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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital | Retained Earnings | Previously Reported [Member] | Previously Reported [Member] Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Cumulative Effect of New Accounting Standard | $ (558) |  |  | $ (558) |  |
Balance at Dec. 31, 2015 | 509,497 | $ 305 | $ 160,855 | 348,337 | $ 510,055 | $ 348,895
Balance, shares (in shares) at Dec. 31, 2015 |  | 30,544,000 |  |  |  |
Net and comprehensive income (as adjusted) | 27,505 |  |  | 27,505 |  |
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 | 498,346 | $ 301 | 179,512 | 318,533 |  |
Balance, shares (in shares) at Dec. 31, 2016 |  | 30,090,000 |  |  |  |
Net and comprehensive income (as adjusted) | 87,255 |  |  | 87,255 |  |
Exercise of stock options | 7,272 | $ 2 | 7,270 |  |  |
Exercise of stock options (in shares) |  | 206,000 |  |  |  |
Conversion of Stock, Shares Issued |  | 10,000 |  |  |  |
Common stock issued under employee stock purchase plan | 458 |  | 458 |  |  |
Common stock issued under employee stock purchase plan (in shares) |  | 10,000 |  |  |  |
Share-based compensation | 8,103 |  | 8,103 |  |  |
Dividends | (18,052) |  | 4 | (18,056) |  |
Cash settlement of share-based awards for minimum tax withholdings | (1,700) |  |  | (1,700) |  |
Cash settlement of share-based awards for minimum tax withholdings (in shares) |  | (35,000) |  |  |  |
Stock repurchases | (48,983) | $ (9) |  | (48,974) |  |
Stock repurchases, shares |  | (948,000) |  |  |  |
Vesting of previously non-vested shares |  | $ 1 | (1) |  |  |
Vesting of previously non-vested shares (in shares) |  | 121,000 |  |  |  |
Balance at Dec. 31, 2017 | $ 532,699 | $ 295 | 195,346 | 337,058 |  |
Balance, shares (in shares) at Dec. 31, 2017 | 29,454,062 | 29,454,000 |  |  |  |
Net and comprehensive income (as adjusted) | $ 92,051 |  |  | 92,051 |  |
Exercise of stock options | 3,921 | $ 1 | 3,920 |  |  |
Exercise of stock options (in shares) |  | 95,000 |  |  |  |
Other | (30) | $ 0 |  | (30) |  |
Common stock issued under employee stock purchase plan | 479 |  | 479 |  |  |
Common stock issued under employee stock purchase plan (in shares) |  | 9,000 |  |  |  |
Share-based compensation | 10,549 |  | 10,549 |  |  |
Dividends | (18,427) |  | 3 | (18,430) |  |
Cash settlement of share-based awards for minimum tax withholdings | (1,872) | $ (1) |  | (1,871) |  |
Cash settlement of share-based awards for minimum tax withholdings (in shares) |  | (33,000) |  |  |  |
Stock repurchases | (66,126) | $ (11) |  | (66,115) |  |
Stock repurchases, shares |  | (1,109,000) |  |  |  |
Vesting of previously non-vested shares |  | $ 1 | (1) |  |  |
Vesting of previously non-vested shares (in shares) |  | 119,000 |  |  |  |
Balance at Dec. 31, 2018 | $ 553,244 | $ 285 | $ 210,296 | $ 342,663 |  |
Balance, shares (in shares) at Dec. 31, 2018 | 28,534,935 | 28,535,000 |  |  |  |

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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy. + References No definition available. + Details
Name: | us-gaap_StockholdersEquityOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration