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Condensed 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]
Total
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     121,239   199 121,438
Other comprehensive income (loss)       7,415 30 7,445
Comprehensive income     121,239 7,415 229 128,883
Stock option exercises $ 50,611 (10,417)       40,194
Stock option exercises, shares 1,430,545          
Issuance of common stock related to vesting of share units $ 3,515 (7,459)       (3,944)
Issuance of common stock related to vesting of share units, shares 138,877          
Stock option compensation expense   4,401       4,401
Equity-classified share unit expense   9,155       9,155
Equity-classified share units dividend equivalents   463 (463)      
Cash dividends paid     (67,639)     (67,639)
Shares repurchased $ (53,170)         (53,170)
Shares repurchased, shares (1,525,312)          
Balance at Sep. 30, 2020 $ 195,727 48,253 767,188 (51,684) 5,383 964,867
Balance, shares at Sep. 30, 2020 109,381,891          
Balance at Jun. 30, 2020 $ 169,255 47,958 746,048 (64,207) 5,254 904,308
Balance, shares at Jun. 30, 2020 108,630,537          
Net income     45,387   103 45,490
Other comprehensive income (loss)       12,523 26 12,549
Comprehensive income     45,387 12,523 129 58,039
Stock option exercises $ 26,470 (5,701)       20,769
Stock option exercises, shares 751,268          
Issuance of common stock related to vesting of share units $ 2 (7)       (5)
Issuance of common stock related to vesting of share units, shares 86          
Stock option compensation expense   1,671       1,671
Equity-classified share unit expense   4,138       4,138
Equity-classified share units dividend equivalents   194 (194)      
Cash dividends paid     (24,053)     (24,053)
Balance at Sep. 30, 2020 $ 195,727 48,253 767,188 (51,684) 5,383 964,867
Balance, shares at Sep. 30, 2020 109,381,891          
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     121,273   4 121,277
Other comprehensive income (loss)       (17,727) (24) (17,751)
Comprehensive income     121,273 (17,727) (20) 103,526
Stock option exercises $ 17,099 (3,184)       13,915
Stock option exercises, shares 411,856          
Issuance of common stock related to vesting of share units $ 2,059 (11,384)       (9,325)
Issuance of common stock related to vesting of share units, shares 234,822          
Share based continuing employment costs related to business combination   7,938       7,938
Shares forfeited (55,510)          
Stock option compensation expense   5,903       5,903
Equity-classified share unit expense   9,465       9,465
Equity-classified share units dividend equivalents   358 (358)      
Acquisition of remaining interest in NCI   (672) 70   (4,614) (5,216)
Cash dividends paid     (76,144)   (104) (76,248)
Balance at Sep. 30, 2021 $ 219,609 57,595 836,759 (52,022) 416 1,062,357
Balance, shares at Sep. 30, 2021 110,467,596          
Balance at Jun. 30, 2021 $ 215,666 51,800 832,037 (43,173) 5,097 1,061,427
Balance, shares at Jun. 30, 2021 110,366,808          
Net income     32,336   21 32,357
Other comprehensive income (loss)       (8,849) (10) (8,859)
Comprehensive income     32,336 (8,849) 11 23,498
Stock option exercises $ 3,942 (725)       3,217
Stock option exercises, shares 100,703          
Issuance of common stock related to vesting of share units $ 1 (7)       (6)
Issuance of common stock related to vesting of share units, shares 85          
Share based continuing employment costs related to business combination   2,707       2,707
Stock option compensation expense   2,133       2,133
Equity-classified share unit expense   2,283       2,283
Equity-classified share units dividend equivalents   76 (76)      
Acquisition of remaining interest in NCI   (672) 69   (4,692) (5,295)
Cash dividends paid     (27,607)     (27,607)
Balance at Sep. 30, 2021 $ 219,609 $ 57,595 $ 836,759 $ (52,022) $ 416 $ 1,062,357
Balance, shares at Sep. 30, 2021 110,467,596