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Consolidated Statements of Changes in Shareholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Additional Paid-in Capital
Accumulated other comprehensive income, net of deferred income tax
Retained Earnings
Treasury Shares
Ordinary Shares A
Ordinary Shares A
Treasury Shares
Ordinary Shares B
Balance at Dec. 31, 2012   $ 512,304 $ 53,350 $ 342,171 $ (101,210) $ 2   $ 1
Number at Dec. 31, 2012         3,057,001 16,087,939   12,061,370
Ordinary shares issued under share incentive plans           74,400    
A ordinary shares purchased             2,370  
Ordinary shares issued to directors           38,067    
Other comprehensive income (loss):                
Change in unrealized holding gains (losses)     514          
Change in other than temporary impairment losses recognized in other comprehensive income     1          
Unrealized foreign currency translation gains (losses)     163          
Other comprehensive income (loss), net of taxes     678          
A ordinary shares purchased, at cost             (55)  
Share compensation plans   4,349            
Net income       61,690        
Balance at Dec. 31, 2013 873,280 516,653 54,028 403,861 (101,265) 2   1
Number at Dec. 31, 2013         3,059,371 16,200,406   12,061,370
Ordinary shares issued under share incentive plans           94,563    
A ordinary shares purchased             5,444  
Ordinary shares issued to directors           27,676    
Other comprehensive income (loss):                
Change in unrealized holding gains (losses)     (28,836)          
Change in other than temporary impairment losses recognized in other comprehensive income     (4)          
Unrealized foreign currency translation gains (losses) (234)   (234)          
Other comprehensive income (loss), net of taxes (29,074)   (29,074)          
A ordinary shares purchased, at cost             (139)  
Share compensation plans   2,236            
Net income 51,792     51,792        
Balance at Sep. 30, 2014 $ 898,095 $ 518,889 $ 24,954 $ 455,653 $ (101,404) $ 2   $ 1
Number at Sep. 30, 2014         3,064,815 16,322,645   12,061,370