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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   $ 46 (46)        
Issuances of non-vested restricted shares of common stock (in shares)   91,609          
Forfeitures of non-vested restricted shares of common stock   $ (2) 2        
Forfeitures of non-vested restricted shares of common stock (in shares)   (3,000)          
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 4,341 $ 19 4,322        
Stock issuances from exercise of stock options and employee stock purchase plan (in shares)   37,130          
Retirement of common stock (914) $ (3) (911)        
Retirement of common stock (in shares)   (5,041)          
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, 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 150,641            
Other comprehensive income (loss) (10,302)            
Ending balance at Jun. 30, 2018 1,601,994 $ 21,120 817,559 (40,459) 617,666 (87,440) 273,548
Ending balance (in shares) at Jun. 30, 2018   37,367,632          
Beginning balance at Mar. 31, 2018 1,549,626 $ 21,119 814,711 (37,569) 581,893 (87,440) 256,912
Beginning balance (in shares) at Mar. 31, 2018   37,366,731          
Net income 108,264       89,957   18,307
Other comprehensive income (loss) (4,561)     (2,890)     (1,671)
Issuances of non-vested restricted shares of common stock   $ 4 (4)        
Issuances of non-vested restricted shares of common stock (in shares)   8,500          
Forfeitures of non-vested restricted shares of common stock   $ (2) 2        
Forfeitures of non-vested restricted shares of common stock (in shares)   (5,000)          
Stock issuances from exercise of stock options and employee stock purchase plan 1,601 $ 6 1,595        
Stock issuances from exercise of stock options and employee stock purchase plan (in shares)   11,935          
Retirement of common stock (2,499) $ (7) (2,492)        
Retirement of common stock (in shares)   (14,534)          
Share-based compensation 3,747   3,747        
Cash dividends declared and paid on Common and Class B common stock (54,184)       (54,184)    
Ending balance at Jun. 30, 2018 1,601,994 $ 21,120 817,559 (40,459) 617,666 (87,440) 273,548
Ending balance (in shares) at Jun. 30, 2018   37,367,632          
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   $ 39 (39)        
Issuances of non-vested restricted shares of common stock (in shares)   77,049          
Forfeitures of non-vested restricted shares of common stock   $ (3) 3        
Forfeitures of non-vested restricted shares of common stock (in shares)   (5,000)          
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 1,125 $ 4 1,121        
Stock issuances from exercise of stock options and employee stock purchase plan (in shares)   8,925          
Retirement of common stock (428) $ (1) (427)        
Retirement of common stock (in shares)   (2,985)          
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          
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 151,714            
Other comprehensive income (loss) 8,847            
Ending balance at Jun. 30, 2019 1,633,362 $ 21,266 828,932 (40,146) 632,983 (87,440) 277,767
Ending balance (in shares) at Jun. 30, 2019   37,659,852          
Beginning balance at Mar. 31, 2019 1,599,255 $ 21,221 841,575 (43,185) 603,041 (87,440) 264,043
Beginning balance (in shares) at Mar. 31, 2019   37,570,347          
Net income 107,910       90,155   17,755
Other comprehensive income (loss) 4,652     3,039     1,613
Issuances of non-vested restricted shares of common stock   $ 13 (13)        
Issuances of non-vested restricted shares of common stock (in shares)   26,354          
Stock issuances from exercise of stock options and employee stock purchase plan 1,951 $ 9 1,942        
Stock issuances from exercise of stock options and employee stock purchase plan (in shares)   15,807          
Retirement of common stock (555) $ (2) (553)        
Retirement of common stock (in shares)   (3,608)          
Share-based compensation 4,324   4,324        
Cash dividends declared and paid on Common and Class B common stock (60,213)       (60,213)    
Common stock issued for Dunphey & Associates Supply Co., Inc. 7,450 $ 25 7,425        
Common stock issued for Dunphey & Associates Supply Co., Inc. (in shares)   50,952          
Investment in unconsolidated entity 988           988
Decrease in non-controlling interest in Carrier Enterprise II (32,400)   (25,768)       (6,632)
Ending balance at Jun. 30, 2019 $ 1,633,362 $ 21,266 $ 828,932 $ (40,146) $ 632,983 $ (87,440) $ 277,767
Ending balance (in shares) at Jun. 30, 2019   37,659,852