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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital | Retained Earnings
--- | --- | --- | --- | ---
Balance at Dec. 31, 2013 | $ 435,865 | $ 305 | $ 107,726 | $ 327,834
Balance, shares (in shares) at Dec. 31, 2013 |  | 30,522,000 |  |
Net and comprehensive income | 61,169 |  |  | 61,169
Exercise of stock options | 13,235 | $ 5 | 13,230 |
Exercise of stock options (in shares) |  | 469,000 |  |
Common stock issued under employee stock purchase plan | 354 |  | 354 |
Common stock issued under employee stock purchase plan (in shares) |  | 9,000 |  |
Share-based compensation | 6,681 |  | 6,681 |
Dividends | (14,795) |  | (9) | 14,804
Cash settlement of share-based awards for minimum tax withholdings | (1,083) |  |  | (1,083)
Cash settlement of share-based awards for minimum tax withholdings (in shares) |  | (25,000) |  |
Stock repurchases | (39,972) | $ (9) |  | (39,963)
Stock repurchases, shares |  | (882,000) |  |
Vesting of previously non-vested shares |  | $ 2 | (2) |
Vesting of previously non-vested shares (in shares) |  | 162,000 |  |
Tax benefit for stock options exercised | 2,109 |  | 2,109 |
Balance at Dec. 31, 2014 | 463,563 | $ 303 | 130,107 | 333,153
Balance, shares (in shares) at Dec. 31, 2014 |  | 30,255,000 |  |
Net and comprehensive income | 55,575 |  |  | 55,575
Exercise of stock options | 14,313 | $ 6 | 17,394 | (3,087)
Exercise of stock options (in shares) |  | 605,000 |  |
Common stock issued under employee stock purchase plan | 449 |  | 449 |
Common stock issued under employee stock purchase plan (in shares) |  | 11,000 |  |
Share-based compensation | 7,486 |  | 7,486 |
Dividends | (14,821) |  | (7) | 14,828
Cash settlement of share-based awards for minimum tax withholdings | (1,931) |  |  | (1,931)
Cash settlement of share-based awards for minimum tax withholdings (in shares) |  | (38,000) |  |
Stock repurchases | (19,992) | $ (5) |  | (19,987)
Stock repurchases, shares |  | (423,000) |  |
Vesting of previously non-vested shares |  | $ 1 | (1) |
Vesting of previously non-vested shares (in shares) |  | 134,000 |  |
Tax benefit for stock options exercised | 5,413 |  | 5,413 |
Balance at Dec. 31, 2015 | $ 510,055 | $ 305 | 160,855 | 348,895
Balance, shares (in shares) at Dec. 31, 2015 | 30,543,864 | 30,544,000 |  |
Net and comprehensive income | $ 27,670 |  |  | 27,670
Exercise of stock options | 8,148 | $ 3 | 8,145 |
Exercise of stock options (in shares) |  | 346,000 |  |
Common stock issued under employee stock purchase plan | 442 |  | 442 |
Common stock issued under employee stock purchase plan (in shares) |  | 11,000 |  |
Share-based compensation | 8,334 |  | 8,334 |
Dividends | (15,529) |  | (6) | 15,535
Cash settlement of share-based awards for minimum tax withholdings | (1,800) |  |  | (1,800)
Cash settlement of share-based awards for minimum tax withholdings (in shares) |  | (42,000) |  |
Stock repurchases | (39,983) | $ (9) |  | (39,974)
Stock repurchases, shares |  | (910,000) |  |
Vesting of previously non-vested shares |  | $ 2 | (2) |
Vesting of previously non-vested shares (in shares) |  | 141,000 |  |
Tax benefit for stock options exercised | 1,732 |  | 1,732 |
Balance at Dec. 31, 2016 | $ 499,069 | $ 301 | $ 179,512 | $ 319,256
Balance, shares (in shares) at Dec. 31, 2016 | 30,090,335 | 30,090,000 |  |

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