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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
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
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           36,608    
Number at Dec. 31, 2014         3,064,815 16,331,577   12,061,370
Balance at Dec. 31, 2013   $ 516,653 $ 54,028 $ 403,861 $ (101,265) $ 2   $ 1
Other comprehensive income (loss):                
Change in unrealized holding gains (losses)     (30,299)          
Change in other than temporary impairment losses recognized in other comprehensive income     (4)          
Unrealized foreign currency translation gains (losses)     (341)          
Other comprehensive income (loss), net of taxes     (30,644)          
A ordinary shares purchased, at cost             $ (139)  
Share compensation plans   2,900            
Net income       62,856        
Tax benefit on share-based compensation expense   37            
Balance at Dec. 31, 2014 $ 908,290 519,590 23,384 466,717 $ (101,404) $ 2   $ 1
Ordinary shares issued under share incentive plans           124,482    
A ordinary shares purchased             11,895  
Ordinary shares issued to directors           18,045    
Ordinary shares issued in connection with American Reliable Acquisition           267,702    
Number at Jun. 30, 2015         3,076,710 16,741,806   12,061,370
Other comprehensive income (loss):                
Change in unrealized holding gains (losses)     (3,441)          
Change in other than temporary impairment losses recognized in other comprehensive income     (5)          
Unrealized foreign currency translation gains (losses) 164   164          
Other comprehensive income (loss), net of taxes (3,282)   (3,282)          
A ordinary shares purchased, at cost             $ (333)  
Share compensation plans   8,611            
Net income 17,911     17,911        
Tax benefit on share-based compensation expense   58            
Balance at Jun. 30, 2015 $ 931,255 $ 528,259 $ 20,102 $ 484,628 $ (101,737) $ 2   $ 1