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Consolidated Statements of Changes in Equity - USD ($)
$ in Thousands
Common stock [Member]
Additional paid-in capital ("APIC") [Member]
Retained earnings [Member]
Accumulated other comprehensive loss [Member]
Non-controlling interest ("NCI") [Member]
Contingently Redeemable Performance Share Units [Member]
Total
Balance at Dec. 31, 2018 $ 181,780 $ 56,885 $ 648,255 $ (56,277) $ 5,067 $ 923 $ 835,710
Balance, shares at Dec. 31, 2018 108,682,030            
Net income     149,039   101   149,140
Other comprehensive income (loss)       (2,822) (14)    
Other comprehensive income (loss)             (2,836)
Comprehensive income     149,039 (2,822) 87   146,304
Stock option exercises $ 49,117 (8,023)         41,094
Stock option exercises, shares 1,672,022            
Issuance of common stock related to vesting of share units $ 5,886 (10,064) 1     (1,083) (4,177)
Issuance of common stock related to vesting of share units, shares 207,403            
Stock option compensation expense   4,697         4,697
Equity-classified share unit expense   7,933       114 7,933
Equity-classified share units dividend equivalents   682 (709)     $ 46 (27)
Cash dividends paid     (82,535)       (82,535)
Shares repurchased $ (42,012)           (42,012)
Shares repurchased, shares (1,223,674)            
Balance at Dec. 31, 2019 $ 194,771 52,110 714,051 (59,099) 5,154   906,987
Balance, shares at Dec. 31, 2019 109,337,781            
Net income     170,095   263   170,358
Other comprehensive income (loss)       24,804 57    
Other comprehensive income (loss)             24,861
Comprehensive income     170,095 24,804 320   195,219
Stock option exercises $ 55,669 (11,541)         44,128
Stock option exercises, shares 1,563,941            
Issuance of common stock related to vesting of share units $ 3,181 (9,900)         (6,719)
Issuance of common stock related to vesting of share units, shares 187,825            
Issuance of common stock related to business combination   1,459         1,459
Issuance of common stock related to business combination, shares 312,193            
Share based continuing employment costs related to business combination   802         802
Stock option compensation expense   5,853         5,853
Equity-classified share unit expense   9,897         9,897
Equity-classified share units dividend equivalents   491 (491)        
Cash dividends paid     (91,737)   (320)   (92,057)
Shares repurchased $ (53,170)           (53,170)
Shares repurchased, shares (1,525,312)            
Balance at Dec. 31, 2020 $ 200,451 49,171 791,918 (34,295) 5,154   1,012,399
Balance, shares at Dec. 31, 2020 109,876,428            
Net income     151,868   (14)   151,854
Other comprehensive income (loss)       (21,678) (34)    
Other comprehensive income (loss)             (21,712)
Comprehensive income     151,868 (21,678) (48)   130,142
Stock option exercises $ 20,013 (3,763)         16,250
Stock option exercises, shares 495,021            
Issuance of common stock related to vesting of share units $ 2,276 (11,724)         (9,448)
Issuance of common stock related to vesting of share units, shares 238,139            
Forfeiture of common stock related to business combination   (98)         (98)
Forfeiture of common stock related to business combination, shares (55,510)            
Issuance of common stock related to business combination, shares 63,971            
Share based continuing employment costs related to business combination $ 4,764 6,105         10,869
Stock option compensation expense   8,365         8,365
Equity-classified share unit expense   12,199         12,199
Equity-classified share units dividend equivalents   450 (450)        
Acquisition of remaining interest in NCI   (1,170) 70   (4,614)   (5,714)
Cash dividends paid     (103,797)   (104)   (103,901)
Balance at Dec. 31, 2021 $ 227,504 $ 59,535 $ 839,609 $ (55,973) $ 388   $ 1,071,063
Balance, shares at Dec. 31, 2021 110,618,049