v3.4.0.3
Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Non-Voting Common Stock [Member]
Voting Common Stock [Member]
Additional Paid-in Capital [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Balance at Dec. 31, 2014 $ 597,068 $ 1,258 $ 291 $ 301,533 $ (211) $ 294,197  
Balance, Shares at Dec. 31, 2014   12,576 2,906        
Net earnings 10,363         10,363  
Unrealized gain on short-term investments 85       85    
Amortization of unearned stock-based compensation 1,719     1,719      
Issuance of non-voting common stock (upon vesting of restricted stock units) 16 $ 16          
Issuance of non-voting common stock (upon vesting of restricted stock units), shares   164          
Cancellation of restricted non-voting stock units for tax withholdings on vested shares (2,089) $ (7)   (2,082)      
Cancellation of restricted non-voting stock units for tax withholdings on vested shares, shares   (66)          
Purchase of treasury stock (135)           $ (135)
Other 24       24    
Balance at Mar. 31, 2015 607,051 $ 1,267 $ 291 301,170 (102) 304,560 $ (135)
Balance, Shares at Mar. 31, 2015   12,674 2,906        
Balance at Dec. 31, 2015 626,998 $ 1,269 $ 291 304,884 (567) 321,121  
Balance, Shares at Dec. 31, 2015   12,685 2,906        
Net earnings (8,932)         (8,932)  
Unrealized gain on short-term investments 476       476    
Changes in pension plan assets and benefit obligations 1       1    
Amortization of unearned stock-based compensation 1,485     1,485      
Issuance of non-voting common stock (upon vesting of restricted stock units) 12 $ 12          
Issuance of voting common stock (upon vesting of restricted stock units), shares   121          
Cancellation of restricted non-voting stock units for tax withholdings on vested shares (503) $ (3)   (500)      
Cancellation of restricted voting stock units for tax withholdings on vested shares, shares   (27)          
Retirement of Treasury Stock, Shares   (8)          
Balance at Mar. 31, 2016 $ 619,537 $ 1,278 $ 291 $ 305,869 $ (90) $ 312,189  
Balance, Shares at Mar. 31, 2016   12,771 2,906