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Shareholders' Equity
 3 Months Ended
Mar. 31, 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.  Pursuant to this share repurchase program, the Company entered into a Rule 10b5-1 plan on March 22, 2019, which authorized the repurchase of up to $3,500 of the Company's outstanding common shares 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 May 9, 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 three months ended March 31, 2019, the Company paid $468 to repurchase 100 shares of Class A and 24,858 shares of Class B Common Stock under the share repurchase program.

The following table illustrates changes in accumulated other comprehensive income by component for the three months ended March 31, 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
  
307
   
7,671
   
7,978
 
Amounts reclassified from accumulated other comprehensive income (loss)
  
–
   
785
   
785
 
             
Net current-period other comprehensive income
  
307
   
8,456
   
8,763
 
             
Ending balance at March 31, 2019
 
$
(832
)
 
$
2,248
  
$
1,416
 


The following table illustrates changes in accumulated other comprehensive income (loss) by component for the three months ended March 31, 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
  
(223
)
  
(2,998
)
  
(3,221
)
Amounts reclassified from accumulated other comprehensive income (loss)
  
–
   
(123
)
  
(123
)
             
Net current-period other comprehensive loss
  
(223
)
  
(3,121
)
  
(3,344
)
             
Ending balance at March 31, 2018
 
$
(532
)
 
$
(2,461
)
 
$
(2,993
)