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Condensed Consolidated Unaudited Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock, Class B Common Stock and Preferred Stock
Paid-In Capital
Accumulated Other Comprehensive Loss
Retained Earnings
Treasury Stock
Non-controlling Interest
Beginning balance at Dec. 31, 2017 $ 1,550,977 $ 21,050 $ 804,008 $ (34,221) $ 594,556 $ (87,440) $ 253,024
Beginning balance (in shares) at Dec. 31, 2017   37,228,715          
Cumulative-effect adjustment at Dec. 31, 2017       301 (301)    
Net income 42,377       34,219   8,158
Other comprehensive income (loss) (5,741)     (3,649)     (2,092)
Issuances of non-vested restricted shares of common stock (in shares)   91,609          
Issuances of non-vested restricted shares of common stock   $ 46 (46)        
Forfeitures of non-vested restricted shares of common stock (in shares)   (3,000)          
Forfeitures of non-vested restricted shares of common stock   $ (2) 2        
Common stock contribution to 401(k) plan 2,945 $ 9 2,936        
Common stock contribution to 401(k) plan (in shares)   17,318          
Stock issuances from exercise of stock options and employee stock purchase plan (in shares)   37,130          
Stock issuances from exercise of stock options and employee stock purchase plan 4,341 $ 19 4,322        
Retirement of common stock (in shares)   (5,041)          
Retirement of common stock (914) $ (3) (911)        
Share-based compensation 4,400   4,400        
Cash dividends declared and paid on Common and Class B common stock (46,581)       (46,581)    
Distributions to non-controlling interest (2,178)           (2,178)
Ending balance at Mar. 31, 2018 1,549,626 $ 21,119 814,711 (37,569) 581,893 (87,440) 256,912
Ending balance (in shares) at Mar. 31, 2018   37,366,731          
Beginning balance at Dec. 31, 2018 1,601,713 $ 21,167 832,121 (45,968) 627,969 (87,440) 253,864
Beginning balance (in shares) at Dec. 31, 2018   37,461,643          
Net income 43,804       35,037   8,767
Other comprehensive income (loss) 4,195     2,783     1,412
Issuances of non-vested restricted shares of common stock (in shares)   77,049          
Issuances of non-vested restricted shares of common stock   $ 39 (39)        
Forfeitures of non-vested restricted shares of common stock (in shares)   (5,000)          
Forfeitures of non-vested restricted shares of common stock   $ (3) 3        
Common stock contribution to 401(k) plan 4,274 $ 15 4,259        
Common stock contribution to 401(k) plan (in shares)   30,715          
Stock issuances from exercise of stock options and employee stock purchase plan (in shares)   8,925          
Stock issuances from exercise of stock options and employee stock purchase plan 1,125 $ 4 1,121        
Retirement of common stock (in shares)   (2,985)          
Retirement of common stock (428) $ (1) (427)        
Share-based compensation 4,537   4,537        
Cash dividends declared and paid on Common and Class B common stock (59,965)       (59,965)    
Ending balance at Mar. 31, 2019 $ 1,599,255 $ 21,221 $ 841,575 $ (43,185) $ 603,041 $ (87,440) $ 264,043
Ending balance (in shares) at Mar. 31, 2019   37,570,347