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Shareholders' Equity
 6 Months Ended
Jun. 30, 2019
Shareholders' Equity [Abstract]  
Shareholders' Equity
(11)  Shareholders' Equity:

On August 31, 2017, the Company's Board of Directors authorized the reinstatement of its share repurchase program for up to 2,464,209 shares of the Company's Class A or Class B Common Stock.  On August 7, 2018, the Company's Board of Directors reaffirmed its share repurchase program, but also provided that the aggregate dollar amount of shares of the Company's Common Stock that may be repurchased under the share repurchase program through August 8, 2019 may not exceed $25,000.  As of June 30, 2019, the Company has repurchased $9,293 under the share repurchase program.  Pursuant to this share repurchase program, the Company entered into a Rule 10b5-1 plan on June 21, 2019, which authorized the repurchase of up to $4,000 of the Company's outstanding Common Stock at various pricing thresholds, in accordance with guidelines specified under Rule 10b5-1 of the Securities Exchange Act of 1934.  The Rule 10b5-1 plan expires on August 8, 2019.  No duration has been placed on the Company's share repurchase program, and the Company reserves the right to amend, suspend or discontinue it at any time.  The share repurchase program does not commit the Company to repurchase any shares of its Common Stock.

During the six months ended June 30, 2019, the Company paid $6,487 to repurchase 2,893 shares of Class A and 371,188 shares of Class B Common Stock under the share repurchase program.

The following table illustrates changes in accumulated other comprehensive income (loss) by component for the six months ended June 30, 2019:

  
Foreign
Currency
  
Unrealized Holding Gains (Losses) on
Available-for-sale Securities
  
Total
 
Beginning balance at December 31, 2018
 
$
(1,139
)
 
$
(6,208
)
 
$
(7,347
)
             
Other comprehensive income before reclassifications
  
591
   
14,758
   
15,349
 
Amounts reclassified from accumulated other comprehensive income (loss)
  
–
   
215
   
215
 
             
Net current-period other comprehensive income
  
591
   
14,973
   
15,564
 
             
Ending balance at June 30, 2019
 
$
(548
)
 
$
8,765
  
$
8,217
 

The following table illustrates changes in accumulated other comprehensive income (loss) by component for the six months ended June 30, 2018:

  
Foreign
Currency
  
Unrealized Holding Gains (Losses) on
Available-for-sale Securities
  
Total
 
Beginning balance at December 31, 2017
 
$
(309
)
 
$
46,700
  
$
46,391
 
             
Cumulative effect of adoption of ASU 2016-01, net of tax
  
–
   
(46,157
)
  
(46,157
)
             
Balance at January 1, 2018
  
(309
)
  
543
   
234
 
             
Cumulative effect of adoption of ASU 2018-02
  
–
   
117
   
117
 
Other comprehensive loss before reclassifications
  
(411
)
  
(4,050
)
  
(4,461
)
Amounts reclassified from accumulated other comprehensive income (loss)
  
–
   
(1,097
)
  
(1,097
)
             
Net current-period other comprehensive loss
  
(411
)
  
(5,147
)
  
(5,558
)
             
Ending balance at June 30, 2018
 
$
(720
)
 
$
(4,487
)
 
$
(5,207
)