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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]
--- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 6,330 |  |  |  |  | $ 6,330 |
Common stock, shares outstanding at Dec. 31, 2017 |  | 20,210,000 |  |  |  |  |
Stockholders' Equity Attributable to Parent at Dec. 31, 2017 | 1,198,254 |  | $ 2,021 | $ 625,568 | $ 0 | 585,624 | $ (14,959)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 130,000 |  |  |  |  |
Stock Issued During Period, Value, New Issues | 3,155 |  | 11 | 982 | 2,162 |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  | (23,000) |  |  |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | (5,338) |  |  |  | (5,338) |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 5,462 |  |  | 5,462 |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | 17,213 |  |  |  |  |  | 17,213
Net Income (Loss) Attributable to Parent | 4,875 |  |  |  |  | 4,875 |
Stockholders' Equity Attributable to Parent at Mar. 31, 2018 | 1,229,951 |  | 2,032 | 632,012 | (3,176) | 596,829 | 2,254
Common stock, shares outstanding at Mar. 31, 2018 |  | 20,317,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 143,000 |  |  |  |  |
Stock Issued During Period, Value, New Issues | 9,382 |  | 14 | 6,080 | 3,288 |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  | 0 |  |  |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | (132) |  |  |  | (132) |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 6,297 |  |  | 6,297 |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | (19,484) |  |  |  |  |  | (19,484)
Net Income (Loss) Attributable to Parent | 31,054 |  |  |  |  | 31,054 |
Stockholders' Equity Attributable to Parent at Jun. 30, 2018 | 1,257,068 |  | 2,046 | 644,389 | (20) | 627,883 | (17,230)
Common stock, shares outstanding at Jun. 30, 2018 |  | 20,460,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 31,000 |  |  |  |  |
Stock Issued During Period, Value, New Issues | 1,674 |  | 3 | 1,130 | 541 |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  | (2,000) |  |  |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | (649) |  |  |  | (649) |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 6,233 |  |  | 6,233 |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | (4,231) |  |  |  |  |  | (4,231)
Net Income (Loss) Attributable to Parent | 219 |  |  |  |  | 219 |
Stockholders' Equity Attributable to Parent at Sep. 30, 2018 | $ 1,260,314 |  | 2,049 | 651,752 | (128) | 628,102 | (21,461)
Common stock, shares outstanding at Sep. 30, 2018 |  | 20,489,000 |  |  |  |  |
Common stock, shares outstanding at Dec. 31, 2018 | 20,491,000 | 20,492,000 |  |  |  |  |
Stockholders' Equity Attributable to Parent at Dec. 31, 2018 | $ 1,263,655 |  | 2,049 | 657,899 | (95) | 620,747 | (16,945)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 254,000 |  |  |  |  |
Stock Issued During Period, Value, New Issues | 925 |  | 18 |  | 5,196 |  |
Adjustments to Additional Paid in Capital, Other |  |  |  | (4,289) |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  | (78,000) |  |  |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | (18,157) |  |  |  | (18,157) |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 6,209 |  |  | 6,209 |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | (936) |  |  |  |  |  | (936)
Net Income (Loss) Attributable to Parent | 30,998 |  |  |  |  | 30,998 |
Stockholders' Equity Attributable to Parent at Mar. 31, 2019 | $ 1,282,694 |  | 2,067 | 659,819 | (13,056) | 651,745 | (17,881)
Common stock, shares outstanding at Mar. 31, 2019 |  | 20,668,000 |  |  |  |  |
Common stock, shares outstanding at Dec. 31, 2018 | 20,491,000 | 20,492,000 |  |  |  |  |
Stockholders' Equity Attributable to Parent at Dec. 31, 2018 | $ 1,263,655 |  | 2,049 | 657,899 | (95) | 620,747 | (16,945)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation | (79,313) |  |  |  |  |  |
Stockholders' Equity Attributable to Parent at Sep. 30, 2019 | $ 1,340,335 |  | 2,067 | 659,709 | 0 | 701,141 | (22,582)
Common stock, shares outstanding at Sep. 30, 2019 | 20,671,000 | 20,671,000 |  |  |  |  |
Common stock, shares outstanding at Mar. 31, 2019 |  | 20,668,000 |  |  |  |  |
Stockholders' Equity Attributable to Parent at Mar. 31, 2019 | $ 1,282,694 |  | 2,067 | 659,819 | (13,056) | 651,745 | (17,881)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 0 |  |  |  |  |
Stock Issued During Period, Value, New Issues | 3,009 |  | 0 |  | 11,514 |  |
Adjustments to Additional Paid in Capital, Other |  |  |  | (8,505) |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  | 0 |  |  |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | (108) |  |  |  | (108) |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 6,229 |  |  | 6,229 |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | 3,207 |  |  |  |  |  | 3,207
Net Income (Loss) Attributable to Parent | 22,833 |  |  |  |  | 22,833 |
Stockholders' Equity Attributable to Parent at Jun. 30, 2019 | 1,317,864 |  | 2,067 | 657,543 | (1,650) | 674,578 | (14,674)
Common stock, shares outstanding at Jun. 30, 2019 |  | 20,668,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 4,000 |  |  |  |  |
Stock Issued During Period, Value, New Issues | 307 |  | 0 |  | 1,863 |  |
Adjustments to Additional Paid in Capital, Other |  |  |  | (1,556) |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  | (1,000) |  |  |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | (213) |  |  |  | (213) |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 3,722 |  |  | 3,722 |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | (7,908) |  |  |  |  |  | (7,908)
Net Income (Loss) Attributable to Parent | 26,563 |  |  |  |  | 26,563 |
Stockholders' Equity Attributable to Parent at Sep. 30, 2019 | $ 1,340,335 |  | $ 2,067 | $ 659,709 | $ 0 | $ 701,141 | $ (22,582)
Common stock, shares outstanding at Sep. 30, 2019 | 20,671,000 | 20,671,000 |  |  |  |  |

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