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Consolidated 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, 2015 $ 1,203,721 $ 20,841 $ 602,522 $ (46,904) $ 495,276 $ (114,425) $ 246,411
Beginning balance (in shares) at Dec. 31, 2015   35,311,493          
Net income 235,983       182,810   53,173
Other comprehensive gain (loss) 5,583     3,374     2,209
Issuances of non-vested restricted shares of common stock (in shares)   183,144          
Issuances of non-vested restricted shares of common stock   $ 92 (92)        
Forfeitures of non-vested restricted shares of common stock (in shares)   (26,000)          
Forfeitures of non-vested restricted shares of common stock   $ (13) 13        
Common stock contribution to 401(k) plan 2,348 $ 10 2,338        
Common stock contribution to 401(k) plan (in shares)   20,045          
Stock issuances from exercise of stock options and employee stock purchase plan (in shares)   72,482          
Stock issuances from exercise of stock options and employee stock purchase plan 5,696 $ 36 5,660        
Retirement of common stock (in shares)   (30,761)          
Retirement of common stock (4,018) $ (15) (4,003)        
Share-based compensation 11,848   11,848        
Cash dividends declared and paid on Common and Class B common stock (127,604)       (127,604)    
Decrease in non-controlling interest in Carrier Enterprise II (42,909)   (25,936)       (16,973)
Distributions to non-controlling interest (38,900)           (38,900)
Ending balance at Dec. 31, 2016 1,251,748 $ 20,951 592,350 (43,530) 550,482 (114,425) 245,920
Ending balance (in shares) at Dec. 31, 2016   35,530,403          
Net income 257,290       208,221   49,069
Other comprehensive gain (loss) 14,918     9,309     5,609
Issuances of non-vested restricted shares of common stock (in shares)   176,899          
Issuances of non-vested restricted shares of common stock   $ 88 (88)        
Forfeitures of non-vested restricted shares of common stock (in shares)   (10,000)          
Forfeitures of non-vested restricted shares of common stock   $ (5) 5        
Common stock contribution to 401(k) plan 2,428 $ 8 2,420        
Common stock contribution to 401(k) plan (in shares)   16,389          
Stock issuances from exercise of stock options and employee stock purchase plan (in shares)   49,166          
Stock issuances from exercise of stock options and employee stock purchase plan 5,287 $ 24 5,263        
Retirement of common stock (in shares)   (32,804)          
Retirement of common stock (4,717) $ (16) (4,701)        
Share-based compensation 13,536   13,536        
Net proceeds from the sale of Common stock 247,433   220,448     26,985  
Net proceeds from the sale of Common stock (in shares)   1,498,662          
Cash dividends declared and paid on Common and Class B common stock (164,147)       (164,147)    
Investment in unconsolidated entity 12,720           12,720
Decrease in non-controlling interest in Carrier Enterprise II (42,688)   (25,225)       (17,463)
Distributions to non-controlling interest (42,831)           (42,831)
Ending balance at Dec. 31, 2017 1,550,977 $ 21,050 804,008 (34,221) 594,556 (87,440) 253,024
Ending balance (in shares) at Dec. 31, 2017   37,228,715          
Cumulative-effect adjustment at Dec. 31, 2017       301 (301)    
Net income 296,529       242,932   53,597
Other comprehensive gain (loss) (18,732)     (12,048)     (6,684)
Issuances of non-vested restricted shares of common stock (in shares)   142,865          
Issuances of non-vested restricted shares of common stock   $ 71 (71)        
Forfeitures of non-vested restricted shares of common stock (in shares)   (10,000)          
Forfeitures of non-vested restricted shares of common stock   $ (5) 5        
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)   64,423          
Stock issuances from exercise of stock options and employee stock purchase plan 7,852 $ 32 7,820        
Retirement of common stock (in shares)   (28,781)          
Retirement of common stock (5,044) $ (14) (5,030)        
Share-based compensation 15,631   15,631        
Cash dividends declared and paid on Common and Class B common stock (209,218)       (209,218)    
Common stock issued for Alert Labs Inc. (in shares)   47,103          
Common stock issued for Alert Labs Inc. 6,846 $ 24 6,822        
Investment in unconsolidated entity 752           752
Distributions to non-controlling interest (46,825)           (46,825)
Ending balance at Dec. 31, 2018 $ 1,601,713 $ 21,167 $ 832,121 $ (45,968) $ 627,969 $ (87,440) $ 253,864
Ending balance (in shares) at Dec. 31, 2018   37,461,643