units, Shares         20,000            
Stock-based compensation expense 836               836    
Repurchase of Class A common stock (1,302) $ (1,300)             (1,302)    
Repurchase of Class A common stock, Shares   (400,000)     (438,534)     438,534      
Retirement of treasury stock, Shares               (438,534)      
Dividends paid (4,269)               (4,269)    
Change in fair value of marketable securities 523                   523
Foreign currency translation gain (loss) (318)                   (318)
Net income (loss) (16,279)                 (16,279)  
Balance, Ending at Jun. 30, 2019 $ 302,921       $ 6 $ 2 $ 1   $ 846,345 $ (543,019) $ (414)
Balance, Ending, Shares at Jun. 30, 2019   60,718,613 14,927,613 9,352,729 60,718,613 14,927,613 9,352,729