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Condensed Consolidated Statements of Changes in Equity - USD ($)
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 $ 194,771,000 $ 52,110,000 $ 714,051,000 $ (59,099,000) $ 5,154,000 $ 906,987,000
Balance, shares at Dec. 31, 2019 109,337,781          
Net income     75,851,000   97,000 75,948,000
Other comprehensive loss       (5,108,000) 3,000 (5,105,000)
Comprehensive income     75,851,000 (5,108,000) 100,000 70,843,000
Stock option exercises $ 24,141,000 (4,716,000)       19,425,000
Stock option exercises, shares 679,277          
Issuance of common stock related to vesting of share units $ 3,513,000 (7,451,000)       (3,938,000)
Issuance of common stock related to vesting of share units, shares 138,791          
Stock option compensation expense   2,730,000       2,730,000
Equity-classified share unit expense   5,017,000       5,017,000
Equity-classified share units dividend equivalents   268,000 (268,000)      
Cash dividends paid     (43,586,000)     (43,586,000)
Shares repurchased $ (53,170,000)         (53,170,000)
Shares repurchased, shares (1,525,312)          
Balance at Jun. 30, 2020 $ 169,255,000 47,958,000 746,048,000 (64,207,000) 5,254,000 904,308,000
Balance, shares at Jun. 30, 2020 108,630,537          
Balance at Mar. 31, 2020 $ 153,801,000 46,147,000 714,816,000 (74,959,000) 5,166,000 844,971,000
Balance, shares at Mar. 31, 2020 108,198,739          
Net income     53,043,000   76,000 53,119,000
Other comprehensive loss       10,752,000 12,000 10,764,000
Comprehensive income     53,043,000 10,752,000 88,000 63,883,000
Stock option exercises $ 15,457,000 (3,086,000)       12,371,000
Stock option exercises, shares 431,831          
Issuance of common stock related to vesting of share units $ (3,000) (7,000)       (10,000)
Issuance of common stock related to vesting of share units, shares (33)          
Stock option compensation expense   1,543,000       1,543,000
Equity-classified share unit expense   3,231,000       3,231,000
Equity-classified share units dividend equivalents   130,000 (130,000)      
Cash dividends paid     (21,681,000)     (21,681,000)
Balance at Jun. 30, 2020 $ 169,255,000 47,958,000 746,048,000 (64,207,000) 5,254,000 904,308,000
Balance, shares at Jun. 30, 2020 108,630,537          
Balance at Dec. 31, 2020 $ 200,451,000 49,171,000 791,918,000 (34,295,000) 5,154,000 1,012,399,000
Balance, shares at Dec. 31, 2020 109,876,428          
Net income     88,937,000   (17,000) 88,920,000
Other comprehensive loss       (8,878,000) (14,000) (8,892,000)
Comprehensive income     88,937,000 (8,878,000) (31,000) 80,028,000
Stock option exercises $ 13,157,000 (2,458,000)       $ 10,699,000
Stock option exercises, shares 311,153         311,153
Issuance of common stock related to vesting of share units $ 2,058,000 (11,377,000)       $ (9,319,000)
Issuance of common stock related to vesting of share units, shares 234,737          
Share based continuing employment costs related to business combination $ (55,510) 5,231,000       5,231,000
Stock option compensation expense   3,770,000       3,770,000
Equity-classified share unit expense   7,182,000       7,182,000
Equity-classified share units dividend equivalents   281,000 (281,000)      
Cash dividends paid     (48,537,000)   (26,000) (48,563,000)
Balance at Jun. 30, 2021 $ 215,666,000 51,800,000 832,037,000 (43,173,000) 5,097,000 1,061,427,000
Balance, shares at Jun. 30, 2021 110,366,808          
Balance at Mar. 31, 2021 $ 210,765,000 43,612,000 795,781,000 (44,639,000) 5,089,000 1,010,608,000
Balance, shares at Mar. 31, 2021 110,253,056          
Net income     60,749,000   32,000 60,781,000
Other comprehensive loss       1,466,000 2,000 1,468,000
Comprehensive income     60,749,000 1,466,000 34,000 62,249,000
Stock option exercises $ 4,889,000 (910,000)       3,979,000
Stock option exercises, shares 113,290          
Issuance of common stock related to vesting of share units $ 12,000 (30,000)       (18,000)
Issuance of common stock related to vesting of share units, shares 462          
Share based continuing employment costs related to business combination   2,678,000       2,678,000
Stock option compensation expense   1,909,000       1,909,000
Equity-classified share unit expense   4,404,000       4,404,000
Equity-classified share units dividend equivalents   137,000 (137,000)      
Cash dividends paid     (24,356,000)   (26,000) (24,382,000)
Balance at Jun. 30, 2021 $ 215,666,000 $ 51,800,000 $ 832,037,000 $ (43,173,000) $ 5,097,000 $ 1,061,427,000
Balance, shares at Jun. 30, 2021 110,366,808