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Consolidated Statements Of Shareholders' Equity - USD ($) | Common Stock [Member] | Additional Paid In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Treasury Stock [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ 292,000 | $ 135,227,000 | $ 22,768,000 | $ (121,000) | $ (9,481,000) | $ 148,685,000
Balance, shares at Dec. 31, 2014 | 29,229,000 |  |  |  | (1,101,000) |
Net income |  |  | 4,005,000 |  |  | 4,005,000
Foreign currency translation gain (loss) |  |  |  | 45,000 |  | 45,000
Comprehensive income |  |  |  |  |  | 4,050,000
Cash dividends paid |  |  | (3,408,000) |  |  | (3,408,000)
Equity compensation | $ 3,000 | 5,323,000 |  |  |  | 5,326,000
Equity compensation, shares | 271,000 |  |  |  |  |
Exercise of options | $ 2,000 | 1,837,000 |  |  | $ (1,002,000) | 837,000
Exercise of options, shares | 248,000 |  |  |  | (93,000) |
Employee stock purchase plan | $ 1,000 | 688,000 |  |  |  | $ 689,000
Employee stock purchase plan, shares | 78,000 |  |  |  |  | 78,000
Excess tax benefit/shortfall |  | 458,000 |  |  |  | $ 458,000
Redemption and repurchase of stock to cover tax withholdings |  | (645,000) |  |  | $ (741,000) | (1,386,000)
Redemption and repurchase of stock to cover tax withholdings, shares | (60,000) |  |  |  | (71,000) |
Balance at Dec. 31, 2015 | $ 298,000 | 142,888,000 | 23,365,000 | (76,000) | $ (11,224,000) | 155,251,000
Balance, shares at Dec. 31, 2015 | 29,766,000 |  |  |  | (1,265,000) |
Net income |  |  | 10,778,000 |  |  | 10,778,000
Foreign currency translation gain (loss) |  |  |  | (353,000) |  | (353,000)
Comprehensive income |  |  |  |  |  | 10,425,000
Equity compensation | $ 3,000 | 6,599,000 |  |  |  | 6,602,000
Equity compensation, shares | 342,000 |  |  |  |  |
Exercise of options | $ 3,000 | 2,083,000 |  |  | $ (712,000) | 1,374,000
Exercise of options, shares | 372,000 |  |  |  | (69,000) |
Employee stock purchase plan | $ 1,000 | 828,000 |  |  |  | $ 829,000
Employee stock purchase plan, shares | 90,000 |  |  |  |  | 90,000
Excess tax benefit/shortfall |  | 606,000 |  |  |  | $ 606,000
Redemption and repurchase of stock to cover tax withholdings |  | (499,000) |  |  | $ (198,000) | (697,000)
Redemption and repurchase of stock to cover tax withholdings, shares | (44,000) |  |  |  | (22,000) |
Stock issued during period, Acquisition | $ 37,000 | 34,556,000 |  |  |  | 34,593,000
Stock issued during period, Shares, Acquisition | 3,704,000 |  |  |  |  |
Balance at Dec. 31, 2016 | $ 342,000 | 187,061,000 | 34,143,000 | (429,000) | $ (12,134,000) | 208,983,000
Balance, shares at Dec. 31, 2016 | 34,230,000 |  |  |  | (1,356,000) |
Net income |  |  | 3,704,000 |  |  | 3,704,000
Foreign currency translation gain (loss) |  |  |  | 2,286,000 |  | 2,286,000
Comprehensive income |  |  |  |  |  | 5,990,000
Equity compensation | $ 3,000 | 7,310,000 |  |  |  | 7,313,000
Equity compensation, shares | 311,000 |  |  |  |  |
Exercise of options | $ 4,000 | 2,476,000 |  |  | $ (585,000) | 1,895,000
Exercise of options, shares | 393,000 |  |  |  | (30,000) |
Employee stock purchase plan | $ 1,000 | 1,230,000 |  |  |  | $ 1,231,000
Employee stock purchase plan, shares | 93,000 |  |  |  |  | 93,000
Redemption and repurchase of stock to cover tax withholdings | $ (1,000) | (1,613,000) |  |  |  | $ (1,614,000)
Redemption and repurchase of stock to cover tax withholdings, shares | (92,000) |  |  |  |  |
Stock issued during period, Acquisition | $ 27,000 | 53,092,000 |  |  |  | 53,119,000
Stock issued during period, Shares, Acquisition | 2,683,000 |  |  |  |  |
Balance at Dec. 31, 2017 | $ 376,000 | 249,935,000 | 37,609,000 | 1,857,000 | $ (12,719,000) | 277,058,000
Balance, shares at Dec. 31, 2017 | 37,618,000 |  |  |  | (1,386,000) |
Cumulative effect of ASU 2016-09 Adjustment | ASU 2016-09 [Member] |  | $ 379,000 | $ (238,000) |  |  | $ 141,000

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