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Shareholders' Equity
 9 Months Ended
Sep. 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 6, 2019, 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 between August 6, 2019 and August 6, 2020 may not exceed $25,000, including a limit of up to $6,250 per quarter.  Pursuant to this share repurchase program, the Company entered into a Rule 10b5-1 plan on September 23, 2019 (the "Rule 10b5-1 Plan"), which authorized the repurchase of up to $625 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 November 7, 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 nine months ended September 30, 2019, the Company paid $10,283 to repurchase 6,520 shares of Class A and 595,326 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 nine months ended September 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
  
402
   
16,588
   
16,990
 
Amounts reclassified from accumulated other comprehensive income (loss)
  
–
   
(49
)
  
(49
)
             
Net current-period other comprehensive income
  
402
   
16,539
   
16,941
 
             
Ending balance at September 30, 2019
 
$
(737
)
 
$
10,331
  
$
9,594
 

The following table illustrates changes in accumulated other comprehensive income (loss) by component for the nine months ended September 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
  
(209
)
  
(4,815
)
  
(5,024
)
Amounts reclassified from accumulated other comprehensive income (loss)
  
–
   
(1,483
)
  
(1,483
)
             
Net current-period other comprehensive loss
  
(209
)
  
(6,298
)
  
(6,507
)
             
Ending balance at September 30, 2018
 
$
(518
)
 
$
(5,638
)
 
$
(6,156
)