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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income
Retained Earnings
Non-controlling Interest
Total
Beginning Balance at Dec. 31, 2018 $ 38 $ 97,418 $ (3,449) $ 512,783 $ 512 $ 607,302
Beginning Balance (in shares) at Dec. 31, 2018 38,164          
Stock issued from equity plans   (1,707)       (1,707)
Stock issued from equity plans (in shares) 72          
Stock-based compensation   3,199       3,199
Other comprehensive income (loss)     (2,028)     (2,028)
Net income       15,370 8 15,378
Ending Balance at Mar. 31, 2019 $ 38 98,910 (5,477) 528,153 520 622,144
Ending Balance (in shares) at Mar. 31, 2019 38,236          
Beginning Balance at Dec. 31, 2018 $ 38 97,418 (3,449) 512,783 512 607,302
Beginning Balance (in shares) at Dec. 31, 2018 38,164          
Net income           54,706
Ending Balance at Sep. 30, 2019 $ 38 101,757 (9,628) 567,460 541 660,168
Ending Balance (in shares) at Sep. 30, 2019 38,332          
Beginning Balance at Mar. 31, 2019 $ 38 98,910 (5,477) 528,153 520 622,144
Beginning Balance (in shares) at Mar. 31, 2019 38,236          
Stock issued from equity plans   665       665
Stock issued from equity plans (in shares) 69          
Stock-based compensation   937       937
Other comprehensive income (loss)     606     606
Net income       31,686 11 31,697
Ending Balance at Jun. 30, 2019 $ 38 100,512 (4,871) 559,839 531 656,049
Ending Balance (in shares) at Jun. 30, 2019 38,305          
Stock issued from equity plans   328       328
Stock issued from equity plans (in shares) 27          
Stock-based compensation   917       917
Other comprehensive income (loss)     (4,757)     (4,757)
Net income       7,621 10 7,631
Ending Balance at Sep. 30, 2019 $ 38 101,757 (9,628) 567,460 541 660,168
Ending Balance (in shares) at Sep. 30, 2019 38,332          
Adoption of new accounting standards       (102)   (102)
Beginning Balance at Dec. 31, 2019 $ 38 104,849 (5,897) 577,724 546 $ 677,260
Beginning Balance (in shares) at Dec. 31, 2019 38,358         38,358
Stock issued from equity plans   (2,171)       $ (2,171)
Stock issued from equity plans (in shares) 64          
Stock-based compensation   3,048       3,048
Stock buyback   (7,248)       (7,248)
Stock buyback (in shares) (170)          
Other comprehensive income (loss)     (2,907)     (2,907)
Net income       18,063 15 18,078
Ending Balance at Mar. 31, 2020 $ 38 98,478 (8,804) 595,685 561 685,958
Ending Balance (in shares) at Mar. 31, 2020 38,252          
Beginning Balance at Dec. 31, 2019 $ 38 104,849 (5,897) 577,724 546 $ 677,260
Beginning Balance (in shares) at Dec. 31, 2019 38,358         38,358
Stock buyback           $ (11,579)
Net income           92,869
Ending Balance at Sep. 30, 2020 $ 38 101,485 (3,827) 670,456 581 $ 768,733
Ending Balance (in shares) at Sep. 30, 2020 38,272         38,272
Beginning Balance at Mar. 31, 2020 $ 38 98,478 (8,804) 595,685 561 $ 685,958
Beginning Balance (in shares) at Mar. 31, 2020 38,252          
Stock issued from equity plans   779       779
Stock issued from equity plans (in shares) 73          
Stock-based compensation   2,837       2,837
Other comprehensive income (loss)     (344)     (344)
Net income       29,144 (16) 29,128
Ending Balance at Jun. 30, 2020 $ 38 102,094 (9,148) 624,829 545 718,358
Ending Balance (in shares) at Jun. 30, 2020 38,325          
Stock issued from equity plans   (59)       (59)
Stock issued from equity plans (in shares) 20          
Stock-based compensation   3,781       3,781
Stock buyback   (4,331)       (4,331)
Stock buyback (in shares) (73)          
Other comprehensive income (loss)     5,321     5,321
Net income       45,627 36 45,663
Ending Balance at Sep. 30, 2020 $ 38 $ 101,485 $ (3,827) $ 670,456 $ 581 $ 768,733
Ending Balance (in shares) at Sep. 30, 2020 38,272         38,272