CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Class A [Member]
Class B [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Class A [Member]
Retained Earnings [Member]
Class B [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Common Stock [Member]
Class A [Member]
Common Stock [Member]
Class B [Member]
Additional Paid-in Capital [Member]
Balance at Dec. 31, 2013 $ 228,702     $ 207,993     $ 645 $ 217 $ 933 $ 18,914
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Cash dividends declared on common stock   $ (522) $ (2,665)   $ (522) $ (2,665)        
Issuance of restricted common stock 0               38 (38)
Forfeiture of restricted common stock 0               (2) 2
Foreign currency translation adjustment (11,255)           (11,255)      
Unrealized holding gains on marketable securities arising during the year net of taxes 147           147      
Increase in APIC pool associated with tax benefits related to restricted stock awards 31                 31
Stock-based compensation expense 2,717                 2,717
Change in unfunded SERP liability, net of taxes (1,485)           (1,485)      
Net (loss) earnings 8,603 1,492 7,111 8,603            
Balance at Dec. 31, 2014 224,273     213,409     (11,948) 217 969 21,626
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Cash dividends declared on common stock   (522) (2,713)   (522) (2,713)        
Issuance of restricted common stock 0               8 (8)
Forfeiture of restricted common stock 0               (7) 7
Foreign currency translation adjustment (9,954)           (9,954)      
Unrealized holding gains on marketable securities arising during the year net of taxes 5           5      
Stock-based compensation expense 2,815                 2,815
Change in unfunded SERP liability, net of taxes 21           21      
Net (loss) earnings 19,197 3,331 15,866 19,197            
Balance at Dec. 31, 2015 233,122     229,371     (21,876) 217 970 24,440
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Cash dividends declared on common stock   (522) (2,728)   $ (522) $ (2,728)        
Issuance of restricted common stock 0               18 (18)
Forfeiture of restricted common stock 0               (3) 3
Foreign currency translation adjustment (9,671)           (9,671)      
Unrealized holding gains on marketable securities arising during the year net of taxes (10)           (10)      
Stock-based compensation expense 2,817                 2,817
Change in unfunded SERP liability, net of taxes 260           260      
Net (loss) earnings (64,834) $ (11,408) $ (53,426) (64,834)            
Balance at Dec. 31, 2016 $ 158,434     $ 161,287     $ (31,297) $ 217 $ 985 $ 27,242