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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional paid-in capital
Accumulated other comprehensive loss
Accumulated deficit
Beginning balance (in shares) at Dec. 31, 2020   272,154,504      
Beginning balance at Dec. 31, 2020 $ 341,599 $ 2,722 $ 741,113 $ (26,233) $ (376,003)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 54,611       54,611
Other comprehensive loss (55,647)     (55,647)  
Acquisition option exercises, net (in shares)   3,141,342      
Acquisition option exercises, net 182,390 $ 31 182,359    
Purchase of capped call options, net of tax (39,021)   (39,021)    
Dividends declared (25,076)       (25,076)
Shares issued in connection with deferred compensation plan, net (in shares)   2,290,999      
Shares issued in connection with deferred compensation plan, net (65,684) $ 23     (65,707)
Deferred compensation plan elective participant deferrals 2,020   2,020    
Deferred compensation plan modification (4,739)   (4,739)    
Shares issued in connection with Executive Bonus Plan, net (in shares)   190,619      
Shares issued in connection with Executive Bonus Plan, net 9,429 $ 2 16,013   (6,586)
Shares issued in connection with employee stock purchase plan (in shares)   104,716      
Shares issued in connection with employee stock purchase plan 3,408 $ 1 3,845   (438)
Stock option exercises, net (in shares)   4,269,335      
Stock option exercises, net (29,949) $ 42 4,987   (34,978)
Shares issued for stock grants, net (in shares)   7,824      
Shares issued for stock grants, net 450   450    
Stock-based compensation expense 14,383   14,383    
Shares related to restricted stock, net (in shares)   (120,775)      
Shares related to restricted stock, net (6,353) $ (1)     (6,352)
Ending balance (in shares) at Sep. 30, 2021   282,038,564      
Ending balance at Sep. 30, 2021 381,821 $ 2,820 921,410 (81,880) (460,529)
Beginning balance (in shares) at Jun. 30, 2021   281,189,127      
Beginning balance at Jun. 30, 2021 472,531 $ 2,812 910,951 (54,886) (386,346)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) (48,022)       (48,022)
Other comprehensive loss (26,994)     (26,994)  
Dividends declared (8,485)       (8,485)
Shares issued in connection with deferred compensation plan, net (in shares)   88,920      
Shares issued in connection with deferred compensation plan, net (3,772) $ 1     (3,773)
Deferred compensation plan elective participant deferrals 527   527    
Deferred compensation plan modification (4,739)   (4,739)    
Shares issued in connection with Executive Bonus Plan, net (in shares)   41,172      
Shares issued in connection with Executive Bonus Plan, net 2,422   4,292   (1,870)
Shares issued in connection with employee stock purchase plan (in shares)   104,716      
Shares issued in connection with employee stock purchase plan 3,408 $ 1 3,845   (438)
Stock option exercises, net (in shares)   612,277      
Stock option exercises, net (5,246) $ 6 699   (5,951)
Stock-based compensation expense 5,835   5,835    
Shares related to restricted stock, net (in shares)   2,352      
Shares related to restricted stock, net (5,644)       (5,644)
Ending balance (in shares) at Sep. 30, 2021   282,038,564      
Ending balance at Sep. 30, 2021 381,821 $ 2,820 921,410 (81,880) (460,529)
Beginning balance (in shares) at Dec. 31, 2021   282,526,719      
Beginning balance at Dec. 31, 2021 409,222 $ 2,825 937,805 (91,774) (439,634)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 149,058       149,058
Other comprehensive loss (10,155)     (10,155)  
Acquisition option exercises, net (in shares)   185,178      
Acquisition option exercises, net 0 $ 2 (2)    
Dividends declared (25,623)       (25,623)
Shares issued in connection with deferred compensation plan, net (in shares)   3,523,386      
Shares issued in connection with deferred compensation plan, net (24,246) $ 35 (27)   (24,254)
Deferred compensation plan elective participant deferrals 4,694   4,694    
Shares issued in connection with Executive Bonus Plan, net (in shares)   284,992      
Shares issued in connection with Executive Bonus Plan, net 11,113 $ 3 16,307   (5,197)
Shares issued in connection with employee stock purchase plan (in shares)   307,406      
Shares issued in connection with employee stock purchase plan $ 10,062 $ 3 10,332   (273)
Stock option exercises, net (in shares) 900,000 2,272,603      
Stock option exercises, net $ (1,604) $ 23 6,832   (8,459)
Shares issued for stock grants, net (in shares)   13,632      
Shares issued for stock grants, net 450   450    
Stock-based compensation expense 28,687   28,687    
Shares related to restricted stock, net (in shares)   199,975      
Shares related to restricted stock, net (3,209) $ 2 (3)   (3,208)
Repurchase of Class B Common Stock under approved program (in shares)   (896,126)      
Repurchase of Class B Common Stock under approved program (28,250) $ (9)     (28,241)
Ending balance (in shares) at Sep. 30, 2022   288,417,765      
Ending balance at Sep. 30, 2022 520,199 $ 2,884 1,005,075 (101,929) (385,831)
Beginning balance (in shares) at Jun. 30, 2022   288,154,159      
Beginning balance at Jun. 30, 2022 496,993 $ 2,882 981,203 (89,131) (397,961)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 36,997       36,997
Other comprehensive loss (12,798)     (12,798)  
Dividends declared (8,592)       (8,592)
Shares issued in connection with deferred compensation plan, net (in shares)   97,591      
Shares issued in connection with deferred compensation plan, net 0 $ 1 (1)    
Deferred compensation plan elective participant deferrals 1,586   1,586    
Shares issued in connection with Executive Bonus Plan, net (in shares)   125,195      
Shares issued in connection with Executive Bonus Plan, net 4,417 $ 1 4,416   0
Shares issued in connection with employee stock purchase plan (in shares)   197,657      
Shares issued in connection with employee stock purchase plan 5,572 $ 2 5,722   (152)
Stock option exercises, net (in shares)   218,018      
Stock option exercises, net 935 $ 2 992   (59)
Stock-based compensation expense 11,158   11,158    
Shares related to restricted stock, net (in shares)   58,270      
Shares related to restricted stock, net (1,061)   (1)   (1,060)
Repurchase of Class B Common Stock under approved program (in shares)   (433,125)      
Repurchase of Class B Common Stock under approved program (15,008) $ (4)     (15,004)
Ending balance (in shares) at Sep. 30, 2022   288,417,765      
Ending balance at Sep. 30, 2022 $ 520,199 $ 2,884 $ 1,005,075 $ (101,929) $ (385,831)