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Condensed Consolidated Statements of Stockholders' Equity Statement - USD ($) $ in Thousands | Total | Common Stock Shares [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Treasury Stock [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Common stock, shares outstanding at Dec. 31, 2019 |  | 20,742,000 |  |  |  |  |
Stockholders' Equity Attributable to Parent at Dec. 31, 2019 | $ 1,377,244 |  | $ 2,074 | $ 668,947 | $ (157) | $ 721,782 | $ (15,402)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 155,000 |  |  |  |  |
Stock Issued During Period, Value, New Issues | 560 |  | 9 |  | 10,758 |  |
Adjustments to Additional Paid in Capital, Other |  |  |  | (10,207) |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  | (64,000) |  |  |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | (12,174) |  |  |  | (12,174) |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 6,939 |  |  | 6,939 |  |  |
Other Comprehensive (Loss) Income, Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | (13,510) |  |  |  |  |  |
Net Income Attributable to Parent | 16,834 |  |  |  |  | 16,834 |
Stockholders' Equity Attributable to Parent at Mar. 31, 2020 | 1,375,893 |  | 2,083 | 665,679 | (1,573) | 738,616 | (28,912)
Common stock, shares outstanding at Mar. 31, 2020 |  | 20,833,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Other Comprehensive income (loss), net of Tax | (13,510) |  |  |  |  |  | (13,510)
Common stock, shares outstanding at Dec. 31, 2019 |  | 20,742,000 |  |  |  |  |
Stockholders' Equity Attributable to Parent at Dec. 31, 2019 | $ 1,377,244 |  | 2,074 | 668,947 | (157) | 721,782 | (15,402)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation | (66,749) |  |  |  |  |  |
Stockholders' Equity Attributable to Parent at Sep. 30, 2020 | $ 1,452,220 |  | 2,097 | 683,326 | (180) | 782,510 | (15,533)
Common stock, shares outstanding at Sep. 30, 2020 |  | 20,969,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Other Comprehensive income (loss), net of Tax | (131) |  |  |  |  |  |
Common stock, shares outstanding at Mar. 31, 2020 |  | 20,833,000 |  |  |  |  |
Stockholders' Equity Attributable to Parent at Mar. 31, 2020 | 1,375,893 |  | 2,083 | 665,679 | (1,573) | 738,616 | (28,912)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 106,000 |  |  |  |  |
Stock Issued During Period, Value, New Issues | 6,239 |  | 11 |  | 1,820 |  |
Adjustments to Additional Paid in Capital, Other |  |  |  | 4,408 |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  | (2,000) |  |  |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | (387) |  |  |  | (387) |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 5,410 |  |  | 5,410 |  |  |
Other Comprehensive (Loss) Income, Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | 5,734 |  |  |  |  |  |
Net Income Attributable to Parent | 18,908 |  |  |  |  | 18,908 |
Stockholders' Equity Attributable to Parent at Jun. 30, 2020 | 1,411,797 |  | 2,094 | 675,497 | (140) | 757,524 | (23,178)
Common stock, shares outstanding at Jun. 30, 2020 |  | 20,937,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Other Comprehensive income (loss), net of Tax | 5,734 |  |  |  |  |  | 5,734
Stock Issued During Period, Shares, New Issues |  | 33,000 |  |  |  |  |
Stock Issued During Period, Value, New Issues | 1,787 |  | 3 |  | 220 |  |
Adjustments to Additional Paid in Capital, Other |  |  |  | 1,564 |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  | (1,000) |  |  |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | (260) |  |  |  | (260) |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 6,265 |  |  | 6,265 |  |  |
Other Comprehensive (Loss) Income, Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | 7,645 |  |  |  |  |  |
Net Income Attributable to Parent | 24,986 |  |  |  |  | 24,986 |
Stockholders' Equity Attributable to Parent at Sep. 30, 2020 | 1,452,220 |  | 2,097 | 683,326 | (180) | 782,510 | (15,533)
Common stock, shares outstanding at Sep. 30, 2020 |  | 20,969,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Other Comprehensive income (loss), net of Tax | $ 7,645 |  |  |  |  |  | 7,645
Common stock, shares outstanding at Dec. 31, 2020 | 21,058,000 | 21,058,000 |  |  |  |  |
Stockholders' Equity Attributable to Parent at Dec. 31, 2020 | $ 1,502,265 |  | 2,106 | 693,068 | (39) | 808,652 | (1,522)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 198,000 |  |  |  |  |
Stock Issued During Period, Value, New Issues | 4,864 |  | 16 |  | 2,352 |  |
Adjustments to Additional Paid in Capital, Other |  |  |  | 2,496 |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  | (37,000) |  |  |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | (7,723) |  |  |  | (7,723) |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 6,022 |  |  | 6,022 |  |  |
Other Comprehensive (Loss) Income, Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | (8,391) |  |  |  |  |  |
Net Income Attributable to Parent | 23,731 |  |  |  |  | 23,731 |
Stockholders' Equity Attributable to Parent at Mar. 31, 2021 | 1,520,768 |  | 2,122 | 701,586 | (5,410) | 832,383 | (9,913)
Common stock, shares outstanding at Mar. 31, 2021 |  | 21,219,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Other Comprehensive income (loss), net of Tax | $ (8,391) |  |  |  |  |  | (8,391)
Common stock, shares outstanding at Dec. 31, 2020 | 21,058,000 | 21,058,000 |  |  |  |  |
Stockholders' Equity Attributable to Parent at Dec. 31, 2020 | $ 1,502,265 |  | 2,106 | 693,068 | (39) | 808,652 | (1,522)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation | (39,371) |  |  |  |  |  |
Stockholders' Equity Attributable to Parent at Sep. 30, 2021 | $ 1,589,972 |  | 2,124 | 711,152 | (48) | 891,862 | (15,118)
Common stock, shares outstanding at Sep. 30, 2021 | 21,238,000 | 21,238,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Other Comprehensive income (loss), net of Tax | $ (13,596) |  |  |  |  |  |
Common stock, shares outstanding at Mar. 31, 2021 |  | 21,219,000 |  |  |  |  |
Stockholders' Equity Attributable to Parent at Mar. 31, 2021 | 1,520,768 |  | 2,122 | 701,586 | (5,410) | 832,383 | (9,913)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 0 |  |  |  |  |
Stock Issued During Period, Value, New Issues | 552 |  | 0 |  | 3,237 |  |
Adjustments to Additional Paid in Capital, Other |  |  |  | (2,685) |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  | 0 |  |  |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | (96) |  |  |  | (96) |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 6,681 |  |  | 6,681 |  |  |
Other Comprehensive (Loss) Income, Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | 962 |  |  |  |  |  |
Net Income Attributable to Parent | 28,398 |  |  |  |  | 28,398 |
Stockholders' Equity Attributable to Parent at Jun. 30, 2021 | 1,557,265 |  | 2,122 | 705,582 | (2,269) | 860,781 | (8,951)
Common stock, shares outstanding at Jun. 30, 2021 |  | 21,219,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Other Comprehensive income (loss), net of Tax | 962 |  |  |  |  |  | 962
Stock Issued During Period, Shares, New Issues |  | 20,000 |  |  |  |  |
Stock Issued During Period, Value, New Issues | 1,550 |  | 2 |  | 2,511 |  |
Adjustments to Additional Paid in Capital, Other |  |  |  | (963) |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  | (1,000) |  |  |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | (290) |  |  |  | (290) |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 6,533 |  |  | 6,533 |  |  |
Other Comprehensive (Loss) Income, Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | (6,167) |  |  |  |  |  |
Net Income Attributable to Parent | 31,081 |  |  |  |  | 31,081 |
Stockholders' Equity Attributable to Parent at Sep. 30, 2021 | $ 1,589,972 |  | $ 2,124 | $ 711,152 | $ (48) | $ 891,862 | (15,118)
Common stock, shares outstanding at Sep. 30, 2021 | 21,238,000 | 21,238,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Other Comprehensive income (loss), net of Tax | $ (6,167) |  |  |  |  |  | $ (6,167)

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