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Consolidated Statement of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Loss | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance, shares at Dec. 31, 2017 |  | 32,332 |  |  |  | 615
Balance, value at Dec. 31, 2017 | $ 531,719 | $ 323 | $ 271,957 | $ 274,562 | $ (4,366) | $ (10,757)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 8,352 |  |  | 8,352 |  |
Foreign currency translation adjustment | 110 |  |  |  | 110 |
Minimum pension and post retirement benefit plan adjustments, net of taxes of $4 | 27 |  |  |  | 27 |
Stock compensation expense | 2,097 |  | 2,097 |  |  |
Stock options exercised, shares |  | 13 |  |  |  |
Stock options exercised | 226 |  | 226 |  |  |
Net settlement of restricted stock units, shares |  | 53 |  |  |  | 24
Net settlement of restricted stock units | (850) | $ 1 | (1) |  |  | $ (850)
Balance, shares at Mar. 31, 2018 |  | 32,398 |  |  |  | 639
Balance, value at Mar. 31, 2018 | 541,955 | $ 324 | 274,279 | 283,538 | (4,579) | $ (11,607)
Balance, shares at Dec. 31, 2017 |  | 32,332 |  |  |  | 615
Balance, value at Dec. 31, 2017 | 531,719 | $ 323 | 271,957 | 274,562 | (4,366) | $ (10,757)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 50,692 |  |  |  |  |
Foreign currency translation adjustment | (1,538) |  |  |  |  |
Balance, shares at Sep. 30, 2018 |  | 32,842 |  |  |  | 778
Balance, value at Sep. 30, 2018 | 582,875 | $ 328 | 280,149 | 325,878 | (6,174) | $ (17,306)
Balance, shares at Mar. 31, 2018 |  | 32,398 |  |  |  | 639
Balance, value at Mar. 31, 2018 | 541,955 | $ 324 | 274,279 | 283,538 | (4,579) | $ (11,607)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 22,837 |  |  | 22,837 |  |
Foreign currency translation adjustment | (1,787) |  |  |  | (1,787) |
Minimum pension and post retirement benefit plan adjustments, net of taxes of $4 | 26 |  |  |  | 26 |
Stock compensation expense | 2,731 |  | 2,731 |  |  |
Stock options exercised, shares |  | 21 |  |  |  |
Stock options exercised | 300 |  | 300 |  |  |
Awards of common shares (in shares) |  | 2 |  |  |  |
Net settlement of restricted stock units, shares |  | 334 |  |  |  | 128
Net settlement of restricted stock units | (5,166) | $ 3 | (3) |  |  | $ (5,166)
Balance, shares at Jun. 30, 2018 |  | 32,755 |  |  |  | 767
Balance, value at Jun. 30, 2018 | 560,896 | $ 327 | 277,307 | 306,375 | (6,340) | $ (16,773)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 19,503 |  |  | 19,503 |  |
Foreign currency translation adjustment | 139 |  |  |  | 139 |
Minimum pension and post retirement benefit plan adjustments, net of taxes of $4 | 27 |  |  |  | 27 |
Stock compensation expense | 2,026 |  | 2,026 |  |  |
Stock options exercised, shares |  | 50 |  |  |  |
Stock options exercised | 817 | $ 1 | 816 |  |  |
Net settlement of restricted stock units, shares |  | 37 |  |  |  | 11
Net settlement of restricted stock units | (533) |  |  |  |  | $ (533)
Balance, shares at Sep. 30, 2018 |  | 32,842 |  |  |  | 778
Balance, value at Sep. 30, 2018 | 582,875 | $ 328 | 280,149 | 325,878 | (6,174) | $ (17,306)
Balance, shares at Dec. 31, 2018 |  | 32,887 |  |  |  | 796
Balance, value at Dec. 31, 2018 | 596,693 | $ 329 | 282,525 | 338,995 | (7,234) | $ (17,922)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 6,345 |  |  | 6,345 |  |
Foreign currency translation adjustment | 842 |  |  |  | 842 |
Minimum pension and post retirement benefit plan adjustments, net of taxes of $4 | 12 |  |  |  | 12 |
Stock compensation expense | 2,371 |  | 2,371 |  |  |
Stock options exercised, shares |  | 12 |  |  |  |
Stock options exercised | 139 |  | 139 |  |  |
Net settlement of restricted stock units, shares |  | 127 |  |  |  | 59
Net settlement of restricted stock units | (2,151) | $ 1 | (1) |  |  | $ (2,151)
Balance, shares at Mar. 31, 2019 |  | 33,026 |  |  |  | 855
Balance, value at Mar. 31, 2019 | 605,833 | $ 330 | 285,034 | 346,922 | (6,380) | $ (20,073)
Balance, shares at Dec. 31, 2018 |  | 32,887 |  |  |  | 796
Balance, value at Dec. 31, 2018 | 596,693 | $ 329 | 282,525 | 338,995 | (7,234) | $ (17,922)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 50,734 |  |  |  |  |
Foreign currency translation adjustment | 1,176 |  |  |  |  |
Balance, shares at Sep. 30, 2019 |  | 33,145 |  |  |  | 888
Balance, value at Sep. 30, 2019 | 657,213 | $ 332 | 293,009 | 391,311 | (6,022) | $ (21,417)
Balance, shares at Mar. 31, 2019 |  | 33,026 |  |  |  | 855
Balance, value at Mar. 31, 2019 | 605,833 | $ 330 | 285,034 | 346,922 | (6,380) | $ (20,073)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 19,913 |  |  | 19,913 |  |
Foreign currency translation adjustment | 998 |  |  |  | 998 |
Minimum pension and post retirement benefit plan adjustments, net of taxes of $4 | 12 |  |  |  | 12 |
Stock compensation expense | 3,720 |  | 3,720 |  |  |
Stock options exercised, shares |  | 5 |  |  |  |
Stock options exercised | 69 |  | 69 |  |  |
Awards of common shares (in shares) |  | 8 |  |  |  |
Net settlement of restricted stock units, shares |  | 62 |  |  |  | 25
Net settlement of restricted stock units | (998) | $ 1 | (1) |  |  | $ (998)
Balance, shares at Jun. 30, 2019 |  | 33,101 |  |  |  | 880
Balance, value at Jun. 30, 2019 | 629,547 | $ 331 | 288,822 | 366,835 | (5,370) | $ (21,071)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 24,476 |  |  | 24,476 |  |
Foreign currency translation adjustment | (664) |  |  |  | (664) |
Minimum pension and post retirement benefit plan adjustments, net of taxes of $4 | 12 |  |  |  | 12 |
Stock compensation expense | 3,996 |  | 3,996 |  |  |
Stock options exercised, shares |  | 16 |  |  |  |
Stock options exercised | 192 |  | 192 |  |  |
Net settlement of restricted stock units, shares |  | 28 |  |  |  | 8
Net settlement of restricted stock units | (346) | $ 1 | (1) |  |  | $ (346)
Balance, shares at Sep. 30, 2019 |  | 33,145 |  |  |  | 888
Balance, value at Sep. 30, 2019 | $ 657,213 | $ 332 | $ 293,009 | $ 391,311 | $ (6,022) | $ (21,417)

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